摘要
首先介绍目前结构倒塌模拟分析中存在的主要问题,之后基于材料的损伤和失效准则,提出一种适用于钢结构在强震下的倒塌模拟方法。详细介绍这种方法的原理和步骤,以一个含有薄弱层的8层钢框架结构为例进行方法验证。定义钢材的初始损伤,采用线性准则定义钢材的损伤演化规律,通过通用接触算法来模拟单元间的接触行为。获得模型的宏观倒塌形态,探讨模型倒塌前后典型楼层的水平加速度反应和竖向加速度反应的变化规律,并与相关试验研究结果进行比较,研究模型关键构件的滞回特性和失效机理。分析结果显示,所采用的基于材料损伤和失效准则的倒塌模拟方法能客观地描述结构构件累积损伤和失效的过程,同时也能较为准确地再现结构的倒塌形态。
Some important problems in numerical simulation of structure collapse are discussed. Based on the material damage and failure laws,a simulation method of steel structure collapse under rare earthquake is proposed. The detailed theory and procedure of the method are introduced,and then,to verify the method,a 8-story steel frame structure with weak floor is simulated. A damage initiation is defined firstly,a damage evolution law is defined by using linear evolution law,and the contact behaviors between elements are then defined by using general contact algorithm. The macroscopic collapse responses of model are obtained,and the horizontal and vertical acceleration responses of typical story before and after model collapse are presented and discussed. The comparison of numerical results and test results is carried out,and the hysteretic characteristic and failure mechanism of key components are also studied. Analyzing results indicate that this simulation method can objectively describe the damage build-up and failure procedure of structural component,and at the same time accurately simulate the structure collapse characteristics.
出处
《土木工程学报》
EI
CSCD
北大核心
2014年第9期38-44,共7页
China Civil Engineering Journal
基金
中国建筑科学研究院青年科研基金
关键词
结构倒塌
材料损伤
材料失效
钢结构
数值模拟
structure collapse
material damage
material failure
steel structure
numerical simulation
