陆新征的共享空间: Blog

新上载论文：钢板筒仓侧壁压力的非线性有限元分析

Wed, 20 Aug 2008 04:03:29 GMT

张炎圣杨晓蒙陆新征
工业建筑, 2008, 38(sup.), 447-451.

摘要：钢板筒仓已有超过70年的使用历史。Janssen公式的提出，使钢板筒仓的设计有了理论基础，但难以适应各种复杂的筒仓结构和形状。本文基于大型有限元软件MSC.MARC，通过借助MARC提供的用户自定义材料功能，开发了关联流动和非关联流动弹塑性本构模型，利用MARC自带的接触功能，对筒仓侧壁的应力进行了分析，并将结果与Janssen公式进行了对比。分析结果表明，非线性有限元计算可以准确获得筒仓侧壁的压力分布且具有较好的灵活性。
关键词：Janssen公式弹性理论关联流动塑性非关联流动塑性

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Nonlinear finite element analysis for the wall pressure in a steel silo

Zhang Yan-sheng Yang Xiao-meng Lu Xin-zheng
Industrial Structure, 2008, 38(sup.), 447-451.

Abstract: It has been 70 years since people started using steel silos for the storage of grain. The proposal of Janssen’s Formula makes a theoretical foundation for the study of steel silos, but it is difficult to adapt the formula to complex silo structures and shapes. This paper is based on finite element software MSC.MARC. By using user-defined material function provided by MARC, associated and non-associated flow of elastic-plasticity constitutive models are developed. Wall stress of the silo is analyzed by the contact function in MARC, and the results are compared with Janssen’s Formula. The results show that the non-linear finite element calculation can be accurate to the silo wall pressure distribution and of better flexibility.
Key words: Janssen’s Formula, elastic theory, associated plastic flow, non-associated plastic flow

新上载论文：结构抗连续倒塌的拉接强度设计方法

Mon, 04 Aug 2008 05:18:23 GMT

结构抗连续倒塌的拉接强度设计方法

李易1,2，陆新征1,2，叶列平1,2，马一飞1,2，梁益1,2
第十届全国混凝土结构基本理论及工程应用学术会议, 2008.8.1~4, 大连: 391-396.

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摘要：拉结强度法是国外抗连续倒塌设计规范采用的主要设计方法之一，我国还没有这方面的相关研究。拉结强度法通过假设破坏模式，将超静定结构在局部转化为静定结构进行分析，从而对结构的拉结强度进行验算和设计。该方法无需对整个结构进行受力分析，比较简便易行，是一种适合工程设计的设计方法。但由于其计算模型过于简化，设计参数的经验性成分较多，其可靠性和适用性需要进一步的检验。本文总结了国外抗连续倒塌设计规范的拉结强度法的概念和条文，通过有限元数值仿真证明了国外拉结强度法不能明显提高我国混凝土框架结构抗连续倒塌能力的结论。最后，本文对国外拉结强度法的基本拉结强度的计算原理进行了分析，指出了该方法计算模型的不足，建议对该方法进行改进使之能够适应我国混凝土框架结构的抗连续倒塌设计。
关键词：混凝土框架结构，连续倒塌，规范设计方法，拉结强度法
中图分类号：TU375.4 文献标识码：A

Tie force method for progressive collapse resistance of structures

Li Yi1,2，Lu Xinzheng1,2，Ye Lieping1,2，Ma Yifei1,2，Liang Yi1,2
Proc. 10th National Conference on fundamental theory and engineering application of concrete

Abstract：Tie force (TF) method is one of the major design methods proposed by foreign codes to resist progressive collapse, but the related researches are still lack in China. TF method is convenient to implement because it does not need to calculate the response of the whole structure. However, as too many assumptions have been set to build up this method, the empirical factors are needed to be carefully checked to guarantee the safety of the TF design. This paper summarized the conceptions and specifications of TF methods in foreign codes. Then foreign TF methods were proved to be not safety for Chinese concrete frames with nonlinear finite element dynamic analysis. In order to explain this phenomenon, the drawbacks in foreign TF methods were pointed out from the discussion of the fundamental principles of TF methods. And the suggestions from these discussions will be helpful to setup a feasible TF method in China.
Keywords: concrete frame structures；progressive collapse; design codes; tie force method

新上载论文：混凝土结构抗震非线性分析模型、方法及算例

Mon, 28 Jul 2008 05:34:10 GMT

混凝土结构抗震非线性分析模型、方法及算例

叶列平陆新征马千里汪训流缪志伟

工程力学/Engineering Mechanics, 2006, 23(sup. II). 131-140.

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摘要：结构在大震作用下会进入非线性并产生损伤，准确预测地震荷载下钢筋混凝土结构的非线性行为，对评估混凝土结构的抗震安全性具有重要意义。本文介绍了清华大学土木工程系近年来开发的适用于钢筋混凝土杆系结构的纤维模型THUFIBER程序，适用于预应力混凝土杆系结构的纤维模型NAT-PPC程序，以及适用于剪力墙结构的分层壳墙元模型的非线性分析程序。这些程序可以直接将构件的非线性节点力（轴力、剪力和弯矩）、节点变形（平动和转动）和材料的非线性应力-应变行为联系起来，可以模拟各种复杂受力构件的滞回行为和轴力－双向弯曲－剪切耦合行为，借助通用有限元程序方便的前后处理功能和非线性计算功能，该程序可以准确模拟地震作用下结构的三维非线性地震响应，也可模拟爆炸、倒塌等极端非线性行为。本文通过一系列的数值分析与试验结果的对比和工程应用算例，说明所研发程序的精度和计算能力。

关键词：钢筋混凝土，地震，非线性，杆件，纤维模型，剪力墙，分层壳单元

Seismic nonlinear analytical models, methods and examples for concrete structures

Ye Lieping, Lu Xinzheng, Ma Qianli, Wang Xunliu, Miao Zhiwei

Engineering Mechanics, 2006, 23(sup. II). 131-140.

