受火后套筒灌浆连接装配式混凝土剪力墙抗震性能试验研究OA北大核心CSTPCD

In order to study the seismic performance of prefabricated concrete shear walls with sleeve grouting connection after exposure to fire,low-cycle reversed loading tests were conducted on four prefabricated concrete shear walls with sleeve grouting connection after fire,one cast-in-place shear wall contrast specimen after fire and one prefabricated shear wall contrast specimen with sleeve grouting connection at room temperature.The effects of fire durations,concealed column setting and sleeve grouting connection form on the failure mode,bearing capacity,stiffness,ductility,and energy dissipation of sleeve grouting connected concrete shear walls were studied.The test results show that compared with the shear wall connected with sleeve grouting under room temperature,the phenomenon of concrete collapse occurs during the low cycle reciprocating quasi-static loading process of shear walls connected by sleeve grouting after exposure to fire.For the shear walls connected with sleeve grouting exposed to fire for 60 min and 113 min,the bearing capacity decreases by 4.68％and 13.15％,respectively.The displacement ductility coefficient decreases by 2.56％and 7.73％,respectively,and the initial stiffness decreases by 9.92％and 27.73％,respectively.Under the same fire exposure time,the presence of concealed columns has almost no effect on the bearing capacity of sleeve grouting connected concrete shear walls after exposure to fire,but can increase stiffness,ductility,and energy dissipation capacity.Compared with the cast-in-place shear wall,the bearing capacity of the sleeve grouting connected shear wall after exposure to fire for 113 min is reduced by 20.72％,the initial stiffness is reduced by 9.33％,and the displacement ductility coefficient is increased by 4.68％.The energy dissipation capacity is better than that of the cast-in-place shear wall before yielding,and is worse than that of the cast-in-place shear wall after yielding.