Seismic performance of a new type precast concrete sandwich wall based on experimental and numerical investigation

Abstract

Quasi-static tests and simulation were carried out on a new type cast-in-situ concrete sandwich wall and two new type precast concrete sandwich walls. The seismic performances of the specimens were experimentally and numerically evaluated including failure mode, loading and deformation capacity, ductility, strain, stiffness, and energy dissipation. The numerical simulation of the specimen is carried out with Msc. marc software, whose results are consistent with the experimental results. The seismic performance of the wall proposed in this paper is better than that of squat shear wall. The brittle failure mode of squat shear wall is optimized to ductile failure mode. The seismic performance of precast sandwich wall with the steel connection with aluminum friction plate (CAF) at vertical seam is better than that of cast-in-situ sandwich wall. The cyclic performance of precast sandwich wall with special round steels (SRS) connecting horizontal seam and cast-in-situ sandwich wall are almost the same. SRS can be used to transfer the internal force and dissipate energy effectively. The bolt and welded H-section steel (WHS) combined to connect horizontal and vertical seams can be regarded as rigid connections. In addition, several precast sandwich wall structure models were established and analyzed based on the sandwich walls. It can be concluded that the use of CAFs and SRS can effectively reduce the stiffness and loading capacity, improve the deformation capacity, reduce structural damage and maintain the energy dissipation of the structure. The use of prestressed strands can greatly improve the resilience ability of the structure, and the larger the prestressing force, the stronger the self-centering capacity.