简化构造约束型再生砖墙体抗震性能分析

Research on seismic performance of simplified constructional restrained RAC brick masonry walls

提出了一种简化构造约束型再生砖砌体结构,采用在再生砖墙体端部和中部布置竖向构造钢筋的构造措施。为深入研究这种简化构造约束型再生砖墙体的抗震性能,用ABAQUS对已完成的2个不同构造措施再生砖墙体试件低周反复荷载下的抗震性能试验进行数值模拟,其中,1个为普通再生砖墙体,1个为简化构造约束型再生砖墙体,2个墙体试件高宽比均为0.6。分析了各试件弹塑性变形特点,得到了水平荷载-水平位移关系曲线,计算结果与实测骨架曲线符合较好。同时分析了简化构造约束墙体水平承载力随墙体压应力比变化的规律。研究表明:简化构造约束型再生砖墙体抗震性能良好,所采用简化构造措施施工相对容易,造价较低,适合于村镇低层房屋抗震设计。

In this paper,a simplified constructional restrained recycled aggregates concrete( RAC) brick masonry structure,in which vertical constructional reinforcements were set in the middle and at the ends of the wall,was proposed. In order to investigate the seismic performance of the wall,two RAC brick walls with or without vertical constructional reinforcements were simulated by ABAQUS software. The aspect ratio of the two walls is 0. 6. The elastoplaslic deformation characteristics were analyzed and the relation curves of horizontal load to horizontal displacement were obtained. The calculated results agree well with the experimental results. Meanwhile,the change laws of its horizontal bearing capacity to pressure stress were analyzed as well. Study shows that,the RAC brick masonry wall with simplified constructional restraint exhibits good seismic performance,and it is easy to construct and with low cost. Thus,it is suitable for the seismic design of rural low-rise buildings.