设置多功能摩擦摆系统的单层球面网壳结构地震响应分析

Seismic response analyses of a single-layer spherical lattice shellstructure with a multifunctional FPB system

提出了一种新型多功能摩擦摆支座(MFPB),考察了其在周边支承单层球面网壳结构中减震控制性能。上诉隔震装置由摩擦摆支座、形状记忆合金(SMA)拉索和套筒式限位器组成;为了研究MFPB的隔震耗能机理,建立了此隔震支座的理论模型,进而,对MFPB的滞回行为进行了数值模拟,并分析了其性能特征;将MFPB隔震系统引入单层球面网壳结构中,基于ABAQUS软件建立了受控结构的分析模型;对结构进行了非线性时程分析,利用结构的动力响应指标,评估了受控和无控网壳的抗震性能。研究结果表明,所研发的新型隔震系统可有效降低结构的多维地震响应,且具备抵抗强震灾变的潜力,故有助于提升高位隔震空间网壳结构的总体抗震性能。

This study proposed a new type of multifunctional friction pendulum bearing(MFPB)and examined its effectiveness in reducing and controlling seismic response of spherical lattice shell with surrounding columns.The MFPB consists of friction pendulum bearing(FPB),shape memory alloy(SMA)cables and sleeve restrainers.To investigate the mechanism of isolation and energy dissipation,the mechanical model of the new isolator were described.Furthermore,the hysteresis behavior of the MFPB was investigated with numerical simulations and the characteristics of such an isolation device were analyzed.Next,the MFPB devices were introduced in a single-layer spherical lattice shell structure with surrounding columns.An analytical model of the controlled structure was constructed through ABAQUS software.Finally,nonlinear time-history analyses were conducted to evaluate seismic performance of controlled and uncontrolled lattice shells using a set of dynamic response indices.The results show that the developed isolation system can effectively control structural responses under horizontal and vertical seismic excitations and possess the potential in disaster resistance under strong earthquakes,which assists high-position isolated spatial lattice shell structures in improving their comprehensive seismic behavior.