楼板及其配筋在RC框架结构实现抗震延性机制中的作用分析

总结采用梁有效翼缘来考虑楼板及配筋对"强柱弱梁"机制形成的影响的实验和数值仿真研究.基于SAP2000采用三种侧向加载模式对RC框架结构不带楼板、不带楼板考虑梁刚度放大、带楼板的三个模型进行pushover分析,对力与位移的关系曲线、塑性铰的出铰顺序以及顶点位移与层间位移等方面进行探讨.结果表明:三个模型的"强柱弱梁"...

Role of Slabs and Reinforcement in Implementation of the Seismic Ductility Mechanism of RC Frame Structures

The implementation premise for seismic ductility mechanism of building structures is that the basic design principles such as "strong column-weak beam" are carried out actually. In previous earthquakes, seismic damage of RC frame structures run counter to the seismic ductility mechanism. In this paper, the experiment and simulation study of the influence of slab and reinforcement on the formation of "strong column-weak beam" mechanism by using effective flange of beam were summarized. Based on SAP2000 software, pushover analysis were carried out on three models of RC frame structures, i.e., structure without floor, structure without floor but considering beam stiffness amplification, and structure with floor by using three lateral loading modes. The relationship curve of force and displacement, the order of plastic hinge, the top displacement, and inter story displacement were analyzed. The results showed that: the phenomenon of "strong column and weak beam" in pure frame structure without floor slab is the most obvious, followed by the model considering the beam stiffness amplification, and that in structure with floor slab is the least obvious. It is proved that the negative moment bearing capacity, stiffness, and other parameters reflecting "strong column and weak beam" and the occurrence order of plastic hinge have obvious corresponding relations with floor slab and in-plate reinforcement. The floor slab and reinforcement, which affect the overall deformation performance and plastic energy dissipation capacity of frame structures, are important influencing factors for the realization of seismic ductility mechanism. In subsequent structural design, it is suggested to consider the actual floor and reinforcement modeling for calculation and analysis.