中文摘要：

我国现行建筑抗震设计规范中对于隔震结构分析时地震动的单双向输入问题并无明确说明。鉴于高层隔震结构及隔震支座体系的特殊性,本文对西昌（9度区）某高层隔震结构进行分析,选取了7组地震动,比较了双向地震动输入与单向地震动输入相比后该高层隔震结构的加速度、位移、支座应力等响应的差别。研究发现高层隔震结构的四个角部支座在单向地震动输入下拉、压应力未超过规范规定限值,而在双向地震动输入下均超过规范规定限值。针对双向输入时隔震支座出现的应力超限问题,提出了解决方案。建议在对隔震结构尤其是高层隔震结构进行计算分析时,采用双向地震动输入并加强抗拉支座的研发工作。

英文摘要：

In the Code for Seismic Design of Buildings in China, there are no specifications that unilateral or bilat- eral ground motion should be input when isolated structures are analyzed. Considering the complexity of high-rise isolated structures and isolation bearings system, the study on a high-rise isolated structure in Xichang （ seismic for- tification intensity 9） was conducted. Seven groups of earthquake ground motions were selected, and the seismic responses （acceleration, displacement, stress of isolators） of the structure were compared when the structure is subjected to unilateral and bilateral ground motion excitations. It is found that the tensile and the compressive stress of the comer isolators exceed the code limitations under bilateral ground motion inputs while they don＇t exceed the limitation under unilateral inputs, and some solutions are proposed to solve the problem. When isolated buildings, especially high-rise isolated buildings are analyzed, bilateral ground motions are suggested to be input, and more efforts should be made on the study of tensile-resistant isolators.