隔震结构基于功率谱密度函数法的楼层反应谱分析  

Floor response spectra analysis of base-isolated structure based on PSDF

作　　者：曾奔[1,2] 周福霖[2] 徐忠根[2] 

机构地区：[1]西安建筑科技大学,西安710055 [2]广州大学工程抗震研究中心,广州510405

出　　处：《振动与冲击》2009年第2期36-39,71,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50608021);科技部重大基础研究前期研究专项(2004CCA03300)

摘　　要：采用锥体模型求得地基基础阻抗函数,推导出非结构构件(NSC)的绝对加速度传递函数,利用随机振动理论,通过功率谱密度函数法(PSDF)建立楼层反应谱(FRS),并和人工合成地震波分析所得结果进行了对比。研究结果表明,PSDF法用较少计算量就可以得到相当准确的FRS,同时能与现行抗震规范很好的相结合。基础隔震结构NSC的峰值反应主要出现在隔震频率附近的低频段,增加隔震装置后土-结构相互作用(SSI)出现不同程度的削弱,在隔震频率段最为显著。The transfer function of absolute acceleration response of non-structure component(NSC) supported on a base-isolated structure was presented.The base flexibility was assumed to be described by complex-valued impedance function calculated by cone model.The proposed formulation was used to generate the FRS by power spectrum density function(PSDF) according to random vibration theory,which was then compared with the FRS obtained by the time history analysis.The results show that the method of PSDF provides satisfying FRS with far less effort and has good agreement with current seismic code.The peak acceleration of NSC appears in low frequency band(near base-isolated frequency),and the use of base-isolated device may weaken the effect of soil-structure interaction(SSI),especially in the base-isolated frequency band.

关 键 词：非结构构件 基础隔震 功率谱密度函数 楼层反应谱 土-结构相互作用 

分 类 号：TU352.12[建筑科学—结构工程]