组合式钢框架内填预制RC墙结构静力性能有限元分析

Finite element analysis of the static behavior of steel frames with combined precast reinforced concrete infill wall structures

钢框架内填预制钢筋混凝土剪力墙结构是新型混合式结构,由钢框架与内填墙组成双重防线,具有良好的抗侧力能力,同时预制构配件和预制装配建筑有利于推动住宅产业化发展.考虑大尺寸内填预制RC墙运输和安装困难的情况,提出竖向和横向组合式钢框架内填RC墙结构,采用ABAQUS建立有限元模型进行结构受力分析.通过分析荷载位移曲线,构件应力分布和变形情况,研究结构破坏特点和受力性能.结果表明,全螺栓结构因其合理的传力路径,有良好的承载力和延性;竖向组合式具有较好的初始刚度和整体承载力,与全螺栓连接预制RC墙有近似的受力性能,便于运输和安装;而横向组合式由于上下板缺乏有效传力路径,初始刚度和最终承载力都明显低于全螺栓和竖向组合式,不利于实际工程应用.

Steel frames with precast reinforced concrete infill walls are a new type of composite structures. These composite structures have excellent lateral resistance behavior because of double defense lines comprising the steel frame and infill walls. At the same time,precast members and prefabricated buildings are favorable for the development of the housing industry. Considering the difficulties in the transportation and installation of large precast RC infill walls,steel frames with vertical and horizontal combined precast RC infill wall structures were proposed,and finite element models were established by using ABAQUS to analyze the mechanical behaviors of the structures. By analyzing load-displacement curves,stress distributions,and deformations of members,the damage characteristics,and mechanical behaviors of the structure were studied. The results show that the whole bolt structure has good bearing capacity and ductility owing to its reasonable load transfer path; the vertical combined model has excellent initial stiffness and ultimate bearing capacity,similar to the whole bolt connection precast RC wall. Furthermore,the vertical combined precast RC infill wall is convenient for transportation and installation. However,the initial stiffness and ultimate bearing capacity of the horizontal combined model are both less than the corresponding values for the whole bolt model and the vertical combined model because of the lack of an effective load transfer path between the top and bottom RC walls. Hence,this horizontal model is not favorable forpractical engineering applications.