Research on Mechanical Properties of Double-Faced Precast Concrete Superposed Shear Wall with Structural Steel Trusses Under Axial Compression

By conducting axial compression tests and finite element analysis on three double-faced precast concrete superposed shear wall(DPCW)specimens, the damage patterns, deformation and ultimate bearing capacity of double-faced precast concrete superposed shear walls under axial load were studied, and the effects of different connection methods between steel truss and distributed reinforcement mesh on the mechanical properties of double-faced precast concrete superposed shear wall specimens were analyzed. The test results showed that the damage of double-faced precast concrete superposed shear walls under axial load started from the cracking of the concrete laminated surface of the precast and post-cast layers, and when the ultimate load was reached, the cracks of laminated surface on both sides of wall slabs were penetrated, and concrete of wall slabs was crushed. In this test, the ultimate bearing capacity of the specimen of double-faced precast concrete superposed shear wall with tied connection of reinforcement joist and distribution bar mesh was higher than that of the specimen with welded connection. The finite element calculation results of double-faced precast concrete superposed shear wall specimens were in good agreement with the test results; the parameter analysis results showed that increasing the friction coefficient of precast-postcast concrete laminated surface and the diameter of web reinforcement of steel truss could significantly improve the ultimate bearing capacity of laminated wall slabs.