基于能量分析的近断层地震作用下框排架结构性能研究

Seismic behavior analysis for frame-bent structures subjected to near-fault ground motions

钢筋混凝土框排架结构是工业主厂房建筑的主要结构形式之一,为研究处于近断层地区的框排架结构的抗震性能,本文选取4条脉冲型、4条非脉冲型近断层地震波及4条远场地震波,以某钢筋混凝土框排架结构为原型结构建立有限元模型,研究结构在近断层地震动和远场地震动作用下的抗震性能。分析结果表明:脉冲型近断层地震动作用下结构的最大基底剪力是远场地震动的1.92倍,是非脉冲型的1.16倍;脉冲型近断层地震动作用下的最大层间位移是非脉冲型地震动的1.9倍,是远场地震动的5倍。因此,近断层地震动作用下框排架结构的动力反应需引起工程设计人员的重视。

The reinforced concrete frame-bent structure is one of main structure form of industrial main factory buildings.In order to study the seismicbehavior of the frame-bent structure located near the fault area,4 pulse-like,4 non-pulse near-fault motions and 4 farfault seismic waves are selected in this paper.The finite element model is established as the prototype of a reinforced concrete framebent structure,and the seismic behavior of this structure under the action of near-fault motions and far-fault motions is studied.The numerical analysis results indicate that:the maximum base shear of the structure under the action of near-fault ground motion is 1.92 times as much as that of the far-fault and 1.39 times of the non-pulsed near-fault ground motion;the maximum story drift under pulselike near-fault ground motion is 1.9 times of the non-pulse and 5 times of far-fault ground motion.Therefore,the dynamic response of the frame structure under the action of near-fault ground vibration should be paid more attention by engineering designers.