多层钢框架连续倒塌性能的有限元分析  

FINITE ELEMENT ANALYSIS ON PROGRESSIVE COLLAPSE PERFORMANCE OF MULTI-STORY STEEL FRAMES

作　　者：张建兴[1] 施刚[1] 

机构地区：[1]土木工程安全与耐久教育部重点实验室,清华大学土木工程系,北京100084

出　　处：《钢结构》2014年第11期20-27,共8页Steel Construction

摘　　要：为了探究运用有限元方法分析计算多层钢框架连续倒塌性能的准确性和可靠性,为后续的倒塌分析工作奠定基础,以某2层钢框架-组合楼板体系抗倒塌试验为例,运用通用有限元软件ANSYS建立三维有限元模型。为准确模拟钢框架结构的结构构件组成、构件间的约束和受力情况、钢框架的初始破坏和倒塌破坏等过程,详细介绍相关的有限元建模技术、参数取值、材料失效准则等,并运用该方法进行有限元模型验证。结果表明:建立的有限元模型能够准确模拟结构的动力响应和构件的破坏模态,从而能够准确地分析计算多层框架的连续倒塌性能。This paper aimed to investigate the accuracy and reliability of the method which can be used to analyze the progressive collapse performance of multi-story frames by using finite element analysis. After that it is possible to do systematic research. According to a progressive collapse experiment of two-story steel frame-composite slab system, a 3-D finite element model was established by using ANSYS. In order to simulate the real situation of progressive collapse in steel frames, in terms of components, constraints, loading conditions and the whole process of damage, this paper introduced in detail such as modeling technology, parameters value, failure criteria of materials, etc. The method was validated with the test results. The results showed that the proposed method can be accepted to analyze the progressive collapse performance of multi-story steel structures through the simulation of structural dynamic property and failure mode of structural components.

关 键 词：钢框架 连续倒塌 有限元分析 LS-DYNA 瞬时加载法 动力特性 

分 类 号：TU391[建筑科学—结构工程]