后置翼墙加固框架柱抗震变形能力研究

Study on seismic deformation ability of reinforced concrete frame column with post-built wing walls

为考察后置翼墙加固混凝土框架柱的抗震性能,结合已有研究中试验轴压比为0. 31、0. 36、0. 40,原柱纵筋配筋率为0. 82%~1. 23%的18个后置翼墙加固试件的低周反复荷载试验,采用ABAQUS软件进行了675个后置翼墙加固试件在水平反复荷载下的有限元模拟。试验和有限元分析结果表明:由于后置翼墙作为原柱的耗能及加固部件有效保护了原柱,后置翼墙加固试件中原柱损伤相对较轻;后置翼墙一字形加固柱的损伤主要发生在两片后置翼墙端部区域,T形及L形加固柱原柱损伤主要发生在未后置翼墙一侧,且损伤区域较小;建立了翼墙加固柱极限层间位移角关于原柱轴压比、剪跨比、翼墙钢筋配筋率等关键参数的计算式。

In order to investigate the seismic performance of reinforced concrete frame columns with post-built wing walls,low-cycle reversed loading tests toward 18 reinforced concrete specimens with post-built wing walls and finite element analysis of 675 models were completed. In the 18 reinforced concrete specimens with post-built wing walls,the test axial compression ratios of existing columns were 0. 31,0. 36 and 0. 40,respectively,while the longitudinal reinforcement ratios of existing columns ranged from 0. 82% to 1. 23%. The test and analysis results show that the wing walls are used as a energy dissipating element and reinforcing component to protect the existing column,so that the damage of existing columns with post-built wing wall are relatively damaged lightly. The damage of the 1-shaped reinforced column of the wing wall mainly occurs in the end region of the two rear wing walls. The damage of the original column of the T-shaped and L-shaped reinforced columns mainly occurs on the side of the rear wing wall and the damage area is small. The mathematical expression of the ultimate displacement angle of the wing-wall reinforced column by giving consideration to the key parameters of the existing column such as axial-compression ratio,shear span ratio,reinforcement ratio of the wing walls,etc.