Experimental study on seismic performance of new-type fabricated shear wall with mortar connection

Abstract

This paper proposes a new type of fabricated shear wall system, that is, the two ends of the horizontally distributed ribs and the top of the vertical distributed ribs are reliably connected with the cast-in-situ belt, and the bottom of the vertical distributed ribs is not penetrated and only connected by mortar. To study the seismic performance of the new wall, 7 specimens of the shear wall were designed and manufactured, including 2 cast-in-place shear walls and 5 new fabricated shear walls. Through low-cycle reciprocating loading tests, different analyses were made. Shear span ratio and different edge restraint structure of the new fabricated shear wall failure mode, bearing capacity and other seismic performance, and through OpenSees finite element analysis of the wall to verify the correctness of the modelling method. The test results show that the failure characteristics of the new wall are mainly the cracking and penetration of the mortar layer, the crushing of the corner concrete and the local buckling of the steel bars at the bottom of the edge members; compared with the cast-in-place wall, the new wall has the lower bearing capacity, but the deformation and energy consumption are not much different. The reinforced edge members can effectively compensate for the weakening of the integrity of the wall panel caused by the discontinuity of vertical steel bars. Among the 7 specimens, the overall performance of the wall with increased longitudinal reinforcement ratio is the best. The error between the wall finite element results and the test results is less than 5%, which shows that the modelling method in this paper has sufficient accuracy for the evaluation of the seismic performance of the new wall. In general, the new prefabricated shear wall system is feasible in high-rise buildings. • A new type of fabricated shear wall system is proposed. • The bottom of the vertical distribution bar of the wall panel is disconnected, and only connected by setting mortar. • This system is simple to construct, fast, low cost, clear force transmission path, clear seismic performance, and more importantly, easy to detect.