带PC填充墙的装配式RC联肢剪力墙受力性能数值分析

Numerical analysis on mechanical performance of precast RC coupled shear wall with PC infill wall

为研究带预制混凝土(PC)填充墙的装配式RC联肢剪力墙在水平荷载作用下的受力性能,基于试验建立了无填充墙试件(CSW-N)和带PC填充墙试件(CSW-F和CSW-R)的有限元模型,并考察了轴压比、PC填充墙混凝土强度等级和刚性连接试件锚固钢筋布置等对装配式RC联肢剪力墙受力性能的影响。结果表明:轴压比由0.1增加至0.6时,试件CSW-F峰值承载力增加了约69.92%,延性系数下降了约40.68%;试件CSW-R的峰值承载力增加了约47.00%,延性系数下降了约42.06%。对于试件CSW-F,由于PC填充墙对剪力墙的约束作用较小,随PC填充墙混凝土强度等级增大,其峰值承载力增幅较小;对于试件CSW-R,当实心墙和夹心墙混凝土强度等级由C15增加至C30时,试件的峰值承载力分别提高了7.20%和4.32%,在相同混凝土强度下,实心墙的承载力高于夹心墙的承载力。对于试件CSW-R,锚固钢筋直径变化对剪力墙受力性能影响较小,但增加锚固钢筋数量可提高剪力墙峰值承载力。

In order to study the mechanical performance of precast RC coupled shear wall with precast concrete(PC)infill wall subjected to horizontal load,the finite element analysis(FEA)models for one specimen without infill wall(CSW-N)and two specimens with PC infill walls(CSW-F and CSW-R)were established.The influence of axial compression ratio,concrete strength grade of PC infill walls,and arrangement of rigidly connected specimens’anchorage reinforcement on the mechanical performance of precast RC coupled shear walls was examined.The research results show that when the axial compression ratio is increased from 01 to 06,the peak load capacity of the specimen CSW-F increased by about 6992%,the ductility coefficient decreased by about 4068%,and the peak load capacity of the specimen CSW-R increased about 4700%,and the ductility coefficient decreased by about 4206%.For specimen CSW-F,the increasing concrete strength of the PC infill walls had little influence on the peak load capacity of specimen due to the small constraint effect of the PC infill wall on the shear wall.For specimen CSW-R,the peak load capacity increased by about 720%and 432%when the concrete strength grade of the solid walls and sandwich walls increased from C15 to C30,respectively.The peak load capacity of the specimen with solid walls is higher than that of sandwich walls under the same concrete strength.For specimen CSW-R,the variation in diameter of anchorage reinforcement has a minor effect on the structural performance of shear walls,but increasing the number of anchorage reinforcements can enhance the peak load capacity of the shear walls.