Numerical Simulation On Hysteretic Behavior Of Rectangular Cross Section Reinforced Block Masonry Shear Wall

Reinforced block masonry shear wall structure is one kind of new high-rise structure that combines performance and advantages both the masonry structure and the concrete structure, and its economy and applicability are adapt to the residential building needs and the reform direction of wall. However, the characteristics can't be well summed up because of large material discrete and limited experimentation.To study the internal force and deformation of shear wall on high-rise buildings and earthquake response analysis of high-rise buildings with shear wall, previous proposed many calculation programs, such as equivalent beam model, wall model, equivalent support model, three-vertical poles and multi-vertical bars model, two-dimensional plate element model. Each of them with advantages and disadvantages solves partial problems from different aspects considering shear deformation which is necessary to shear wall solution. Considering the material nonlinearity in a complex stress state, it's no doubt that the fiber element model is chose. However, the traditional fiber element and its various improvements had not abandoned the basic assumption of "flat section". For a shear wall with a small aspect ratio, it's clearly not in the plane after deformation. From the basic idea of finite element method, the key is to construct a displacement field approximating to the real deformation. Based on the idea, the paper explores and gives the deformation laws of all points in different homogeneous shear walls with different geometry by analyzing finite element models of homogeneous shear walls simulating the real force. From the deformation law closing to the actual, on the basis of the assumptions that the deformation of elastic and plastic is the same (the same as the column unit), the material nonlinear analysis using fiber model under complex stress state should have universal (applicable to shear wall analysis of all kinds of materials)and higher accuracy.Based on the the deformation law by shear of homogeneous walls according to numerical analysis, the paper abandoned traditional plane section assumption, and construct a fiber element model considering the cross-section warping effects. In order to verify the applicability and reliability of the new fiber in nonlinear analysis of shear wall, the reinforced block masonry shear walls with existing experiments results are numerical simulated. The result demonstrate that the fiber element model considering the cross-section warping effects can reproduce the objective laws of physics experiments. Especially the yield load and yield displacement have been greatly improved relative to conventional fiber unit. On this basis, considering the possible project range of shear wall aspect ratio and the possible masonry compressive strength, axial compression ratio, reinforcement ratio, reinforced block masonry shear walls in a straight were arranged for numerical tests with a uniform design. Nonlinear numerical analysis was carried out under the same loading mechanism to construct the empirical formula between the walls skeleton curves parameters and considered factors, and then give the loading and unloading hysteresis rules of the wall. It's the basis of elastoplastic analysis of high-level with reinforced block masonry shear wall as it's lateral force structure.