THE COMPRESSION-BENDING CAPACITY CALCULATION OF MONOLITHIC PRECAST GRID SHEAR WALL

The cyclic loading test of 6 specimens of monolithic precast grid shear wall was conducted, and the influence of vertical reinforcement splicing in a precast panel, of vertical joints connection form, and of reinforcement pattern of a precast panel on seismic performance and bending capacity of walls was studied. The test shows that 6 specimens suffered from bending failure mainly due to the failure of vertical edge frame. The bearing capacity could be effectively improved, when the vertical reinforcement of a precast panel was welded with embedded parts. The vertical joints connection form had little effect on the bearing capacity of specimens. The bearing capacity and ductility of well-shaped reinforced wall were slightly larger than those of other types of reinforced wall. Based on the assumption of plane section, a calculation method for moment-curvature in cracking, yielding, peak, and ultimate state of walls was established, taking fully into account the role of reliable connecting steel bars in a precast panel and ignoring the role of unrelated steel bars, and the main factors influencing the calculation formula of bearing capacity of walls at different states were discussed. It is shown that the proposed moment-curvature calculation method can be used to predict the load-deformation relationship of monolithic precast grid shear walls accurately. The calculated values were in a good agreement with the experimental results.