高层建筑框架—核心筒混合结构地震能量反应及损伤评估

发布时间：2018-03-31 11:32

本文选题：框架-核心筒混合结构　切入点：拟速度谱　出处：《西安建筑科技大学》2013年硕士论文

【摘要】：高层建筑框架-核心筒混合结构是目前我国高层建筑中一种主要的结构形式,其地震破坏机理和抗震性能是国内外研究的热点；基于能量的地震反应分析方法与抗震设计方法概念明确、形式简单,并考虑了结构累积滞回耗能以及由地震动持续时间引起的结构构件累积损伤破坏因素。目前,针对高层框架-核心筒混合结构的地震能量反应分析研究还很少,开展基于能量方法的高层框架-核心筒混合结构地震反应分析和抗震性能评估研究具有重要的理论意义。为此本文做了以下研究工作。首先通过振型分解理论推导了弹性多自由度体系总输入能量方程,证明了多自由度体系总输入能量可由对应多阶等效单自由度体系的总输入能量之和来表达,通过大量的时程分析算例论证了此方法的正确性。其次,基于MPA方法与弹性拟速度谱、现有弹塑性总输入能量谱建立了高层框架-核心筒混合结构弹性与弹塑性总输入能计算方法,通过大量弹塑性时程分析说明了按照本文方法可对框架-核心筒混合结构弹性与弹塑性总输入能做以较为精确的估计。研究表明,在计算弹性或弹塑性结构总输入能量时都不能忽略高层结构的高阶振型对总输入能量的贡献,否则可能很大程度上低估结构的总输入能量。再次,运用弹塑性分析程序Perform-3D对9个考虑了不同结构构件参数的框架-核心筒混合结构进行数值建模并进行大量的弹塑性时程分析,研究了地震动参数和结构参数对结构滞回耗能比例的影响,获得了考虑结构动力特性以及地震动特性的框架-核心筒混合结构滞回耗能比公式。分析了滞回耗能在结构各构件中的传递、分配规律以及沿结构高度方向的分布规律,确定了框架-核心筒混合结构不同构件的滞回耗能分配比例以及沿结构高度方向的分布计算公式。最后,基于本文分析得到的结构位移和滞回耗能分配公式计算得出的累积滞回耗能,按照两种基于能量和位移双重破坏准则和一种基于能量单参数损伤指标分别对两个框架-核心筒混合结构的抗震性能进行评估,分析结果表明仅采用位移单参数指标对高层框架-核心筒混合结构进行抗震性能的评估是不足的,应该考虑构件累积耗能对结构损伤的影响。
[Abstract]:The frame-core tube hybrid structure of high-rise building is one of the main structural forms in our country at present. The seismic failure mechanism and seismic performance of the composite structure are the focus of research at home and abroad. The energy-based seismic response analysis method and seismic design method have clear concept and simple form, and take into account the cumulative hysteretic energy dissipation of structures and the cumulative damage and failure factors of structural members caused by the duration of ground motion. The seismic energy response analysis of high-rise frame-core-tube hybrid structures is rare. It is of great theoretical significance to carry out seismic response analysis and seismic performance evaluation of high-rise frame-core-tube hybrid structures based on energy method. Firstly, the total input energy equation of elastic multi-degree-of-freedom system is derived by mode decomposition theory, and it is proved that the total input energy of multi-degree of freedom system can be expressed by the sum of the total input energy of the corresponding multi-order equivalent single-degree-of-freedom system. The correctness of the method is proved by a large number of examples of time history analysis. Secondly, based on the MPA method and elastic pseudo velocity spectrum, The total elastoplastic input energy spectrum has been established to calculate the elastic and elastoplastic total input energy of a high-rise frame-core tube hybrid structure. Through a large number of elastic-plastic time-history analysis, it is shown that the elastic and elastoplastic total input energy of frame-core-tube hybrid structures can be estimated more accurately according to the method presented in this paper. In calculating the total input energy of elastic or elastoplastic structures, the contribution of higher-order modes of tall structures to the total input energy cannot be ignored, otherwise the total input energy of the structure may be underestimated to a large extent. The elastoplastic analysis program Perform-3D is used to model nine frame-core-tube hybrid structures with different structural member parameters and a large number of elastic-plastic time-history analysis are carried out. The effects of ground motion parameters and structural parameters on the hysteretic energy consumption ratio of structures are studied. The hysteretic energy dissipation ratio formula of frame-core tube hybrid structure considering the dynamic characteristics of the structure and the ground motion characteristics is obtained. The transfer, distribution and distribution of hysteretic energy in each member of the structure are analyzed, as well as the distribution law along the height of the structure. The distribution formula of hysteretic energy consumption of different members of frame-core-tube hybrid structure and its distribution along the direction of structure height are determined. Based on the calculation of displacement and hysteretic energy distribution formula in this paper, the cumulative hysteretic energy dissipation is obtained. According to two failure criteria based on energy and displacement and one damage index based on energy single parameter, the seismic performance of two frame-core-tube hybrid structures is evaluated. The results show that it is insufficient to evaluate the seismic performance of high-rise frame-core-tube composite structures only by using displacement single parameter index, and the effect of cumulative energy dissipation on structural damage should be considered.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.31

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