老山自行车馆多点输入下地震响应及强度破坏分析

Seismic Response and Strength Failure Analysis of Laoshan Bicycle-Gymnasium Subjected to Multi-Support Excitations

采用时程分析法分别对奥运会老山自行车馆进行了多点和一致输入下的弹塑性地震响应和强度破坏分析。首先对两种输入方式下的结构响应进行了系统的对比,然后通过对极限加速度峰值、最大节点位移时程、塑性杆件数量和分布及网壳破坏形态等重要参数的统计、分析和归纳,剖析了奥运会老山自行车馆在多点输入和一致输入下的地震响应规律和强度破坏机理。研究表明,在强震作用下,多点输入下支承附近区域的杆件应力大于一致输入,这提示我们应注意该区域杆件的设计;无论是多点输入还是一致输入,结构强度破坏的位移模式都是溢出型;多点输入下结构的塑性开展更为充分,内力更为均匀。

Elastoplastic seismic response and strength failure analysis of Laoshan bicycle-gymnasium for the Olympic games are studied under multiple and simple support excitation.First the rule of elastoplastic seismic response is analyzed under two input modes,then some important parameters such as the utmost peak value of acceleration,time history of high-point displacement,the amount and distribution of elements under plastic,the deformation of shell in ruins are counted,analyzed and concluded.Under this,the rules of strength failure and seismic response about space lattice structure are obtained under multiple support excitations and simple support excitation.We should pay more attention to members which are near the supports because of their higher stresses under multiple support excitation compared with those under simple support.The destroy mode of displacement belongs to overflow type no matter what kind of input is concerned： multiple or simple support excitation.Namely,the structural displacements augment in short time and cause the structure to collapse.The plastic spreads more sufficiently and the internal force is more uniformity under multiple support excitations.And the more apparent of this phenomena,the lower of apparent velocity.