摘要
利用MSC.MARC有限元软件建立了大底板多塔楼隔震结构在双向水平地震激励下的有限元分析模型,并对该结构进行了弹塑性时程分析,得到结构底板在双向水平地震激励下各时刻的内力。讨论了底板的薄弱位置及底板内力的影响因素。分析结果表明:底板的薄弱位置处于两塔楼之间;当塔楼不等高及塔楼在底板上不对称布置时,底板的应力均比等高对称塔楼大;而当塔楼等高且对称布置时,增大塔楼的间距,底板应力变化不明显。在设计中,应结合工程实际情况,对底板采取相应加强措施。
A FEM analysis model of base-isolated multi-tower structure with a large floor is established by MSC.MARC,elasto-plastic time-history analysis of the structure is employed,and the internal force of the floor each hour in bi-directional earthquake excitation is derived.The weak positions and the influencing factors of the floor are discussed.The result shows that the weak positions of the floor are at the floor between two towers.When the heights of two towers are not equal and in asymmetric arrangement on the floor,the maximum stress of the floor is larger than symmetrical structure.When the distance of the two towers increases,the stress of floor does not change significantly.Therefore,the project should adopt the reinforce measure with practice engineering situation.
出处
《工程抗震与加固改造》
北大核心
2012年第6期45-49,54,共6页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金(50978130)
关键词
大底板多塔楼
基础隔震
底板内力
非对称
分层壳单元
multi-tower structure with a large floor
base isolation
floor internal force
asymmetric
layered shell element
