无粘结预应力楼盖框架体系的静力弹塑性分析

在介绍SAP2000对于pushover分析的步骤及参数设置的基础上,利用SAP2000对抗震设防烈度为8度的8层大跨无粘结预应力楼盖框架结构和类似的钢筋混凝土结构进行了pushover分析。从结构的基底剪力-顶点位移曲线、结构的性能点值、结构的塑性铰发展情况等多方面对这两类结构进行了对比分析,以探求此种预应力楼盖框架结构体系的抗震性能。理论分析和算例结果表明:对于层数适中、结构布置较规则的无粘结预应力楼盖框架结构体系与类似的钢筋混凝土结构相比,其具有较大的开裂后结构刚度、较高的结构极限承载能力及抗震性能良好的梁铰破坏机制。

PUSHOVER ANALYSIS OF FRAME STRUCTURES WITH UNBONDED PRESTRESSED FLOOR

It is firstly introduced the steps and parameters setting of the pushover analysis in SAP2000. Then, the soft-ware is used to finish the pushover analysis of an 8-story frame structure with large-span unbonded prestressed floor and a similar RC frame in an 8-degree seismic fortification intensity zone. With the purpose of evaluating the antiseismic performance of the prestressed structure, it is compared between the above two kinds of structures, including the base shear force-top displacement curves, the performance points, and the occurring sequence of the plastic hinges. The theoretical analysis and the calculating results indicate that when the buildings are regular and not too high, to compare with the similar RC structure, the prestressed frame structure has a better stiffness after cracks, a larger ultimate loading capacity, and a beam-hinge failure mechanism with better antiseismic performance.