Abstract: Structures will enter nonlinear stage in strong earthquake, precisely prediction for the nonlinear behavior of reinforced concrete (RC) structures in earthquake is important to assess the aseismic safety of the structures. This paper presents the programs recently developed by the Civil Engineering Department of Tsinghua University, which include the fiber model based the program THUFIBER for RC frames, the program NAT-PPC for prestressed concrete (PC) frames, and multi-layer shell element based shear wall program. These programs can connect the nonlinear nodal force/nodal displacement relationship of elements directly with the nonlinear stress/strain relationship of materials. So complicated cycle behaviors and coupled axial force-biaixal bending-shear behaviors of the RC structures can be correctly simulated. And furthermore, with the convenient pre/post process and nonlinear capacity of common finite element software, these programs not only can precisely simulate the spatial structural nonlinear seismic response, but also can simulate some extreme nonlinear problems such as blast or collapse. The precision and the capacity of the programs are illustrated in this paper with a series of researches and applications.

Keywords: reinforced concrete, seismic, nonlinear, fiber model, shear wall, multi-layer shell

新上载论文：某钢框架偏心核心筒弹塑性分析

Tue, 15 Jul 2008 02:54:24 GMT

某钢框架偏心核心筒弹塑性分析

缪志伟陆新征王载黄盛楠叶列平

四川建筑科学研究, 2008, 34(3): 5-10.

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摘要：结构在大震作用下会进入弹塑性并产生损伤，准确预测地震荷载下结构的非线性行为，对评估结构的抗震安全性具有重要意义。本文总结了现有的一些结构弹塑性分析模型，并介绍了清华大学土木工程系近年来以通用有限元程序MSC.Marc为平台所开发的一些新的结构弹塑性分析模型。这些模型可以直接将构件的非线性节点力（轴力、剪力和弯矩）、节点变形（平动和转动）和材料的非线性应力-应变行为联系起来，可以模拟各种复杂受力构件的滞回行为和轴力－双向弯曲－剪切耦合行为。同时，借助通用有限元程序方便的前后处理功能和非线性计算功能，这些模型可以准确模拟地震作用下结构的三维非线性地震响应。利用这些工具，本文对一个实际工程结构进行了静力弹塑性分析和动力弹塑性时程分析，表明这些分析模型可以较好的模拟实际工程结构中的各种弹塑性行为，供科研和工程人员参考。

关键词：弹塑性分析，结构非线性，地震，纤维模型，剪力墙，分层壳单元

Elasto-plastic Analysis for A Steel Frame-Core Wall Structure with An Eccentric Tube

Miao Zhiwei, Lu Xinzheng, Wang Zai, Huang Shengnan, Ye Lieping

Sichuan Building Science, 2008, 34(3): 5-10.

Abstract: Structures will enter nonlinear stage during strong earthquakes. Hence accurate prediction for the structural nonlinear behaviors is important to the safety and loss assessment during earthquakes. This paper reviews the existed nonlinear analytic models for structures and presents some novel models for structural nonlinear analysis that recently developed by the Tsinghua University. With these models, the material stress-strain relationship can be connected directly with the force-displacement behavior of the structural elements. So that the complicated coupled axial force-bending moment-shear force behaviors can be properly simulated, as well as the corresponding cycle behaviors. With the secondary development user subroutines, convenient pre and post process functions and extinct nonlinear capacity of general purpose FE software of MSC.MARC, the spatial seismic responds of structures can be precisely simulated. A steel frame-core wall structure with an eccentric tube is analyzed with static pushover and dynamic time-history analysis to demonstrate the applications of the new models.

Keywords: nonlinear analysis, structure, seismic, fiber model, shear wall, multi-layer shell

新上载论文：论结构抗震的鲁棒性

Thu, 03 Jul 2008 12:03:10 GMT

论结构抗震的鲁棒性
叶列平，程光煜，陆新征，冯鹏

建筑结构, 2008, 38(6): 11-15.

摘要：本文首先介绍了结构鲁棒性的概念，及其提高结构鲁棒性对避免结构在罕遇地震下垮塌的重要意义。然后，分别从抗震结构体系、结构承载力与延性、结构破坏模式，以及赘余构件等几方面讨论了提高结构抗震鲁棒性的措施。
关键词：结构抗震，鲁棒性，结构体系，整体性，破坏模式，结构承载力，结构延性，赘余构件

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Introduction of Robustness for Seismic Structures
Ye Lieping, Cheng Guangyu, Lu Xinzheng, Feng Peng

Building Structures, 2008, 38(6): 11-15.

Abstract:The concept of robustness of structures is firstly introduced in this paper. And importance with enough robustness for seismic structures in preventing collapse of the structures under strong intensity earthquake attack is discussed. Then the approaches to increase the robustness of seismic structures, including structural systems, strength and ductility of structure, failure modes and redundancy, are suggested.
Keywords: seismic structure; robustness; structural systems; integrity; failure mode; strength; ductility; redundancy elements.

汶川地震建筑震害分析与重建研讨会

Wed, 02 Jul 2008 02:06:53 GMT

在工程院等相关部门的支持下，全国建筑抗震领域的100多名专家在中国工程院召开了“汶川地震建筑震害分析与重建研讨会”。把我们灾后完成的一些工作在这里简要介绍一下吧。

汶川地震建筑震害分析, 清华大学土木结构组, 西南交通大学土木结构组, 北京交通大学土木结构组, 汶川地震建筑震害分析与重建研讨会论文集, 2008.6, 北京

砌体结构的地震倒塌模拟与分析, 林旭川, 陆新征, 叶列平, 汶川地震建筑震害分析与重建研讨会论文集, 2008.6, 北京

现浇楼板对框架结构柱梁强度比的影响研究, 马千里, 叶列平, 陆新征, 马玉虎, 汶川地震建筑震害分析与重建研讨会论文集, 2008.6, 北京

填充墙震害数值模拟与对策讨论, 张炎圣, 马千里, 陆新征, 叶列平, 汶川地震建筑震害分析与重建研讨会论文集, 2008.6, 北京

出屋面结构震害分析与设计建议, 缪志伟, 陆新征, 叶列平, 汶川地震建筑震害分析与重建研讨会论文集, 2008.6, 北京

建筑结构的抗倒塌能力——汶川地震建筑震害的教训, 叶列平, 曲哲, 陆新征, 汶川地震建筑震害分析与重建研讨会论文集, 2008.6, 北京

新上载论文：核爆冲击波作用下空心砌块墙对主体结构的作用

Sun, 22 Jun 2008 08:11:51 GMT

核爆冲击波作用下空心砌块墙对主体结构的作用
张正威，宋二祥，陆新征，陈肇元

工程力学/Engineering Mechanics, 2008, 25(5): 73-78.

