Research Of Construction Monitoring　and Simulation For Steel Plate Sheer-wall Structure And Long-Span Spatial Structure Considering Time-Varying

This paper considers the mechanical characteristics of low rise and multi-story building shear wall structures based on analyses of related domestic and foreign research achievements. Eight full-scale specimens of reinforced concrete shear walls were tested and studied under static-cyclic loading. The wall specimens'width, height and thickness dimensions were 2000mm,1600mm and 130mm respectively. The horizontal and vertical distribution reinforcement of the wall was arranged in separate single layers. The distribution reinforcement ratio was controlled at 0.1%-0.2% by changing the reinforcement spacing. The ratio of axial force to the product of the concrete section area and compressive strength of the wall was equal to 0.08. Using the single reinforcement layers and different distributions of the reinforcement spacing (through the variation of the reinforcement ratio) the study focuses on the influence the variations had on the bearing capacity, energy dissipation capacity, ductility, stiffness and failure modes of the wall specimens. In addition, nonlinear numerical analyses of the tested specimens were made via the large finite element program ABAQUS and ANSYS respectively. The analytical results match the experimental ones well.Based on the experimental and analytical results the main conclusions that are reached in this paper are as follows:(1) The failure mode of the specimen belongs to bending. The concrete was crushed before the diagonal cracks occurred. For the wall specimens of reinforcement ratio more than 0.1%, three main cracks formed below 600 mm from the bottom of the wall with a diagonal angle of about 35°to the horizontal; and for the wall specimens of reinforcement ratio equal to 0.1%, only one diagonal crack formed 200 mm from the bottom of the wall.(2) The flexural strength and shear capacity of the wall specimens calculated by the formulas of the Chinese code, the Technical Specification for Concrete Structures of Tall Buildings, was lower than the tested practical capacity and the Specification can predict the failure mode correctly. Accordingly, it is safe to design using the current codes for shear walls with single layered reinforcement, low axial compressive force ratios, low shear-span ratios and low reinforcement ratios.(3) With the distribution reinforcement ratio of the wall decreasing from 0.2% to 0.1%, the yield load falls nearly by 9%, the ultimate load falls by about 13%, but the stiffness and ductility do not change significantly. With the low axial compressive force ratio, the stiffness and the ductility of the walls are controlled by the strength of the concrete, the section size and the longitudinal reinforcement and stirrups of the edge element. The contribution of the distribution reinforcement to the bearing capacity is not obvious.(4) Nonlinear analysis was done using ABAQUS with the separated modeling and plastic damage constitutive model. The stress-strain curve was calculated by means of Appendix C of the Chinese National Code for Design of Concrete Structures and the damage parameter index value was obtained by Mazars model. The analytic results show that ABAQUS simulates well the load-displacement curve of the specimens before the yield displacement. The calculated ultimate load is lower than the experimental result and the change of the distribution reinforcement ratio of the specimens has nearly no influence.(5) Nonlinear analysis was also done using ANSYS with the integral modeling of concrete. The real constant was defined by taking only the meshing of the plane vertical to the X axis of the coordinate system. The analytic results show that ANSYS can simulate well the load-displacement curve before the cracking displacement. The calculated ultimate load is also lower than the experimental one.According to the results of the study shear wall design with bi-directional single layered reinforcement and low reinforcement ratio applied to low rise and multistory buildings has appropriate load bearing capacity, stiffness and ductility. This type of shear wall can, to an appreciable extent, save material and has a reasonable application prospect.