带偏心支撑钢框架-混凝土核心筒结构抗震性能研究

Research on the Seismic Performance of Steel Frame-concrete Core Tube Structures with Eccentrical Braces

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、多列帽腰连偏心支撑,采用结构分析与设计的通用有限元分析软件对未设支撑、设置偏心支撑、改变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.利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研究.根据分析结果提出了高层钢框架-混凝土核心筒结构抗震设计的偏心支撑分布方式和帽腰支撑设置的原则,为实际工程设计提供了理论参考.

Several additional parallel out eccentrical braces and cap connection or waist connection eccentrical braced were considered in thehigh-rise structure system. The seismic response properties of the system for three models： the one without braces, the one with eccentrical braces, and the one with eccentrical braces in the loca- tion and number, were carried out through general finite element software. The vibration mode decomposition spectrum of the structure was carried out through the analysis of the natural vibration period, the displacement, the inter-story drift angle, the ratio of overturning moment, the total shear for each floor, the total moment for each floor, the shear undertaken by steel framework, the shear adjustment factor and other indicators. The resuits provide a reference for the design of the distribution of several additional parallel out eccentrical braces and the set-up of the cap connection or waist connection eccentrically braced of steel frame-concrete core tube structure in the future.