Modeling and Simulation of Reinforced Concrete Shear Wall under Bidirectional Earthquake Action

Reinforced concrete shear walls under bidirectional earthquake action were taken as research object, and discretized into irregular polygons in plane, which were stretched into prisms along thickness direction of the wall. Multiple concrete spring points were distributed at side edges of the prism, deformation of concrete spring points were separately considered in axial directions and tangential directions, and they were mutually coupled in stiffness and strength. Reinforced spring points were arranged at intersection points between reinforcements and polygon prisms, and dowel action of reinforcements were neglected. Through a comparison between numerical simulation results and model test results, it could be seen that numerical simulation could accord with model test very well in aspects of failure mode and load-displacement curve. Axial compression ratio and out-of-plane deformation were taken as parameters to expand test data. Research found that when axial compression was not large, increase of axial compression ratio improved bearing capacity of the specimen. If in-plane force was conducted after a certain displacement out-of-plane was applied, the greater the out-of-plane displacement above the shear wall was, the more the in-plane bearing capacity reduced, and the more in-plane deformability degraded. (paper)