钢框架核心筒结构与岩溶地基-桩筏基础共同作用地震响应分析-结构工程专业论文.docxVIP

波从基岩传至地表被放大，使上部结构的动力响应增大，另外，地基和桩 波从基岩传至地表被放大，使上部结构的动力响应增大，另外，地基和桩 筏基础在地震作用下与上部结构一起运动，使上部结构变形的协调性更好， 上部结构的位移增大，层问位移角减小。 (4)分析了桩问土弹性模量和桩径对共同作用体系地震响应的影响。 结果表明：在一定范围内，随着桩间±弹性模量增大，上部结构和桩筏基 础的地震响应减小：上部结构的动力响应对桩径的变化不敏感，桩的弯矩 和剪力与桩径的变化趋势相同。 (5)建立岩溶地基一桩筏基础一带加强层钢框架核心筒结构共同作 用模型，分析加强层数量和加强层刚度对结构地震响应的影响。结果表明： 上部结构的层间位移角和位移随着加强层数量的增多而减小，加强层数量 越多，上部结构层间位移角和位移减小的效率越低；设置加强层的部分， 层间位移角发生突变；加强层刚度增大，上部结构的位移和层间位移角总 体减小，但减小的程度十分有限。因此，加强层的数量和刚度要适当。 关键词：岩溶地基桩筏基础钢框架核心筒结构 共同作用 地震响应 万方数据 SEISMIC SEISMIC RESPoNSE ANALYSIS ON STEEL FRAME CoRE TUBE STRUCTURE AND CARST SoIL．PILE RAFT FoUNDATIoN INTERACTIoN ABSTRACT There is vast area land and diverse geological sites in China，with the acceleration of urbanization，constructing high-rise building on complex geological sites is inevitable；in recent years，the earthquake disaster occurred many times in China，which results in large personnel casualties and property losses；currently,the maj or high—building design methods in carst area are conventional method(espectively analysis superstructure，foundation and foundation)and experience，the results of conventional design methods are different from the actual situation largely．Therefore，the seismic response analysis on high—rise building in karst region basis and foundation interaction system is for further study． In this paper,the carst soil--pile raft foundation--core tube steel frame structure interaction model is established to conduct the following studies on the interaction system using the numerical simulation method： (1)Research results and development status of the interaction system at home and abroad is stated，and relevant review is done to get a brief summary of the characteristics of engineering geology and seismic characteristics in karst area．The red clay is the most typical soil in carst area，carbonate rock is widely 万方数据 distributed distributed where large and small soil grooves and soil caves present，in the actual proj ect，appropriate measures are taked to deal with this special geologic