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摘要：该文采用显式动力有限元软件LS-DYNA 对核爆冲击波作用下高层建筑混凝土小型空心砌块外墙(以下简称砌块墙)的破坏模式进行了数值模拟，计算模型考虑了材料非线性、接触非线性、大应变、大变形等主要特征。在此基础上讨论了砌块墙在破坏飞散过程中传给结构的荷载，得到了不同冲击波超压作用下砌块墙传给结构的荷载时程。计算结果表明：核爆冲击波作用下，砌块墙的破坏模式与冲击波超压的大小有关；其传给结构的荷载时程基本呈三角形分布，荷载峰值随超压的增加而增大，墙体顶部与结构构件之间接触面的允许抗剪强度对荷载峰值时间和持续作用时间起关键作用。
关键词：核爆冲击波；空心砌块墙；高层建筑；作用；有限元分析

EFFECTS OF CONCRETE MASONRY WALLS ON STRUCTURES UNDER NUCLEAR BLAST LOADINGS
ZHANG Zheng-wei, SONG Er-xiang , LU Xin-zheng, CHEN Zhao-yuan

Engineering Mechanics, 2008, 25(5): 73-78.

Abstract: Concrete masonry walls subjected to blast loadings were analyzed with the explicit dynamic finite element method. The nonlinear material properties, nonlinear contact, large strain, large displacement were considered in the analysis model. The effects on high rise building caused by masonry wall deformation and failure under blast loadings were discussed. The loading time history on high rise building caused by masonry wall failure is presented. The numerical results show the mode of failure of masonry walls is significantly influenced by the strength of blast wave. The induced forces of structures are of triangle pattern, the larger the strength of blast wave, the higher the peak value of forces . The critical shear strength of mortar between masonry wall and the structural members played an important role on the moment of peak forces and the duration of forces.
Key words: nuclear blast wave; concrete masonry wall; high rise building; effect; FEM

新上载论文：采用逐步增量弹塑性时程方法对RC框架结构推覆分析侧力模式的研究

Thu, 05 Jun 2008 02:07:40 GMT

采用逐步增量弹塑性时程方法对RC框架结构推覆分析侧力模式的研究

马千里, 叶列平, 陆新征, 缪志伟
建筑结构学报, 2008, 29(2): 132-140.

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摘要:以两个普通六层和十层钢筋混凝土框架结构为例,采用基于纤维模型的逐步增量弹塑性时程方法得到的层间剪力-位移关系曲线,与不同侧力模式的推覆分析结果进行了对比,研究了推覆分析结果的可靠程度。通过与不同场地的大量地震记录的弹塑性时程计算结果进行比较分析,建议采用多种合理的侧力模式进行推覆分析,对结构不同楼层的抗震性能进行全面的评价,即均布侧力模式适合于底部楼层的评价;考虑高度影响分布力模式适合于结构中部楼层的评价;而对结构上部楼层特别是顶层,可以采用SRSS侧力模式或规范侧力模式进行评价。分析研究表明,采用本文建议的侧力模式进行推覆分析,可在统计意义上可对钢筋混凝土规则框架结构的抗震能力作出偏于安全的估计。
关键词:钢筋混凝土框架结构; 纤维模型; 推覆分析; 逐步增量弹塑性时程分析; 层间剪力-位移关系

Study on lateral load patterns of pushover analysis using incremental dynamical analysis for RC frame structures

Ma QL, Ye LP, Lu XZ, Miao ZW
Journal of Building Structures, 2008, 29(2): 132-140.

Abstract: In this research, the nonlinear static p rocedures with different lateral load patterns were compared by using incremental dynamical analysismethod based on a six2storey and a ten2storey RC frame fibermodel. For each story of different frames, the inter2story shear force vs. drift curves computed by pushover analysis by using different lateral load patterns and time history analysis with a series of earthquake records on the design site have been compared to give a rational lateral load pattern of pushover analysis. Finally, for a whole frame structure, the lateral load pattern choice was suggested, that is, uniform load pattern was better for the stories near foundation; load pattern with the story heights taken into consideration was suitable for the mid stories and the SRSS pattern or Chinese Code pattern was suitable for upper stories. It is also shown that the nonlinear static p rocedure gives a safe estimation of the inelastic seismic response statistically for regular RC frames with good numerical stability.
Keywords: RC frame; fiber model; pushover analysis; incremental dynamic analysis; inter-storey shear force and drift relation

新上载论文：钢筋混凝土楼板火灾反应数值计算模型

Mon, 02 Jun 2008 04:38:35 GMT

钢筋混凝土楼板火灾反应数值计算模型
陈适才，任爱珠，王静峰，陆新征
工程力学, 2008, 25(3): 107-112.

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摘要：基于退化壳原理，考虑火灾下板壳截面的不均匀温度场分布而引入分层模型，同时在每分层上考虑材料在不同温度下的热力弹塑性本构关系，建立了火灾下钢筋混凝土板壳结构的有限元数值计算模型。另外，通过全拉格朗日方法考虑了大位移的几何非线性影响。最后通过一钢筋混凝土板在高温下的试验进行了验证，并分析了配筋率和保护层厚度的影响。结果表明：提出的火灾下钢筋混凝土壳单元数值计算模型的计算结果与试验结果吻合较好，可以用来分析火灾下钢筋混凝土框架结构楼板的反应。
关键词：钢筋混凝土板壳；火灾反应；分层模型；薄膜作用；非线性分析

NUMERICAL MODELING OF REINFORCED CONCRETE SLABS SUBJECTED TO FIRE
CHEN Shi-cai , REN Ai-zhu , WANG Jing-feng , LU Xin-zheng
Engineering Mechanics, 2008, 25(3): 107-112

Abstract: Based on the degenerated shell theory, a finite element numerical model is proposed to analyze the behavior of the reinforced concrete slabs exposed to fire. The non-uniform temperature distribution across the section of the slab is considered. The temperature dependent thermal-elastic plastic material model is introduced in each layer through the layered model. The geometric nonlinearity due to large displacement is taken into consideration through Total Lagrange approach. The proposed model is validated by a fire experimental test on a reinforced concrete slab and the effects of parameters including the ratio of reinforcement and the thickness of the concrete cover are analyzed. The results show that the predictions agree well with the experimental results and the proposed model can be used to analyze the response of the reinforced concrete slabs under fire.
Key words: reinforced concrete slab; fire response; layered model; membrane action; nonlinear analysis

