【作者】 刘小山；

【导师】 舒兴平；

【作者基本信息】 湖南大学 ， 结构工程， 2008， 硕士

【摘要】 钢框架-混凝土核心筒结构体系是近年来在我国迅速发展的一种结构体系,由于其在降低结构自重、减少结构断面尺寸、加快施工进度等方面的明显优点,已引起工业界和投资商的广泛关注。目前国外对该结构体系抗震研究较少,而国内的研究也不多。由于钢框架-混凝土核心筒结构中筒体相对强度、延性不足,刚度相对有余;外钢框架刚度相对不足,强度、延性相对有余,使钢与混凝土筒体的抗震性能不协调,它们不能合理地分担地震力,即不能形成双重抗侧力体系。目前研究的钢框架-混凝土核心筒结构体系中都不曾见在钢框架部分考虑加设支撑,而本文考虑了在钢框架部分加设偏心支撑。本文在高层钢框架-混凝土核心筒结构的外钢框架部分加设多列式并连偏心支撑、多列帽(或腰)连偏心支撑的。利用通用结构分析与设计软件ETABS plus C中文版9.0.0对未设支撑、设置偏心支撑、变化偏心支撑的位置和数量的高层钢框架-混凝土核心筒结构的地震反应特性进行了分析。根据《高层建筑混凝土结构技术规程》(JGJ3-2002 /J186-2002)关于结构计算分析的规定,先用振型分解反应谱法对该结构的自振周期、结构侧移、层间位移角、倾覆力矩比、各层总剪力、各层总弯矩、钢框架承担的剪力及剪力调整系数等指标进行了分析;再用弹性时程分析对该结构在四种不同地震波作用下的最大层间位移角和层位移曲线包络图、总剪力和总弯矩曲线包络图、楼层的最大加速度曲线包络图进行了补充分析。综合全文对带偏心支撑的高层钢框架-混凝土核心筒结构的地震反应特性进行的分析,在一定程度上评价该结构体系的抗震性能,并对该结构体系作进一步的研究提出了若干建议。更多还原

【Abstract】 Steel frame-concrete core tube structure system has been rapidly developed in recent years in china and has aroused widespread concern of investors and industrial circles,because of its obvious advantages such as reduction of self-weight and cross-section size, and speeding up the construction progress. At present there are few studies on the seismic properties of the structure in abroad, neither at home. because strength and ductility of the inner core tube are inadequate and stiffness relatively more than needed, however stiffness of steel frame is relatively not enough and strength and ductility adequate, as a result, the seismic performance of steel frame and concrete core tube lacks of coordination, which they neither reasonably contribute to earthquake nor form double side resistance system. Eccentrically braces have never been considered in the system at present, but additional eccentrically braces were considered in the steel framework in this paper.In this paper, additional several parallel out eccentrically braces and cap connection or waist connection eccentrically braces are considered in the high-rise structure system. So the analysis of seismic response properties of the system for three models such as without braces, with eccentrically braces and with eccentrically braces changed in the location and number has been carried out through structural analysis and design software ETABS plus C Chinese version 9.0.0. According to“high-rise building concrete structures technical code”(JGJ3-2002 / J186-2002) on the analysis of the structural calculations, firstly, vibration mode decomposition spectrum of the structure was carried out on the analysis of the natural vibration period, the displacement, inter-story drift angle, ratio of overturning moment, total shear for each floor, total moment for each floor, the shear undertaken by steel framework and shear adjustment factor and other indicators. Secondly, additional analysis was studied through flexible time-analysis of the structure under four different seismic waves on the envelope diagram of max inter-story drift angle and max story displacement curve, the envelope diagram of total shear and total moment curve and of the largest floor acceleration curve.In short, the seismic performance of the structure with eccentrically braces was analyzed and evaluated, and some recommendations are gived for further study.更多还原