预应力装配整体式混凝土框架抗震性能试验研究

Experimental research of seismic behavior of assembled monolit PC frame

课题组提出了以预应力压接方式实现装配整体目标的高效、高预制装配率预应力框架结构体系——预应力装配整体式混凝土框架结构体系,并开展了系统研究。本文为研究其抗震性能,对一榀单层单跨预应力装配整体式混凝土框架结构进行了低周往复荷载试验,分析了其在低周往复荷载作用下的受力特点、破坏形态、延性和耗能能力等性能。试验结果表明:低周往复荷载作用下,框架梁两端钢筋首先屈服,并出现塑性铰,破坏形态与现浇结构类似;滞回曲线呈现较饱满的梭型形状,极限层间位移角达1/18,位移延性系数6.49,结构具有良好的塑性变形能力和耗能能力,表现出良好的整体性和抗震能力。

A prestressed frame structure system with high efficiency and high prefabricated assembly rate is proposed to realize the overall goal of assembly by prestressed pressing method,and the systematic research is carried out. In order to study the seismic performance of structure,a reversed cyclic loading test study is conducted on a single-story single-span prefabricated integrated PC frame structure. Seismic behaviors such as mechanical characteristics,failure mode,ductility and energy dissipation capacity of the frame are analyzed. The results show that under the reversed cyclic load,the steel bars at both ends of the frame beam yield firstly,and plastic hinges appear,which is similar to the failure mode of the cast-in-place structure. The hysteretic curves show a full shuttle shape,and the inter-story drift reaches 1/18,the displacement ductility coefficient reaches 6. 49. It has good plastic deformation ability and energy dissipation ability,and shows good integrity and earthquake resistance.