灾区工作照片

Tue, 27 May 2008 10:52:21 GMT

我是很喜欢照一些“到此一游”的照片的。从四川回来才发现，几个G的数码照片里，忙得没有什么自己的照片。从同事的相机找到几张，可惜大都是背影，作为在灾区这段生活的一个纪念吧。

灾区工作小结2

Sat, 24 May 2008 13:04:59 GMT

在清华大学土木工程系专家组17日抵达绵阳后，此后几天又陆续有重庆、广州、厦门、中国建筑科学研究院等大批外地支援专家抵达。到21日，绵阳市区建筑排查最困难的阶段已经过去。与此同时，清华大学水利系的专家组也来到绵阳开展工作。灾区的各项情况，包括物资供应、道路、地质灾害等，也日趋好转。因此，有关部门批准清华大学土木工程系专家组进一步深入周边郊县，到更困难的灾区开展建筑安全排查和震害调研工作。

到现在为止，清华大学土木系专家组先后分批深入江油（含雁门镇等），安县（含秀水镇等），平武，梓潼等周边郊县开展工作。工作的任务顺序和绵阳市区基本相同，首先排查政府部门行政办公建筑，其次是学校、医院等公共建筑，另外还有一些厂房设备住宅等。排查建筑物的总面积已经近200万平米(估算数字，详细统计还没出来)。

与城区相比，郊县建筑物散布范围更广，建筑物类型更加多样，震害现象和原因更加复杂，次生灾害也更多。郊县排查工作的几个突出特点是：

(1) 场地影响更加多样化。绵阳市区由于范围有限，且以平原为主，场地差异不是很明显。而郊县，特别是山区，场地差异度更大。同样两个村子，可能一个在山这头，几乎全毁，另一个在山那头，几乎安然无恙。

(2) 建筑类型更加复杂。由于设计力量和管理力度的问题，郊县很多建筑物的设计很不规范，很难确定其结构形式，判断其破坏原因和安全程度，例如遇到很多框架不是框架，砌体不是砌体的四不像建筑，给排查工作带来很多困难。

(3) 地质灾害复杂。绵阳以西以北很多是山区，地质灾害活跃，且在本次地震中更加加剧。例如有一个学校，是建在一个山坡上，大部分校舍经检查都是不错的，但是整个边坡出现很多隐患，让我们很不放心，建议另派地质专家进一步分析。

另外，随着时间的推延，灾区居民已经从最初的打击中逐步恢复，不仅开始考虑安全问题，还考虑经济问题，给排查工作带来了很多干扰。清华大学土木工程系专家组对多所有争议建筑进行了复查，本着科学严谨的工作态度，确认建筑的安全情况，受到灾区居民的认可。

应该说，到目前为止，灾区的整个“应急救援”工作表现得很好，但是整个“救灾”工作距离最后胜利还有很多很艰辛的工作要走。如何克服目前体制上的、习惯上的、甚至人性上的痼疾，使得这次四川震害工作能够善始善终，还需要更多艰苦的努力和付出。

从明天开始，绵阳外地支援专家组将开始逐步有组织撤离，感谢一直和我们无间配合的地方政府和工作人员，感谢学校和后方的同事、朋友，感谢我们的亲人的理解和支持。清华和灾区人民同在，只要需要，我们随时准备回来。

本文为个人观点

89规范，活人无数，功德无量

Fri, 23 May 2008 05:14:58 GMT

一周来工作的基本总结：

89规范，活人无数！功德无量！

基本上90年代后，按照规范认真设计施工的工程，震害明显减轻。

请不要让我们的希望哭泣

Thu, 22 May 2008 15:07:50 GMT

灾区部分山区学校和希望小学震害调查照片

再一次说，我们不是没有机会的。同样地区的另外一所希望小学，同样是纵墙承重预制楼板砌体结构，只有轻微裂缝，完全不像劫后余生的样子（同一校园内的另外两座建筑，被分别判定为“加固后使用”和“拆除”，可见场地烈度并不小）。

我们并不一定需要很多的投资，很多的技术，只需要一点智慧和责任心！

灾区工作小结

Wed, 21 May 2008 11:57:04 GMT

来灾区已经5天了，简要总结一下在灾区的工作生活情况。

16日中午得到通知，17日一早前往灾区，走得非常匆忙，但是得到了家人的有力支持，非常感动。

17日上午清华大学土木系派出的第一批专家和很多救灾人员一起抵达成都。一下飞机就被四川省建设厅的同志接到直接送往目前最需要的绵阳市。绵阳全市有大约4千万平米的建筑物，需要在灾后逐栋尽快进行排查，目前急缺建筑结构的专家。

达到绵阳后，赶紧吃了午饭，就开始工作。首先去的是绵阳X中，检查了初中部、高中部、实验楼、综合楼、教师宿舍等多栋不同类型的建筑物，而后在市区检查了两栋高层建筑，主要是了解绵阳市建筑物的情况和损坏情况，为进一步开展工作准备资料。晚上清华专家组进行了讨论，根据调查情况对绵阳市目前的排查工作提了一些意见。

18日上午开始正事开展工作，一直到现在为止，清华专家组已经对近百万平米的建筑物进行了排查。绵阳市对清华专家组给予了很高的信任，清华专家组承担了包括绵阳市最高的建筑物、现政府办公所在地、绵阳九洲体育场、最高的住宅楼、以及周边郊县政府建筑等要害或复杂结构的排查任务。很多高层建筑由于震害电梯不能工作，排查的专家们都很辛苦。基本上90年代以后的建筑物，如果结构形式比较规则，则一般震害不大。但是一些老旧建筑或异型建筑则震害较严重。例如，笔者所在工作组今天一天就排查了4栋建筑要立刻“停止使用”，1栋要立刻“拆除”。

清华专家组一直要求去更困难的灾区开展工作。但是相关部门出于安全考虑，一直没有批准。现在灾区情况还是比较复杂，例如19日晚突然收到有强余震警报，大家紧急避险，检查专家们在公共汽车上住了整整一天一夜。由于连日工作非常疲劳，我稀里糊涂的睡在汽车地板上，早上才发现自己的枕头原来是自己的旅游鞋……

