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针对工程中采用的钢梁SRC柱框架-型钢混凝土核心筒混合结构的抗震性能进行了试验研究。设计并完成了一幢17层的1∶10模型结构,并对其进行了不同地震工况下振动台试验。分析了该结构体系固有动力特性以及在不同类型、不同强度水准的地震动输入下位移、速度、加速度响应及破坏机理;研究了布置于钢筋混凝土核心筒内的型钢框架对结构整体抗侧能力及变形性能的影响。结果表明:在不同类型、不同强度的地震动作用下,该结构体系的破坏始于型钢混凝土核心筒与外部钢梁SRC柱框架连接节点处,而后向核心筒体内部连梁发展,最终扩展到核心筒体。在核心筒体混凝土局部出现严重开裂破坏后,内置的型钢框架及外部的SRC钢梁框架仍处于弹性工作状态,表明该结构体系可实现多道防线的抗震设计目的且传力途径明确,抗震性能良好。
The seismic performance of SRC column frame-steel reinforced concrete core-tube hybrid structure used in the project was studied. A 17-layer 1:10 model structure was designed and completed, and the shaking table tests under different seismic conditions were carried out. The inherent dynamic characteristics of the structural system and the displacement, velocity and acceleration response and failure mechanism under different types and intensities of ground motions are analyzed. The effect of profiled steel frame placed in the core of reinforced concrete on the overall lateral resistance and Deformation properties of the impact. The results show that under different types and intensities of ground motions, the failure of the structural system begins at the connection point of SRC column frame of SRC core tube and outer steel beam, and then develops into the internal beam of SRC column and finally extends to Core barrel. After the severe cracking and failure of the core concrete, the internal steel frame and the external SRC steel beam frame are still in elastic working condition, which shows that the structural system can achieve the purpose of aseismic design of multi-line of defense and has a clear force transmission path and seismic performance good.