高层钢—混凝土混合结构弹塑性动力时程及能量反应分析

【作者】 秦素娟；

【导师】 陆铁坚；

【作者基本信息】 中南大学 ， 结构工程， 2008， 硕士

【摘要】 目前,钢-混凝土混合结构被大量应用于我国的高层建筑特别是超高层建筑结构中,而我国是多地震国家,对混合结构体系进行抗震性能的研究具有重大意义。因此,本文主要针对高层混合结构体系中常用的外钢框架-内混凝土核心筒混合结构进行了地震作用下的弹塑性动力反应及能量反应分析,主要研究内容如下:(1)建立了高层钢-混凝土混合结构的三维空间有限元分析模型,并对其自振特性进行了分析。(2)对高层钢-混凝土混合结构模型进行了地震作用下的弹塑性动力反应分析,得到结构在不同地震烈度下的顶层位移时程、加速度时程、楼层位移及层间位移角反应,研究了地震作用下混合结构的开裂、屈服与破坏情况。通过对不同地震波作用下结构的动力反应对比分析知,输入地震波的频谱特性对结构的动力反应影响相当明显。(3)对高层钢-混凝土混合结构模型进行了地震作用下的能量反应分析,选取不同的地震动参数对混合结构的总输入能及其分配情况以及混合结构的滞回耗能分布情况进行了研究。通过研究知,地震反应的能量分析方法是一种能较好反应混合结构在地震作用下的地震反应全过程及其弹塑性性能的方法。(4)通过对地震作用下混合结构的弹塑性动力反应分析结果和能量反应分析结果进行对比分析知,抗震设计中仅考虑结构的位移反应采用位移单一性能指标对混合结构进行抗震性能的评估是不够全面和安全的,提出应同时补充对结构的耗能反应分析来评估混合结构抗震性能的建议。更多还原

【Abstract】 At present, the steel-concrete hybrid structure has been widely used in the construction of high-rise buildings in China, a nation with high activity and high-frequency of earthquakes. So the research of antiseismic behavior of steel-concrete hybrid structure is of great significance. In this paper, the elastoplasitic dynamic analysis method and the energy response method are used to research the seismic response of external steel frame and internal concrete core tube mixed structures under earthquake actions. The main contents are as follows.(1) A three-dimensional finite element analysis model of high-rise steel-concrete hybrid structure is established, and its natural vibration characteristic is analyzed.(2) Through the elastoplasitic dynamic analysis of steel-concrete hybrid structure under different earthquake inputs, the displacement-time history response of top floor, acceleration time history, maximal floor displacement and inner-story drifts ratio of the structure are obtained. The character of its crack development, yielding mechanism and failure situation are also discussed in detail. Through comparative analysis of the structure’s dynamic response under different earthquake inputs, it is found that the spectral characteristics of the input seismic wave have significant influence on the dynamic response of steel-concrete hybrid structure.(3) By way of energy response analysis of the steel-concrete hybrid structure, this paper discusses the earthquake total input energy of the structure under different ground motion parameters, and the regularity of the total input energy between hysteretic energy and damping energy. Through the research, it is found that the energy responses analysis method is quite effective to reflect the seismic response process and the elastoplastic performance of the steel-concrete hybrid structure under earthquake inputs.(4) Contrasting the different results obtained by elastoplasitic dynamic analysis method and energy response analysis method, it is found that it’s not comprehensive to assess the seismic behavior of steel-concrete hybrid structure by unitary displacement index. And the suggestion of supplementing energy analysis in evaluating the seismic behavior of steel-concrete hybrid structure is put forward.更多还原