目前绵阳已经有来自全国各地的上百位结构鉴定专家，包括广州、厦门、还有中国建筑设计研究院的老朋友们，情况正在好转，有望能尽快完成排查任务。

汶川地震导致的结构破坏

Mon, 19 May 2008 14:43:57 GMT

明天出发去灾区

Fri, 16 May 2008 15:59:07 GMT

汶川资料收集及抗震分析

Thu, 15 May 2008 10:17:49 GMT

汶川地震确实是一个大灾难，大浩劫。但是我们可以在灾害来临前做一点事情，可以避免很多伤亡，减少很多悲剧。

网上看到的，设置圈梁构造柱，未倒塌

奇闻共欣赏：业内人士谈什么样的楼盘最抗震

Tue, 13 May 2008 03:47:11 GMT

http://bj.house.sina.com.cn/news/2008-05-12/2335251878.html

　2008年5月12日下午14时28分，四川省汶川县发生7.8级地震，北京、上海、天津、山西、陕西等全国多个省市有明显震感。人定胜天，到底什么样的楼盘最能抗震？新浪房产特邀请多位资深业内人士发表看法(排名部分先后)。

《楼市》传媒蔡鸿岩：剪力墙结构最抗震，也就是塔楼相对抗震些。

远洋地产(企业专区,旗下楼盘)肖劲：越矮的楼越抗震

建筑师王刚：剪力墙结构比框架的好，框架比混砖好。但无论何种形式要按国家抗震规范执行就没问题。北京为八度抗震区。

北师大教授黄兴文：北京近十几年的房屋都是按抗八级以上地震设计的，防震没有问题。同样抗震级别的房屋，低层的要好于高层的。

策划专家陈真诚：最基础地脚为原始石地再筑地基的框架结构建造的楼盘最抗震，那种新填土基上建砖混结构最不抗震。但要看防震设计，在北京当是近原生态地筑地基的别墅楼盘最抗震。

北京大学房地产研究所所长陈国强：建筑行业对不同类型建筑有相关的设计和建设规范，抗震标准高的或者符合国家抗震建筑规范的应该都比较抗震。

北师大房地产研究所所长董藩：钢结构的抗震，建筑是分抗震等级的。

清华大学建筑学院书记边兰春：国家在建筑设计上，不同地区有不同的抗震设计标准。无论那种结构设计选型，都要达到抗震设计的规范标准。

资深媒体人蔡照明：剪力墙结构比较抗震。

5.12记忆

Tue, 13 May 2008 00:58:27 GMT

记录一下昨天的经历吧

下午6点多，终于飞机落地，照例给妈妈打个电话，报个平安。妈妈在电话那边很关心，说四川发生地震了，不知道北京是否受到影响，说北京救援力量正在机场准备出发。我赶紧问了一下，四川地震有多大，在哪里？妈妈回答说大概有7.8级，距离成都大概50多公里。听完心里立刻就咯噔一下。赶紧安慰妈妈说四川地震北京估计影响不大，救援部队要去的话也从南苑或西郊机场出发，我在首都机场，估计不会有什么大问题。我怕妈妈听错了，在等行李的时候就用手机上网查了一下。手机速度很慢，只来得及看两个关键字：汶川、7.8级。上了出租车赶紧给同事们联系，问是否有新的消息。赶紧打开电脑，查了一下抗震规范：汶川：7度设防。心里就凉了一多半了。查看了附近地层情况，断层估计的南北向为主。

到家后赶紧开电视、上网。从百度上打开了汶川附近的地图，同时，电视播报是浅源地震，在地图上标识出附近城市的设防水准，大部是7度，还有6度的。用尺子测量了一下主要距离，汶川－都江堰：直线距离63公里，汶川－成都，直线距离131公里。估算了一下，这次咱们损失小不了。和H博士电话交流了一下后，把一些个人估计情况向领导汇报了一下。看滚动新闻直到夜里12点多，估计晚上很难有震中的消息了。胡乱吃了点东西，电脑也没关。一早就醒了，查了一下网络消息，好歹震中开始有一些消息出来了。山区的情况确实很复杂，继续关注。

打印 | 推荐 | 订阅 | 收藏汶川周边抗震设防情况

Mon, 12 May 2008 15:44:46 GMT

新上载论文：Distributed TLDs in RC floors and their vibration reduction efficiency

Wed, 23 Apr 2008 05:19:25 GMT

Distributed TLDs in RC floors and their vibration reduction efficiency

Ye LP, Lu XZ, Qu Z, Hou JQ

Earthquake Engineering and Engineering Vibration, 2008, 7(1): 107-112.

PDF Version

ABSTRACT: A novel distributed tuned liquid damper (DTLD) to reduce the vibration of structures is pro-posed in this paper. Its basic working principle is filling of the empty space inside the pipes or boxes of the cast-in-situ hollow reinforced concrete (RC) floor slabs with water or other damping liquid. Hence these pipes or boxes will work as a series of small TLDs inside the structure. Thus, no additional spaces are needed for TLDs whilst the damping ratio of the whole structure is obviously increased. Numerical simulation with the fluid-structure coupled effect is carried out to evaluate its vibration-reduction effect. The results indicate that distributed TLD can considerably increase the damping of the building and thus reduce the vibration. Some parameters influencing the vibration-reduction are also studied.

Keywords: distributed tuned liquid damper (DTLD), fluid-structure interaction (FSI), vibration reduction, hol-low floor slab

新上载论文：火灾下空间混凝土框架结构的反应分析与模拟

Fri, 18 Apr 2008 08:31:44 GMT

火灾下空间混凝土框架结构的反应分析与模拟
陈适才, 任爱珠, 陆新征

自然灾害学报/ Journal of Natural Disasters, 2007, 16(6):88-92.

PDF Version

摘要:根据作者开发并经过试验验证的纤维梁单元模型和分层壳单元模型,通过考虑他们之间的协调关系,建立了考虑楼板的空间混凝土框架结构火灾反应数值模型,并通过作者开发的火灾反应分析系统RCFire,实现了整体结构的火灾反应分析。纤维梁单元模型和分层壳单元模型均通过在截面上进行细分,从而考虑了不均匀温度场及材料非线性的影响。通过对一个具体框架火灾反应的分析,探讨了整体结构火灾反应的规律,为结构设计人员提高建筑结构的火灾安全提供参考。

关键词:火灾反应;空间混凝土框架;单元模型;数值模拟

Numerical analysis and simulation of space concrete frames under fire

Journal of Natural Disasters, 2007, 16(6):88-92.

