SRC框架-型钢混凝土核心筒混合结构振动台试验研究

Shaking table test on hybrid structure with SRC frame and steel frame strengthened concrete core tube

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。

Seismic performance of a hybrid structure with SRC frame and steel frame strengthened concrete core tube was carried out with shaking table test. A 1：10 scaled model with 17 floors for this structural system was designed and tested to obtain comprehensive anti-seismic performance corresponding to several seismic waves. Both dynamic characteristics and responses of acceleration, velocity, deformation and failure mechanism, cracking pattern for model structure were discussed. Effect of steel frame in core tube on the whole lateral capacity and deformation performance was analyzed. The results show that main cracks of this structural system originate at the joint connections between outer steel strengthened frame and core tube for different types and intensity of ground motion, and then develop to the coupling beams at the core tube. Steel frame in core tube and SRC frame part are both kept in elastic condition after serious damages occurred in shear walls. The whole structure system could form a second seismic fortification easily with definite force transmission mechanism and has a good seismic performance.