摘要
近年来,由于门式刚架结构设计施工存在一些问题,导致工程安全事故屡见不鲜,尤其在地震作用下,较多门式刚架工程发生垮塌,造成了巨大的经济损失。以某大跨度门式刚架厂房为例,利用ANSYS有限元分析软件建立其三维计算模型,进行地震作用下的振动响应分析。首先,通过模态分析得到门式刚架的各阶振型和自振频率;然后,分别进行谱分析和地震反应时程分析。分析表明,谱分析的结果偏于安全,而地震反应时程分析的结果可以作为谱分析结果的复核检验。
In recent years, many engineering safety accidents on portal frame structures occurred because of the problems in design and construction. Some structures even collapsed under earthquake action, and caused enormous economic loss. Numerical study of a long-span portal frame workshop is performed by using ANSYS to establish three dimentional model of the workshop. Firstly, mode shapes and natural frequency of the structure are obtained through modal analysis. Then, spectrum analysis and time history analysis are performed. Results indicate that spectrum analysis is always tend to safety, and responses of time history analysis is necessary to be the recheck in the seismic analysis.
出处
《钢结构》
2012年第11期8-10,62,共4页
Steel Construction
关键词
门式刚架
地震作用
模态分析
谱分析
时程分析
portal frame
seismic action
modal analysis
spectrum analysis
time history analysis
