西安火车站改造东配楼弹塑性时程分析

Dynamic Elastoplastic time history analysis at Renovation East Building of Xi’an Railway Station

西安站改造东配楼是由3个单体组成的刚度和质量均不对称的多塔连体结构,结构的扭转效应明显.采用大型通用SAP2000有限元软件,对该结构进行动力弹塑性时程分析.结果表明,该结构在8度多遇、罕遇地震作用下,其层间位移角均满足规范要求,支撑连接体处和角部框架柱区域的位移响应较大,构件内力发展迅速,悬臂梁下框架柱弯矩为弹性地震的3.96倍.大部分框架梁先进入塑性发展阶段,随后仅部分框架柱进入塑性区,且发展程度较小,符合结构"强柱弱梁"的原则.支撑连接体的框架柱、悬挑梁为薄弱构件,均进入"立即使用"状态.悬挑梁下的框架柱超过防倒塌阶段,进入极限强度状态.建议对支撑连体处构件和角部框架梁柱采取加固措施.

Xi’an Railway Station East Building is a multi-tower connected structure composed of three monomers.The quality and stiffness are asymmetric,torsion effect is obvious.The dynamic elastoplastic time history analysis of the structure is carried out by using a heavy section general SAP2000 finite element software.The results show that the structure during earthquake of 8 degrees under the rare earthquake,the interlayer displacement angle can meet the requirements of specification;support displacement and corner connecting body at the column area is large;the internal force response is developed rapidly,the bending moment of the frame column under the cantilever beam is 3.96 times of that of the elastic earthquake.Most of the frame beams are advanced into the plastic development stage,and then only some frame columns enter the plastic zone,and the development degree is small,which accords with the principle of"strong column and weak beam".The frame column and cantilever beam supporting the connecting body are weak components and all enter the"immediate use"state.The frame column under the cantilever beam exceeds the collapse resistance stage and enters the ultimate strength state.It is suggested that reinforcement measures should be taken to support the joint members and the angle frame beams and columns.