脉冲型地震下隔震结构的等强度位移需求谱研究  

Constant-strength displacement demand spectra of base-isolated structures under pulse-like ground motions

作　　者：王亚楠[1] 杜永峰[2] 胡高兴 WANG Yanan;DU Yongfeng;HU Gaoxing(School of Civil Engineering, X i’ an Technological University, X i’ an 7 1 0 0 2 1,China;Institute of Earthquake Protection and Disaster Mitigation,Lanzhou 730050, China)

机构地区：[1]西安工业大学建筑工程学院,西安710021 [2]西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《振动与冲击》2018年第1期85-89,110,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51178211);西安工大校长基金(XAGDXJJ15021)

摘　　要：隔震支座在脉冲型地震作用下将经历很大变形,容易发生拉裂、失稳等破坏,利用等强度位移需求谱对隔震支座的最大非弹性变形进行估算简单、高效。以脉冲型地震记录作为激励,对基础隔震结构在脉冲型地震作用下的等强度位移需求谱进行研究。首先,采用Bouc-Wen模型描述隔震支座的非线性力-变形关系,建立了隔震结构等强度位移需求谱的相关运动方程;然后,运用MATLAB对运动方程进行编程并求解,得到基础隔震结构的等强度位移需求谱;最后,通过数值拟合建立了等强度位移需求谱的数学表达式,利用该表达式可以对隔震支座的最大非弹性变形进行快速估算,便于工程应用。An isolation bearing would experience large deformation under pulse-like ground motions,and this may cause isolation bearing ＇s cracking or instability. Using constant-strength displacement demand spectra to evaluate the maximum inelastic deformation of the isolation bearing is a very simple and effective method. The constant-strength displacement demand spectra of base-isolated structures were studied taking near-fault pulse-like ground motions as inputs. The nonlinear mechanical characteristics of the isolation bearing were represented by the Bouc-Wen model,and the relevant motion equations with respect to the constant-strength displacement demand spectra of base-isolated structures were established. The software MATLAB was used to solve these motion equations,and the constant-strength displacement demand spectra of base-isolated structures were obtained. At last,the constant-strength displacement demand spectra ＇s mathematical expression was established by numerical fitting. This expression can be used to evaluate the isolation bearing＇s maximum inelastic deformation quickly,and is easy to be applied in engineering practice.

关 键 词：脉冲型地震动 基础隔震结构 等强度位移需求谱 

分 类 号：TU311.3[建筑科学—结构工程]