Xuhui Ma，Xiaoshuai Song，Zihan Li，Hongyu Sun，Zongmei Xu  Xu Wang，Qiuran Wang，Shaojie Wang

Abstract

To solve the connection problem between cast-in-place boundary elements and precast wall panel for RC superposed shear walls, an open-narrow hoops and connection method were proposed. The effect of strengthened boundary element and structural integrity on the structure seismic behavior and mechanism were investigated through low cycle loading tests under constant axial load and numerical simulation. The research showed that the superposed shear wall with open-narrow hoops representative staged damage mechanism, which were cooperative working stage (Stage 1) and damage energy dissipation stage (Stage 2). With the strengthening of the boundary elements, the drift ratio at the transformation point of the damage mechanism increased from ±0.9 % to ±1.1 %, and degree of damage in vertical damage energy dissipation area during Stage 2 was reduced. As the structural integrity strengthened, the failure mechanism and degree of damage were significantly unchanged. The ultimate lateral load capacity increased by 11.09 % and 2.69 % due to the strengthened boundary elements and structural integrity, respectively, though deformation capacity decreased accordingly. Meanwhile, the study developed the calculation method for the ultimate lateral load of the structure, which showed accurate. In conclusion, the study provided a new connection method and reference for the engineering application of the structure.

Paper Linkage:https://authors.elsevier.com/sd/article/S2352-7102(25)03333-9