RPC面层加固约束空斗墙参数分析和抗震承载力研究

为弥补空斗墙抗震性能差和发挥活性粉末混凝土(RPC)的超高韧性,对1片未加固处理的空斗墙和2片由RPC面层加固处理的空斗墙分别进行拟静力试验,并结合有限元对三组试验进行参数分析。得出影响墙体抗震性能的主要因素有:墙体构造柱尺寸、轴压比、RPC单双面加固以及面层加固厚度。根据试验和有限元所得到的破坏特征,结合圈梁-构造柱对墙体的约束作用,引入等效受压斜撑模型,并量化圈梁-构造柱对墙体约束效应。基于圈梁-构造柱与墙体、RPC面层与被约束的墙体的协同受力特性,建立约束墙体及面层加固体墙的抗剪承载力的计算式。

Parameter analysis and seismic bearing capacity study of RPC surface reinforcement constraint hollow bucket wall

In order to make up for the poor seismic performance of the cavity wall and give play to the ultra-high toughness of reactive powder concrete(RPC), the pseudo-static test was conducted on one piece of cavity wall that was not strengthened and two pieces of cavity wall that was strengthened by RPC surface layer, and the parameter analysis of three groups of tests was conducted by undertaking the finite element method. It is concluded that the main factors affecting the seismic performance of the wall are: the size of constructional column, the axial compression ratio, the reinforcement of RPC single, double sides and the thickness of the surface layer. According to the failure characteristics obtained by tests and finite element analysis, combined with the restraint effect of ring beam-constructional column on the wall, the equivalent compression diagonal brace model is introduced, and the restraint effect of ring beam-constructional column on the wall is quantified. Based on the synergistic force characteristics of ring beam-constructional column and wall, RPC surface layer and constrained wall, the shear bearing capacity of restrained wall and solid wall was calculated.