某钢筋混凝土核心筒结构基于两个软件弹塑性时程对比分析

摘要

某钢筋混凝土核心筒结构位于7度抗震设防区域,地上结构层数为51层,上部结构高度为228 m.采用NosaCAD和Perform-3D结构分析软件对该结构进行弹塑性时程分析,研究该结构在7度罕遇地震作用下的抗震性能.分析结果表明:罕遇地震下,塑性铰首先出现在剪力墙连梁上,随后框架粱进入屈服,最后底层极个别剪力墙混凝土出现压碎现象.结构最大层间位移角满足规范限值的1/100的要求.构件损坏顺序和损坏位置分布合理,构件损坏过程能耗散一定的地震输入能量.结构可以满足“大震不倒”的抗震设防要求.计算结果表明,两个软件结果具有相似性,结构的整体反应、薄弱部位、损伤分布情况等基本吻合.建议在复杂结构设计过程中若具备条件,可采用多软件进行弹塑性分析,取其包络值为判定标准以确保结构安全.%A reinforced concrete core wall structure is located in 7 seismic intensity area.There are 51 floors on the ground.The building height is 228 meters.In this paper,in order to study the seismic performance of the structure under rare intensity of 7 degree earthquakes,NosaCAD and Perform-3D were used to perform elasto-plastic time history analysis.The results indicate that under rare earthquakes,the yielding hinges firstly occur on some coupling beams,and then some frame columns yield.Finally few concrete of shear wall crushed at the bottom.The maximum inter story drift of the structure can meet the requirement of Chinese code.The order and distribution are reasonable,and the process can dissipate the seismic energy on some degree.The structure satisfies the code requirements of no collapse under rare earthquakes.The calculation results,such as the global response,weak layer and damage condition obtained by the two softwares show an agreement to a certain degree.It is suggested that the envelope value of multi-software analysis can be used to ensure the safety of such complex structure in practical projects.