Seismic Performance Research On Composite Shear Wall With Different Steel Forms

As a kind of effective lateral-resistance member,composite shear wall makes full advantages of concrete and steel and is widely used in high-rise and super high-rise buildings as a consequence.In skyscrapers specially,the heavy vertical load makes it nearly impossible to merely use ordinary reinforced concrete shear wall without increasing wall thickness to the extent which is unacceptable to the architect.Therefore,steel plate and shaped steel is often introduced to be embedded in the concrete all to lower the axial compressive ratio of the whole shear wall,thus becoming the composite shear wall.Code for design of composite structures(JGJ138-2016)in our country clearly demonstrates calculation method of bearing capacity and details for two kinds composite shear wall,namely,shaped steel concrete composite shear wall and steel plate concrete composite shear wall.For the latter kind of composite shear wall,which is extensively used in high-rise buildings in our country,is often fabricated with high-strength concrete.And this kind of concrete produces a large amount of heat of hydration during its condensation and hardening,which in return,generates considerable shrinkage deformation in the concrete body.With the strong constraint of steel plate,the shrink of concrete is not so free that produces intense tensile stress and vertically distributed cracks in the concrete wall.By means of the ANSYS software,this article analysed the influence of creating several different kinds of verticle slits and distributed circular holes in the steel plate on the shrink stress and put an idea that verticle slits in the steel plate can significantly reduce the tensile shrink stress of the concrete wall.The author used the ABAQUS software to analyze 5 different forms of composite shear wall(including ordinary concrete shear wall,shaped steel concrete composite shear wall,steel plate concrete composite shear wall,slotted steel plate concrete composite shear wall,scattered shaped steel concrete composite shear wall)under monotonous and cyclic loading with a variety of changing parameters(aspect raito,axial pressure ratio,etc.).According to Code for design of concrete structures(GB50010-2010),Technical specifications for concrete structures of tall building(JGJ3-2010)and Code for design of composite structures(JGJ138-2016),3 types of composite concrete shear wall(ordinary concrete shear wall,shaped steel concrete composite shear wall,steel plate concrete composite shear wall)were calculated and evaluated for their bearing capacity and failure mode,and the results were compared with the numerical outcome.A typical 33-storey super high-rise building was initially analysed and designed according to the current codes and specifications in China with the help of YJK——a structure design software universally used among structural engineers in China.And the preliminary design results were imported into the PERFORM-3D softeware to execute a dynamic analysis based on the fiber section model built in PERFORM-3D.Three selected seismic waves(2 natural and 1 artificial)were entered into the program to simulate rare earthquake conditions under a seismic precautionary intensity of 7 provided by the Code for seismic design of buildings(GB50011-2010).Different kind of menbers in the structure were evaluated for their performance according to the monitored strain defined in steel fiber.Another analysis was carried on to replace the circumferential ordinary shear wall of the core tube with shaped steel concrete composite shear wall and the 2 situations were compared for their influence on anti-sesimic performance of the structure.