Study On Seismic Performance Of Steel Reinforced Concrete Columns Subjected To Low-cycle Repetitive Torque

The composite structures of steel reinforced concrete are widely used as a new type of structures in high-rise buildings and super high-rise buildings.Moreover,the seismic performance of the structure is concerned with the rapidly development.Firstly,investigate the seismic performance of reinforced concrete structure when suffering recycled low-period load.Secondly,build the modle of steel reinforced concrete member under compression and torsion by using ABAQUS software,and analyze hysteretic curve,changing law of rigidity degeneration,energy dissipation capacity and ductility according to numeric results.what’s more,study the seismic performance of steel reinforced concrete member when suffering recycled low-period load under different influential factors.The main aspects in this paper include:(1)Build numerical model of column of steel reinforced concrete according to the experiments in relevant thesis to calculate.The calculated results are correspond with the experiment literally,which instructs the numerical models in this paper are correct and available.(2)In order to simplify the calculation and improve the operation rate,the constitutive structure of the steel adopts the complete elastic-plastic double straight line model.Take six members of box-section steel reinforced concrete as subject investigated,and choose available type of element,constitutive model,attributes to simulate the member of steel reinforced concrete.The member subjected to constant axial compress and recycled torque.This paper proposals the method of applying recycled torque by changing the amplitude of corner.(3)Analyze seismic performance of the member of steel reinforced concrete under the circumstances of suffering recycled torque with low period considering axial compression ratio,stirrup spacing,dimension of steel reinforced concrete and ratio of reinforcement.Acquire hysteretic curve and the changing law of rigidity degeneration,energy dissipation capacity,ductility under different influential factors.(4)From the above investigation,acquire the conclusion that axial compression ratio is the most important parameter for ductility,and the ductility weaken with the increase of axial compression ratio.Therefore,it’s necessary to control the magnitude of axial compression ratio.The member rigidity can be restrained by increasing the size of steel at some extend,so it’s a vaild measure to improve seismic performance by increasing the size of steel.The stirrup spacing and ratio of reinforcement have slight inference in seismic performance,but it have somewhat benefits in improving seismic performance of steel and structures to decrease stirrup spacing or increase ratio of reinforcement.