基于弱化连接构造的全现浇混凝土外墙拟静力试验研究

针对填充外墙与剪力墙全现浇结构刚度过大问题,文章研究弱化连接构造对全现浇混凝土外墙抗震性能的影响,并开展了3个缩尺试件的拟静力试验,其中2个分别采用PVC拉缝和挤塑板条弱化连接、1个为纯剪力墙对比试件。研究表明:2种弱化连接构造均不同程度地改变剪力墙结构的破坏形态,其中PVC拉缝弱化连接的延性性能要优于挤塑板条的试件;内含挤塑板的现浇填充墙增加了试件的峰值承载力,其中PVC拉缝和挤塑板条弱化连接试件的峰值荷载是纯剪力墙的2.6、3.6倍;内含挤塑板的现浇填充墙降低了试件的变形性能;内含挤塑板的现浇填充墙增大了试件的初始刚度,其中PVC拉缝试件的初始刚度最大,且刚度退化也最为明显。

In view of the overlarge stiffness of fully cast-in-place concrete infill wall and shear wall, the influence of weakly connected structure on the seismic performance of fully cast-in-place concrete exterior wall is studied. The pseudo-static test on three scaled specimens was conducted, two of which were weakly connected by polyvinyl chloride (PVC) tensile joints and extruded slats, respectively, and one served as a pure shear wall control specimen. The results show that the two kinds of weakly connected structures can change the failure forms of shear wall structures in varying degrees, and the ductility of PVC tensile joint specimen is better than that of extruded slat specimen. The cast-in-place infill wall with extruded slats increases the peak load capacity of the specimen, and the peak load of the PVC tensile joint and extruded slat specimens is 2.6 times and 3.6 times that of pure shear wall specimen. The cast-in-place infill wall with extruded slats reduces the deformation performance of the specimen. The cast-in-place infill wall with extruded slats increases the initial stiffness of the specimen, while that with the PVC tensile joints has the largest initial stiffness and the most obvious stiffness degradation.