基于SAP2000的防屈曲支撑结构抗震性能分析

Analysis of Seismic Performance of Anti-buckling Structure based on SAP2000

为了研究防屈曲支撑对结构抗震性能的影响,该文选取一栋高层框剪结构进行数值分析,通过SAP2000有限元软件建立原结构和防屈曲支撑架构两种模型,并对两模型分别进行模态分析、多遇地震下反应谱分析和罕遇地震下非线性时程分析,研究结果表明:在结构外围加入BRB后,结构的抗侧移刚度得以提升,而结构的自震周期和层间位移角得以减少;在罕遇地震作用下,BRB滞回曲线饱满,其耗能能力较强,能有效减少地震动传给结构的能量,使结构变得更加安全。

In order to study the effect of anti-buckling support on the seismic performance of a structure,this paper selected a high-rise frame-shear structure for numerical analysis,established two models:the original structure and the anti-buckling support structure with SAP2000 finite element software,and each model was subject to modal analysis,response spectrum analysis under frequent earthquakes and nonlinear time-history analysis under rare earthquakes.The results showed that after adding BRB to the periphery of the structure,the lateral stiffness of the structure can be improved,and the self-seismic period and the inter-layer displacement angle of the structure can be reduced;under the action of rare earthquakes,the BRB hysteresis curve is full and its energy consumption ability is strong,which can effectively reduce the energy transmitted by the ground motion to the structure and make the structure more secure.