土-隔震结构相互作用体系动力特性参数的简化分析方法  

SIMPLIFIED METHOD FOR CALCULATING DYNAMIC CHARACTERISTICS OF SOIL-ISOLATED STRUCTURE SYSTEM

作　　者：李昌平[1] 刘伟庆[1] 王曙光[1] 杜东升[1] 王海[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京211816

出　　处：《工程力学》2013年第7期173-179,共7页Engineering Mechanics

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

摘　　要：基于集总参数SR(sway-rocking)模型,建立隔震结构考虑土-结构相互作用(SSI)影响的简化分析模型,并经严格推导得到了模型动力特性参数的计算公式,由此可将常规非隔震结构的简化分析方法延伸到隔震结构的相互作用分析。通过算例分析,与复模态分析方法进行了对比。对比结果表明,该文提出的计算公式对绝大多数工程场地都有很好的适用性,但是相比复模态方法该文方法更加简单实用。算例分析同时表明SSI对于高层隔震结构的影响比中低层结构大。该文提出的简化计算方法是隔震结构初步设计评估SSI效应的简便有效的工具,同时为隔震结构考虑SSI效应的基于反应谱理论的设计方法研究奠定基础。A simplified analysis model of base-isolated structure considering soil-structure interaction （SSI） is proposed based on an SR （sway-rocking） model. Rigorous and closed-form formulas for dynamic characteristic parameters are derived. In essence, the proposed methodology is an important extension of the simplified methodology for the case of non-isolated structures. The results of the proposed methodology were compared with the corresponding ones of the relatively rigorous complex eigenvalue approach with examples. And the results of comparison indicated that the proposed formulas can be applied in most engineering site conditions. However, the proposed method is more simple and practical. It is also shown that the SSI effects are more pronounced for high-rise structures in comparison to the low-rise ones. The proposed methodology can provides a concise and effective way of evaluating SSI effects on isolated structures in the schematic design phase, laying the groundwork for the study of the design method of isolated structures considering soil-structure interactions.

关 键 词：基础隔震 土-结构相互作用 简化分析 动力特性 地震反应 

分 类 号：TU352.1[建筑科学—结构工程]