钢-混凝土混合结构高层建筑抗震性能及时程分析影响因素

钢-混凝土混合结构在我国高层和超高层建筑中得到越来越广泛的应用,但相应的设计规范还不够完善,理论研究在一定程度上还落后于工程实践。采用SAP 2000程序对1栋15层的钢-混凝土混合结构原型进行了弹塑性时程分析,研究了结构的动力特性和结构在三水准烈度下的加速度、位移、层间位移角和楼层剪力反应,结果表明该结构具有良好的抗震性能。对比分析了原型结构在不同地震动输入下的抗震性能,分析表明有必要用几种不同地震波来研究混合结构的地震反应,在罕遇地震下,有必要进行混合结构在多维地震波输入下的地震反应分析。探讨了整体结构高宽比、核心筒高宽比和核心筒厚度等因素对混合结构抗震性能的影响,提出了混合结构的高宽比限值不大于规范规定混合结构高宽比限值的建议。

INFLUENCE FACTORS OF SEISMIC PERFORMANCE ANALYSIS AND TIME HISTORY ANALYSIS OF STEEL-CONCRETE HYBRID STRUCTURE FOR HIGH-RISE BUILDING

Steel-concrete composite structure in high-rise and super high-rise buildings in China has been increasingly widely used,but the corresponding design specifications are still not perfect,and theoretical research is also lagging behind in the practice. In this paper,SAP 2000 program was used to do the nonlinear time-history analysis of a 15 layers of steel-concrete composite structure to study the dynamic properties of the structure as well as the acceleration,displacement,story drift and floor shear response of the structure under three-level seism intensity. The result indicates that the structure has a good seismic performance. Comparative analysis of the structure under different seismic input shows that several different seismic waves need to be studied in the earthquake response of hybrid structures as well as the need for multi-dimensional seismic input analysis of hybrid structure seismic response. After discussing the effects of aspect ratio of overall structure and core tube as well as the thickness of core tube on the seismic performance of hybrid structure,it is suggested that the limted value of the aspect ratio of a hybrid structure should not be larger than the corresponding one specified by the code.