Abstract
This paper experimentally investigated the seismic behavior of a 1:5 reduced-scale model of concrete-encased steel frame-reinforced concrete core tube building. The quasi-static testing with multipoint loading was carried out, and mode-superposition response spectrum method was adopted to control the amplitude of displacement. The damage process, crack pattern, and failure mode were observed. Various parameters were obtained, including lateral deformation, hysteretic characteristics, strain distribution, ductility, and energy dissipation capacity. The test revealed the distributions of base shear between the core tube and frame. The result indicated that the core tube bears major loading and exhibited overturning failure, afterwards frame carry the surplus load and exhibited column tensile failure and joint panel shear failure. The characteristic of two seismic resistant systems are reflected by the excellent cooperation of core tube and frame.
Highlights
Concrete-encased steel frame-reinforced concrete core tube (CS frame-RC core tube) buildings are becoming increasingly popular around the world in high-rise buildings [1,2,3]
This composite structural system consists of columns located on the periphery of the building and tube located on the center of the building
Compared with RC frame structure, the bearing capacity of this composite structural system is obviously improved, and the lateral deformation of the building can be limited to an expected level
Summary
Concrete-encased steel frame-reinforced concrete core tube (CS frame-RC core tube) buildings are becoming increasingly popular around the world in high-rise buildings [1,2,3]. The first line of defense is RC core tube with high lateral stiffness; it will bear most of the shear force caused by the horizontal earthquake. Lateral force caused by earthquake is expected to resist by both frame and core tube through composite action. Because there are remarkable differences in stiffness between frame and core tube [23, 24, 26], the frame columns may fail by shear and crush in resisting strong earthquakes and eventually leads to sudden collapse of whole structure [27, 28]. A 1:5 reduced-scale model of concreteencased steel frame-reinforced concrete core tube building is constructed, and quasi-static testing is conducted to assess the response under axial compression and cyclic horizontal load. The function of two seismic resistant systems of this structure is verified
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