PDF Version

Abstract: Based on the fiber element model and layered shell element model developed and validated by the authors, this paper establishes the numerical model for space concrete frames under fire. The connection relationship between the both elementmodels is also considered and the overall analysis p rocess of space concrete frames under fire is accomp lished by a system (RCFire) developed for analyzing the overall behavior of structures under fire. To consider the non2uniform temperature distribution and material nonlinearity, the across2sections of the both elements are subdivided into many small fibers or layers. Finally, a concrete frame structure under fire is analyzed and the response regularity is investigated. The results can be used as the reference for the fire safety design of building structures under fire.

Keywords: fire response; space concrete frame; element model; numerical simulation

新上载论文

Wed, 12 Mar 2008 06:38:23 GMT

基于通用有限元程序和微平面模型分析复杂应力混凝土结构
缪志伟, 陆新征, 李易, 叶列平

沈阳建筑大学学报(自然科学版), 2008, 24(1), 49-53.

摘要：目的为了能准确模拟混凝土的各种复杂力学行为，从而对复杂应力混凝土结构进行准确分析。方法本文基于近年来兴起的基于微观层次的混凝土本构模型——微平面模型原理，将其与具有优越非线性分析能力的通用有限元程序MSC.MARC相结合，开发了相关程序，并对混凝土在单轴、双轴、三轴受力状态、往复受力等各种应力状态下的行为和一片实际剪力墙的滞回加载进行了模拟分析计算。结果通过与相关试验结果的比较，验证了程序的可靠性，并指出了现有通用有限元程序在模拟复杂应力混凝土受力行为上的问题。结论表明本程序可较好的应用于分析复杂混凝土结构。

关键词：混凝土有限元；微平面模型；宏观本构模型；非线性分析

点击下载/Download Here

Analysis for concrete structures under complicated stress conditions based on general purpose FE software and microplane model

Miao ZW, Lu XZ, Li Y, Ye LP
Journal of Shenyang Jianzhu University (Natural Science), 2008, 24(1), 49-53.

Abstract: In order to precisely simulate the complicated mechanical behavior of concrete so as to accurately modeling the real complex concrete structures, a novel concrete constitutive model, which is referred as microplane model, is introduced in this paper and integrated into the general purpose finite element (FE) software of MSC.MARC which has outstanding nonlinear capacity. Concrete specimens under uniaixial, biaxial, triaxial and cycle loading are simulated with the proposed program as well as a reinforced concrete (RC) shear wall under cycle loading. Compared the numerical predictions of proposed program to the test results, good agreements can be found. And the problems of concrete models in common FE software are pointed out, when they are used to simulate complicated concrete mechanical behaviors. The results show that the proposed program can precisely simulated the complicated concrete structures.

Keywords: concrete finite element; microplane model; constitutive models; nonlinear analysis

沉痛悼念王先生

Tue, 26 Feb 2008 09:38:22 GMT

去年还商量怎么给老人家祝寿呢……清华土木的又一大损失啊……

Windows server 2003调整远程桌面用户数

Fri, 11 Jan 2008 09:05:38 GMT

使用终端服务配置(Tscc.msc)

(1)连接数设置：可在“网卡”选项中更改。设置更多地连接数可使更多的用户同时登录服务器。默认最多同时两个用户连接，如果想要使3个以上的用户同时使用远程桌面功能，则必须安装终端服务，安装后就可以任意设定用户数制。

安装终端服务可通过Windows的“添加/删除程序”—〉“添加/删除Windows组件”中，选中“终端服务器”来添加。

由于每个用户连接远程桌面后最小占用12MB左右的内存，因此可根据服务器内存大小来设定用户数，一般用户数不要太多，以免影响性能。如256MB内存可设定用户数8个左右，512MB内存可设定20~30个。

新上载论文: FRP片材加固混凝土梁剥离承载力的计算及设计方法

Wed, 09 Jan 2008 07:32:44 GMT

FRP片材加固混凝土梁剥离承载力的计算及设计方法

叶列平，陆新征，滕锦光，陈建飞

建筑结构/Building Structures, 2007. 37(12): 79-82.

Download PDF version

摘要：粘贴FRP片材加固混凝土结构的界面剥离问题是FRP片材加固混凝土结构技术的关键基础问题。本文根据近年来对FRP片材加固混凝土的界面粘结性能、FRP片材加固混凝土梁的受弯和受剪剥离性能的试验和理论研究，介绍了FRP片材加固混凝土梁的抗弯和抗剪剥离承载力的计算和设计方法，及其有关保证剥离承载力的构造要求。
关键词：FRP片材，加固，剥离，界面

Design Models for the Debonding Strength of RC Beams Strengthened with FRP Sheets/Plates

Ye Lieping, Lu Xinzheng, Teng Jinguang, Chen Jianfei

Building Structures, 2007. 37(12): 79-82.

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Abstract: The FRP-to-concrete interfacial debonding is a fundamental key problem for the strengthening of RC structures with externally bonded FRP sheets/plates. This paper presents the design models and detail designs on the flexural or shear debonding of RC beams strengthened with FRP sheets/plates, which is based on the latest experimental and theoretical researches on the FRP-to-concrete interfacial constitutive behavior, flexural and shear strengthening.
Keywords: FRP sheets/plates, strengthening, debonding, interface.

上载论文: 变轴力下钢筋混凝土柱的抗震性能分析

Tue, 08 Jan 2008 01:17:09 GMT

变轴力下钢筋混凝土柱的抗震性能分析

汪训流陆新征叶列平

工业建筑/Industrial Construction, 2007. 37(12): 71-75.

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摘要 准确预测地震作用下钢筋混凝土（RC）柱的受力特性，对评估混凝土结构的抗震性能具有重要意义。地震作用下，混凝土结构中的RC柱除承受水平荷载外，还由于地震作用引起的倾覆力矩影响承受变轴力作用。因此，往复荷载下RC柱受力及变形特性的研究应该考虑变轴力的影响。本文首先通过恒轴力和变轴力下RC柱滞回性能的模拟，验证了本研究基于纤维模型程序开发的数值分析模型的准确性。然后，利用该数值模型和分析程序，对一RC柱进行了不同变轴力模式下滞回性能的分析研究。分析结果表明，轴力的变化对RC柱的滞回性能有很大影响。由于非耦合型变轴力变化过程的随机性，为便于变轴力下RC柱的抗震性能分析和试验研究，本文提出了等代定轴力的概念及其确定方法。
关键词 纤维模型变轴力混凝土柱抗震性能滞回分析

Analysis of Earthquake-resistant behaviors for RC Columns under Variable Axial Loads

Wang Xunliu, Lu Xinzheng，Ye Lieping

Industrial Construction, 2007. 37(12): 71-75.

