Research on restoring force model of composite walls with hidden frame

In order to study the seismic performance of composite walls with hidden frame and obtain the restoring force model which can consider the important parameters of dynamic characteristics of a structure or a member,different test parameters were designed and nine composite wall specimens with hidden frame were tested in five groups under horizontal low-cyclic loading.The failure mode of specimens was analyzed.Based on the test and analysis results,the restoring force model of the wall is established considering the effect of ductility,energy dissipation capacity,and strength and stiffness degradation as a function of the thickness,hidden frame and axial compression ratio variation of the wall.The hysteretic curves are obtained for the wall with various thickness,hidden frame and axial compression ratio.The thickness,hidden frame and axial compression ratio has an obvious influence on the composite wallls with hidden frame.The bearing capacity and deformation behavior of the wall with equally thick concretes on both sides are superior to that with unequally thick concretes.As the area and reinforcement of the hidden frame increase,the bearing capacity,ductility and energy dissipation capacity of the composite walls are greatly improved.But with the increase of the axial compression ratio,the deformation ability of the wall decreases.