摘要
大跨空间网架结构具有跨度大、竖向刚度低、阻尼小、对竖向地震作用比较敏感等特点,因此,在竖向地震作用下,对该类结构体系非线性动力性能的研究尤为重要.基于有限元法,针对我国某地区一实际大跨网架结构,对其进行竖向地震激励下的动力性能研究,采用增量动力分析(IDA)方法对该结构进行了抗震性能评价,得到了该结构的薄弱位置及倒塌极限.研究表明:该网架结构具有良好的竖向抗震性能;随着结构塑性发展,IDA曲线的离散性明显;结构概率分位50%,对应的倒塌极限位移为0.337,m;薄弱构件主要分布于下弦,尤其是下弦节点附加质量区域,且杆件的塑性发展集中于附加质量区域.
The large span space grid structure is highly sensitive to the vertical component of the seismic action due to the large span,low vertical stiffness and its small damping property,therefore,a research of nonlinear dynamic behaviors on this structural system subjected to the vertical seismic component is particularly important.Based on the finite element method,the nonlinear dynamic behaviors of a real large span grid structure located in a region of China are investigatedunder earthquake actions.The seismic performance of the structure is evaluated using the Incremental Dynamic Analy-sis（IDA）method.The weak location and collapse ultimate point of the structure is obtained.Results show that the structure has a good seismic performance;the difference among the IDA curves is remarkableas plasticity development of members.It is observed that the collapse limit displacement of 50%, probability is 0.337 m,and that weak members occur at the lower region where the masses are assigned.
出处
《天津城建大学学报》
2016年第6期416-422,470,共8页
Journal of Tianjin Chengjian University
基金
国家自然科学基金青年基金(51108301)
关键词
大跨网架结构
抗震性能
增量动力分析
倒塌
large span grid structure
seismic behavior
incremental dynamic analysis
collapse
