错列开洞钢筋混凝土剪力墙抗震性能数值模拟

为探究错列开洞剪力墙的抗震性能,通过有限元软件ABAQUS对错列开洞剪力墙抗震试验进行数值模拟,通过试验结果验证所建立精细化有限元模型的准确性。基于已验证的有限元模型开展参数分析,研究剪跨比、轴压比、开洞率以及有无附加纵筋等参数对错列开洞剪力墙抗震性能的影响。结果表明:不考虑轴压比时,剪跨比较大的剪力墙主要破坏于底部翼缘及墙体; 随着剪跨比的提高,剪力墙的峰值荷载减小,延性提高; 随着轴压比的提高,剪力墙的延性降低,峰值荷载先增加后减小,且峰值荷载的拐点在轴压比为0.2～0.5之间; 剪力墙的峰值荷载和延性随开洞率的提高而降低; 考虑附加纵筋时,若错列开洞剪力墙的开洞率较小且满足规范基本要求时,可以按照无洞口剪力墙计算其承载力; 考虑了附加纵筋影响的错列开洞剪力墙具有较好的承载力和延性,无附加纵筋的错列开洞剪力墙应力集中现象较严重; 开洞率较小时,剪力墙底部是薄弱区域,以剪切破坏为主; 开洞率较大时,剪力墙受到不协调的变形作用而发生破坏。

Numerical Simulation on Seismic Performance of Reinforced Concrete Shear Wall with Irregular Openings

In order to study the seismic performance of shear wall with irregular openings, the seismic test of shear wall with irregular openings was numerical simulated by ABAQUS software, and the finite element model was verified through test results. Based on the validated finite element model, the parameter analysis was carried out to study the influences of shear span ratio, axial compression ratio, opening rate and additional longitudinal reinforcement on the seismic performance of shear walls with irregular openings. The results show that when the axial compression ratio is not considered, the shear wall with large shear span ratio is mainly destroyed in the bottom of flange and wall. The increase of shear span ratio will decrease the peak load and increase ductility of shear wall. With the increase of axial compression ratio, the ductility will be poorer, and the peak load of the shear wall firstly increases and then decreases, and the turning point of the peak load is between 0.2 and 0.5 of axial compression ratio. The peak load and ductility of the shear wall will decrease with the increase of the opening rate. When considering the additional longitudinal reinforcement, the bearing capacity of the shear wall with irregular openings can be estimated as the shear wall without openings if the opening rate is small and meets the basic requirement of the code. The shear wall with irregular openings considering the influence of additional longitudinal reinforcement has better bearing capacity and ductility. The stress concentration is more serious for shear wall with irregular openings without additional longitudinal reinforcement. The weak area appears at the bottom of the shear wall and mainly destroys with shear failure when the opening rate is small. The shear wall is damaged by uncoordinated deformation if the opening rate is large.