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Abstract Precise prediction for the hysteretic behaviors of reinforced concrete (RC) column under seismic load is important to assess the safety of RC structures under earthquake. Due to the overturning moment in the earthquakes, besides being subjected to seismic lateral forces, RC columns also experience variable axial loads. Therefore the influence of variable axial forces must be taken into account when to study the hysteretic behaviors of RC columns under cyclic loads. In this paper, a numerical analysis model based on a fiber model program have been validated firstly through the rational hysteretic simulations of two RC columns under various patterns of axial loads, Then a frame column has been simulated under various patterns of variable axial loads by numerical method. The analytical results indicate that the variety of axial loads has considerable effect on the hysteretic behaviors of RC columns. Because of the randomness of axial loads and to facilitate carrying on experimental researches and analyzing earthquake-resistant behaviors for RC structures, a equivalent fixed axial load method is put forward to determine the seismic behaviors of RC column in structures under earthquake.
Keywords fiber model; variable axial load; concrete column; earthquake-resistant behavior; hysteretic analysis

Windows server 2003 ftp不能下载

Mon, 07 Jan 2008 03:15:19 GMT

打齐补丁

上载论文: 往复荷载下钢筋混凝土柱受力性能的数值模拟

Thu, 03 Jan 2008 15:03:26 GMT

往复荷载下钢筋混凝土柱受力性能的数值模拟

汪训流，陆新征，叶列平

工程力学/Engineering Mechanics, 2007, 24(12): 76-81

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摘要：准确预测地震荷载下钢筋混凝土柱的受力性能，对评估震后混凝土框架结构及桥梁结构的安全性和震害损失具有重要意义。由于复杂的材料性能和受力行为，地震作用下钢筋混凝土柱受力性能的准确计算目前仍需主要借助数值模拟，并且对数值模型中混凝土和钢筋材料的滞回本构关系提出了更高的精度要求。本文基于纤维分析模型，采用更加完善的反复荷载下钢筋和混凝土的本构，编制了可精确分析钢筋混凝土杆系结构及构件在往复荷载下受力性能的计算程序，并对不同轴压比和不同配筋率的2根压弯柱试件进行了数值模拟，计算结果与试验结果吻合良好。
关键词：纤维模型；往复荷载；混凝土柱；滞回关系；数值分析

Numerical Simulation for the Hysteresis Behavior of RC Columns under Cyclic Loads

WANG Xunliu, LU Xinzheng, YE Lieping

Engineering Mechanics, 2007, 24(12): 76-81

Abstract：Precise prediction for the hysteresis behaviors of reinforced concrete (RC) columns under seismic loads is important to assess the safety of RC frames and bridges during sever earthquake. Due to the complicated material behavior and complex external force during the earthquake, an accurate simulation of the behaviors under seismic loads currently mainly depends on numerical method, and more precisions are demanded for the hysteresis constitutive laws of concrete and steel reinforcement. In this paper, a fiber model program is developed with more precise hysteresis constitutive laws of concrete and steel reinforcement. Two columns, which are under cyclic compressive-bending loads, with different axial load ratios and reinforcement ratios are analyzed and the simulation results are found agreed well with test results.
Key words: fiber model; cyclic load; concrete column; hysteretic relation; numerical analysis

上载论文：高强配筋剪力墙框－剪结构的地震行为研究

Wed, 26 Dec 2007 06:43:40 GMT

高强配筋剪力墙框－剪结构的地震行为研究

缪志伟，陆新征，叶列平，姚震宇

华中科技大学学报(城市科学版), 2007, 24(4): 17-21.

摘要 在框－剪结构的剪力墙中配置高强钢筋可以显著提高其安全储备，使得剪力墙在框架之后屈服，并改变地震剪力的分配规律。本文利用MSC.Marc 2005以及清华大学在MSC.Marc基础上开发的混凝土纤维模型程序THUFIBER和适用于剪力墙结构非线性分析的分层壳墙单元模型，对高强配筋及普通配筋的两个8层钢筋混凝土框－剪结构进行了静力推覆分析和三种实际地震波作用下的动力时程分析，重点研究了高强钢筋对框－剪结构抗震性能控制的效果。研究结果表明，剪力墙中采用高强钢筋配筋后，改变了剪力墙和框架的刚度退化规律，提高了剪力墙的屈服强度，且同时具有较好的极限变形能力，可以有效提高整个结构的安全储备，对结构抗震是有利的。

关键词 框－剪结构高强钢筋静力推覆动力非线性

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Study on the seismic performance of frame-shear wall structures with high-strength reinforced shear wall

MIAO Zhiwei, LU Xingzheng, YE Lieping, YAO Zhenyu

Abstract: High strength steel reinforcement in the shear walls of frame-shear wall structures can efficiently increase the safety margin and change the seismic force distribution because the shear wall will yield after the frame. With the fiber model program THUFIBER and the multi-layer-shell program, which are developed by Tsinghua University and are based on the general purpose finite element software of MSC.MARC, two 8-story reinforced concrete frame-shear wall structures, whose shear wall are reinforced with normal and high strength steel respectively, are studied with static pushover and dynamic analysis. The effect of high strength steel in the shear wall to the control of seismic performance of the structures is emphasized. The results show that with high strength steel in the shear wall, the softening behaviors of frame and shear wall are changed. The yield strength of the shear wall is increased while it still has the same the deformation capacity. And the safety margin of the whole structure is efficiently increased which benefits the seismic capacity of the structure.

Key words: frame-shear wall; high-strength reinforcement; pushover; dynamic; nonlinear

上载论文：桥梁在灾害作用下的高性能仿真分析

Wed, 12 Dec 2007 14:04:44 GMT

桥梁在灾害作用下的高性能仿真分析

陆新征, 李易, 张炎圣, 黄盛楠, 江见鲸

首届工程设计高性能计算（HPC）技术应用论坛论文集, 2007. 12. 11-12, 上海: 102-110.

