【作者】 樊剑； 魏俊杰； 刘铁；

【Author】 FAN Jian WEI Junjie Liu Tie (Department of civil Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

【机构】 华中科技大学土木工程与力学学院；

【摘要】 以实际地震波为底波,并叠加三角型脉冲运动模拟近断层地震；以此为输入,研究恢复力摩擦隔震结构 R-FBI 隔震结构在近断层地震下的动力反应特性,绘制了上部结构最大加速度(a_max)反应谱和基底最大滑移量(S_max)反应谱,并研究了不同脉冲类型以及脉冲周期对摩擦型隔震结构的 a_max和 S_max的影响．研究表明 R-FBI 结构的 a_max和 S_max与常规地震作用下相比均有较大的增加,且隔震范围有一定的减小；为了保护在强烈近断层地震作用下隔震结构与基坑相碰撞,提出了加设限位装置的防护措施,通过数值计算,验证了防护措施的必要性和有效性．更多还原

【Abstract】 The near-fault earthquake ground motions are simulated by combining recorded far-field ground motion with simple pulses that portray near-fault features.The analytical seismic responses of resilient-friction base isolator（R-FBI）are investigated under near-fault motions.Maximum acceleration response(a_max)spectrum of superstructure and maximum sliding displacement response(S_max)spectrum are plotted under different parameters such as superstructure flexibility,isolation period and the peak acceleration of ground motions.Comparison of results indicated that for R-FBI,both a_maxand S_maxin near-fault ground motion increase obviously compared to that in far-fault ground motion,but the range of isolation period narrowed.In order to low the impact extent between the base-isolated building and foundation pit in extreme near-fault ground motion,this paper presents the protection device and examines the necessity and validity of the protection measure by numerical calculating.更多还原