EXPERIMENTAL STUDY ON SEISMIC BEHAVIOR OF ASSEMBLED SERRATE-EDGES MONOLITHIC SHEAR WALL WITH CAST-IN-PLACE BOUNDARY ELEMENTS

In order to study the seismic performance and the mechanical behavior of vertical joint of assembled serrate-edges monolithic shear wall, one cast-in-place concrete shear wall and three new type shear walls were conducted by quasi-static tests，whose variable parameters include axial compression ratio and shear span ratio. The results show that: all specimens are flexural failure modes, and the flexural capacity and stiffness of the serrate-edges monolithic shear wall are equivalent to these of cast-in-place concrete shear wall. It can be proved that serrate-edges monolithic shear wall has good seismic performance, which can satisfy the design concept of ‘being equivalent to cast-in-place counterparts’. The vertical joints keep intact when the displacement angle is 1/1000, and the sliding deformation of the vertical joints occurred when the displacement angle is greater than 1/500. The hysteretic curve of assembled serrate-edges monolithic shear wall is full, and the displacement ductility coefficient is greater than 5, which can be proved that the new type shear wall has good deformation performance. Increasing the axial compression ratio and reducing the shear span ratio expedite crack propagation of vertical joints and the development trends of relative deformation between each side of the vertical joints. Changing these parameters, the influence law of flexural and deformation capacity of the serrate-edges monolithic shear wall is the same as that of cast-in-place shear wall. Under high axial compression, the failure region is concentrated in the vicinity of dowel hole, forming vertical cracks, and the collapse area is reduced at the toe of the shear wall. The numerical analysis was carried out by ABAQUS. The skeleton curve and failure morphology are in accordance with the test results. The effect of axial compression ratio and shear span ratio on the wall performance is consistent with the test. Increasing the size of the transverse slot and reducing the inner size of the transverse groove have little effect on the mechanical properties of the walls. © 2023 Tsinghua University. All rights reserved.