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【摘要】桥梁是交通生命线的枢纽工程。我国是一个灾害多发国家，且目前处于经济高速发展阶段，各种自然和人为灾害对桥梁工程造成严重威胁。由于灾害的区域性、突发性和毁灭性等特点，所以计算机仿真技术在解决桥梁防灾问题方面有着突出的优势。本文对清华大学土木工程系开展的基于高性能计算的桥梁防灾研究的代表性成果进行了介绍。包括基于大比例桥梁模型实验对桥梁结构非线性计算方法的探讨和验证。对各种尺度下多种桥梁灾害行为的高性能仿真分析。例如在小尺度范围内研究了单体桥梁受到超重车辆过桥时的动力作用，以及受到超高车辆撞击作用。在大尺度范围内研究了地震行波效应对超长高架桥梁破坏的影响。针对高性能仿真遇到的关键瓶颈问题：桥梁非线性建模问题，开发了桥梁非线性快速建模方法。为深入研究高架桥梁体系在各种灾害下的破坏模式和安全状况提供了依据。

【关键词】桥梁，高性能仿真分析，超载，撞击，地震，快速建模

High Performance Simulation for Bridges under Disaster

Lu Xin-zheng，Li Yi，Zhang Yan-sheng，Huang Sheng-nan，Jiang Jian-jing

Proc. 1st Symp. on High Performance Computing (HPC) Technology in Engineering Design, 2007. Dec. 11-12, Shanghai: 102-110.

Abstract: Bridge is the key project in lifeline engineering. Currently, various natural and man-induced disasters become a serious threat to the bridges in China. Due to the large-scale, unpredictable, and destructive features of disasters, computer simulation has obvious advantages in disaster prevention and mitigation of bridges. This paper presents the researches on disaster prevention and mitigation of bridges developed by the Department of Civil Engineering in Tsinghua University, which base on high performance computing. The nonlinear computing method is discussed and benchmarked with large-scale test. High performance simulation on different scales for bridges implemented by Tsinghua University are presented. In small scale, analyses about dynamic behavior of the bridge traveled by overload trucks and impact on the bridge by over-high trucks are illustrated. And in large scale, failure simulation for large viaducts with traveling wave effect is presented. In addition, Tsinghua University also developed the nonlinear quick modeling method for bridges, so as to provide abilities to conveniently obtain the failure model and safety assessment of bridges under various disasters.

Keywords: bridge, high performance simulation, overloaded, impact, earthquake, quick modeling.

上载论文：建筑结构在灾害作用下的高性能仿真分析

Tue, 11 Dec 2007 03:35:42 GMT

建筑结构在灾害作用下的高性能仿真分析

陆新征, 李易, 缪志伟, 陈序平, 梁益

首届工程设计高性能计算（HPC）技术应用论坛论文集, 2007. 12. 11-12, 上海: 93-101.

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【摘要】地震、爆炸等荷载可能对建筑或建筑群造成严重损害，是结构防灾设计的重要内容，高性能计算为研究建筑物在各种灾害下的行为提供了有力工具。清华大学土木工程系开发了一系列的材料、构件和结构数值模型，并基于高性能并行计算和非线性分析，对倒塌、倾覆等结构极限状态以及城市群震害损失进行了研究。为建筑和城市减灾提供了有力工具。
【关键词】建筑结构，高性能仿真分析，有限元模型，连续倒塌，冲击波，城市建筑群

High Performance Simulation for Building Structures under Disaster

Lu Xin-zheng，Li Yi，Miao Zhi-wei，Chen Xu-ping，Liang Yi

Proc. 1st Symp. on High Performance Computing (HPC) Technology in Engineering Design, 2007. Dec. 11-12, Shanghai: 93-101.

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Abstract: Buildings and building clusters could be destroyed by disaster load, such as earthquake and blast. Accurate prediction for the behavior of building structures in various disasters provided by high-performance numerical computing is important to structural design. The Department of Civil Engineering in Tsinghua University developed a series of advanced numerical models including material laws and element models. Therefore, base on parallel computing and nonlinear methods, analyses about some extreme problems of building structures such as collapse, overturning and the loss of earthquake damage of urban building clusters are successfully processed. Hence, the analyses provide important advice for disaster prevention and mitigation.
Keywords: building structure, high-performance simulating analysis, finite element model, progressive collapse, blast wave, urban building clusters

新上载论文：Pushover方法的准确性和适用性讨论

Wed, 14 Nov 2007 01:31:47 GMT

Pushover方法的准确性和适用性讨论

缪志伟，马千里，叶列平，陆新征

第11届高层建筑抗震技术交流会论文集, 2007. 11. 8-10, 昆明: 141-145.

摘要：Pushover方法作为一种建筑结构弹塑性地震响应的简化近似计算方法和抗震性能评价方法已得到广泛应用。但由于其理论基础不严密，其准确性需要给予必要确认，同时适用性也受到一定的限制。本文以逐步增量弹塑性时程方法为基准，分别以一个普通6层RC框架结构和一个18层RC框架-剪力墙结构为例，对Pushover方法的准确性和适用性进行了分析研究。结果表明，Pushover方法仅适用于以第一振型为主的高度不大的结构，且应采用两种以上的侧力模式；对于高阶振型影响较大的结构，该方法准确性较差，承载力预测显著偏低。

关键词：Pushover分析，框架结构，框架-剪力墙结构，逐步增量弹塑性时程分析

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Study on the Accuracy and Applicability of the Pushover Analysis

Miao Zhi-wei, Ma Qian-li, Ye Lie-ping, Lu Xin-zheng

Proc. 11th Conf. on earthquake resistance technology of high-rise buildings, Nov. 2007. Kunming, China, 141-145

Abstract: The nonlinear static pushover analysis procedure is now widely used as a simple method to estimate the inelastic seismic response for building structures. However, the accuracy of the method still needs to be validated because of the inherent limitation in the theory of the method. Besides, there are some confines on the application of this method. In this paper, a 6-storey RC frame and an 18-storey RC frame-wall structure are analyzed with both pushover method and the incremental dynamical analysis method respectively. The comparison between the results of the two methods shows that the pushover method can be used only for low structures which are controlled by the first modal shape. It is also shown that for the structures which are influenced by the higher modal shape evidently, pushover analysis always gives the much lower capacity result.

Keywords: pushover analysis, RC frame, frame-wall structure, IDA

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上载论文: 往复荷载下钢筋混凝土柱受力性能的数值模拟

上载论文：高强配筋剪力墙框－剪结构的地震行为研究

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