考虑SSI效应的黏弹性阻尼器减震框架结构体系的简化分析  

Simplified analysis method for energy dissipated frame structures with visco-elastic dampers considering SSI effects

作　　者：赵学斐 王曙光[1] 杜东升[1] 刘伟庆[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京211800

出　　处：《南京工业大学学报（自然科学版）》2017年第4期102-110,共9页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金重大研究计划(90815017);土木工程防震减灾国家重点实验室开放课题(SLDRCE10-MB-06)

摘　　要：首先在频域中建立了考虑SSI效应的黏弹性阻尼器减震结构的动力平衡方程,通过模态应变能法计算出上部结构的振型频率与振型阻尼比,忽略阻尼器对结构振型的影响,并基于上部结构振型正交性假设对控制方程进行解耦,将原SSI减震结构体系等效为固定基础上的串联质点系模型,采用经典的振型分解法求解结构体系的地震反应。通过数值算例验证了简化方法的可靠性并研究了黏弹性阻尼器性能受SSI效应的影响。结果表明:当结构自由度较多时,采用本文简化方法在保证计算精度的同时可以很大程度地提高计算效率;当考虑SSI效应后,黏弹性阻尼器对结构的控制效果与固定基础相比有所不同。本文提出的简化分析方法可快速地分析建立在软土地基上的黏弹性消能减震结构地震反应。The dynamic equilibrium equation of structures with visco-elastic dampers under the consideration of SSI effects was established in this paper.The modal frequency and modal damping ratio of the super-structure were obtained through modal strain energy method（ MSEM）,then the original SSI energy-dissipated system can be simplified as the series mass system model on fixed base by ignoring the effect of dampers to the structure＇s original modal shape,which was considered to be orthogonal,then the earthquake response of the system can be calculated through classical modal analysis method. The numerical examples were conducted to validate the accuracy of the simplified procedure.The performance of VEDs influenced by the SSI effect was also studied. The results show that the method can greatly improve calculation efficiency without losing much accuracy for structures with large number of freedoms;the control effect of the VEDs for fixed base conditions differed much from the soft soil foundation. In general,the numerical simplified procedure has a good application value for fast estimating earthquakeresponse or pre-design of structures with visco-elastic dampers considering SSI effect.

关 键 词：模态应变能法 SSI效应 黏弹性阻尼器 简化分析 

分 类 号：TU352.12[建筑科学—结构工程]