江晓峰
    (华东建筑设计研究院有限公司，上海200002)

[摘要] 基于显式动力程序LS-DYNA数值计算平台，对其大震弹塑性时程分析的模拟方法与构件抗震性能评价方法进行研究和开发。首先在LS-DYNA材料库基础上开发了近50种复杂形式的典型截面，用于钢结构、钢筋混凝土及型钢混凝土等构件的参数化输入和纤维单元计算，经验证具有良好的计算精度。然后介绍了纤维积分单元的构件抗弯承载力误差估计和关于单元网格自动细分的子程序开发，同时介绍了钢结构构件等效初始缺陷的模拟方法。为合理且直观地评价结构构件的延性与塑性变形，建立了类似于美国ASCE 41-06的延性评价方法，并开发了有关程序。最后简单介绍了从模型接口到数据后处理的各项程序开发工作，以及已经完成的工程应用情况。经验证该数值方法具有合适的工程精度和高效的计算能力。
[关键词] LS-DYNA；弹塑性时程分析；性能设计；程序开发
中图分类号：TU313.3    文献标识码：A    文章编号：1002-848X(2012) S2-0018-06

Development and application of elasto-plastic time-history analysis based on LS-DYNA
Jiang Xiaofeng
( East China Architectural Design & Research Institute Co.,  Ltd.,  Shanghai 200002,  China)

Abstract: Based on the numerical platform of explicit analysis program LS-DYNA, the method of modeling and performance evaluation was studied and developed for elasto-plastic time-lustory analysis in major earthquake. Relying on the materiallibrary in LS-DYNA, nearly 50 complicated common sections were firstly developed with good accuracy, to aclueve convenient parametric input and fiber element analysis for steel structure, RC and SRC structure. Then the error estimation for flexural capacity of fiber integration element and program development of mesh refining to beam elements was introduced, and the simulation method for effective initial imperfection of steel members was also presented. To achieve a reasonable and clear-cut evaluation method for ductility and plastic deformation, one methodology similar to ASEC 41-06 was put foreword and subprogram was developed. Finally, some program developments from modeling transformation interface to result post-processing were briefly introduced and some finished applications were also briefly presented. This numerical method is verified to have good precision and efficient computational capacity.
Keywords: LS-DYNA; elasto-plastic time-history analysis; performance-based design; program development