加固后结构在罕遇地震下弹塑性时程分析

Elasticplastic Time History Analysis of Reinforced Structures under Rare Earthquakes

文中以一栋既有混凝土框架结构为研究对象,以使用加设剪力墙的方式对其进行加固,并对加固后的结构进行罕遇地震下的弹塑性时程分析。结果表明,剪力墙加固后的结构在罕遇地震下层间位移角满足规范要求,大部分构件未被破坏,剪力墙破坏程度相较于框架梁柱更严重,剪力墙在二层出现轻度损坏,在楼梯间与厕所位置部分出现严重破坏;结构整体变形变化均匀,没有出现变形突变的情况;在罕遇地震下结构大多数楼板处于弹性阶段,由于剪力墙的存在吸收了一部分地震的能量,楼板未出现完全塑性楼板,从楼板塑性发展状况来看,采用剪力墙加固结构是可行的。

This article takes an existing concrete frame structure located in Xi'an,Shaanxi Province,which has undergone functional changes as the research object.The method of adding shear walls is used to reinforce it,and the reinforced structure is subjected to elastic-plastic time history analysis under rare earthquakes.The results show that the displacement angle between the lower layers of the structure reinforced with shear walls meets the requirements of the code in rare earthquakes,and most components are not damaged.The degree of damage to the shear walls is heavier than that of the frame beams and columns.The shear walls show mild damage on the second floor,and severe damage in the stairwell and toilet positions;The overall deformation of the structure is uniform and there is no sudden change in deformation;Under rare earthquakes,most of the floor slabs of the structure are in the elastic stage.Due to the existence of shear walls absorbing some of the seismic energy,the floor slabs have not appeared completely plastic.From the development of floor plasticity,it is feasible to use shear walls to reinforce the structure.