设置负刚度装置的基础隔震结构动力特性和地震响应研究  

Dynamic characteristics and seismic response of base-isolated structures with negative stiffness devices

作　　者：黄潇 刘方玲 胡志祥[2] 王冬花 HUANG Xiao;LIU Fangling;HU Zhixiang;WANG Donghua(School of Civil Engineering,Anhui Jianzhu University,Hefei 230601,Anhui,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]安徽建筑大学土木工程学院,安徽合肥230601 [2]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《地震工程学报》2024年第5期1021-1031,1083,共12页China Earthquake Engineering Journal

基　　金：国家自然科学基金资助项目(52178283);安徽建筑大学科研基金资助项目(2020QDZ17)。

摘　　要：在基础隔震结构的隔震层设置负刚度装置可调节结构动力特性及抗震性能。针对隔震层设置预压弹簧导致的非线性问题,首先采用泰勒级数展开对力-位移关系进行线性拟合,并对比研究设置预压弹簧纯负刚度元件(PNS)和阻尼负刚度装置(NSD)的基础隔震结构频域响应特性。进一步,利用小波分析对实际近断层地震激励进行时频分析,并采用解析模式分解方法将地震动分解为高频和低频成分,并分别计算高频地震波和低频地震波作用下设置PNS和NSD对基础隔震结构地震响应的影响。结果表明,与未设置负刚度装置的基础隔震结构相比,设置PNS会使得高频激励下的位移和加速度响应减小,但是低频激励下的位移和加速度响应会增大;而设置NSD不仅可以大幅降低基础隔震结构的位移和加速度频响函数峰值,并且能在很宽的频段范围内减小基础隔震结构的位移响应。Setting a negative stiffness device in the isolation layer can adjust the dynamic characteristics and seismic performance of base-isolated structures.The force-displacement relationship was linearly approximated by Taylor series expansion to address the nonlinearity problem caused by the preloaded spring in the isolation layer and the frequency response characteristics of base-isolated structures with a pure negative stiffness(PNS)element and a damping negative stiffness device(NSD)were compared and studied.Furthermore,the wavelet analysis was used to perform the time-frequency analysis on actual near-fault earthquakes,and the analytical mode decomposition method was used to decompose the ground motion into high-and low-frequency components.The effects of PNS and NSD on the seismic response of base-isolated structures under high-and low-frequency seismic waves were then compared.Compared with the base-isolated structure without NSD,results show that setting PNS can reduce the displacement and acceleration responses under high-frequency excitation but increase the displacement and acceleration responses under low-frequency excitation.Setting NSD not only markedly reduces the peak values of displacement and acceleration frequency response functions of base-isolated structures but also minimizes the displacement response of base-isolated structures in a wide frequency range.

关 键 词：基础隔震结构 负刚度 频响特性 解析模式分解 地震响应 

分 类 号：TU352.1[建筑科学—结构工程]