Analysis of Interaction Between Infill Plate and Frame in Steel Corrugated Shear Walls

With the development of high-rise buildings, horizontal load has become a key factor in structural design. Steel plate shear walls (SPSWs) are widely utilized in practical engineering due to its superior lateral resistant performance. Researchers have carried out indepth research on the mechanical performance. SPSWs have advantages of high ultimate lateral resistance, but their disadvantages still exist:the hysteretic curve appears " pinching" under cyclic load, especially the huge noise produced by thin steel plate, which affect the human comfort of buildings. Corrugated steel plate has advantages of large out-plane stiffness and high ductility due to the existence of corrugation, "in-pate shear yielding" mechanism can be achieved. Compared with ordinary SPSWs, steel corrugated shear walls (SCSWs) still need further investigations. Analysis of lateral resistance of SCSWs under the combined action of lateral load and vertical load is lacking.
The finite element analysis(FEA) was used to analyze the lateral resistant mechanism of SCSWs, and the corresponding threshold flexural rigidity of columns was proposed, influence of vertical load on the performance of infill plates was studied, and design suggestions were given. Firstly, the finite element software ABAQUS was used to simulate the cyclic load test, and the results of test and simulation fitted well, which verified the validity and accuracy of FEA. Through the load-displacement curves of two typical cases, two different lateral resistant mechanisms were revealed. The fact that corrugated plate could resist lateral load through "in-plate shear yielding" or "diagonal tension-field" mechanism was revealed by comparing the bending moment distribution of two typical cases, and the lateral resistant mechanism was determined by the parameter of infill plates only. When SCSWs resist lateral load in "diagonal tension-field" mechanism, low residual resistance may occur due to the "diagonal tension-field" can not be fully developed with the existence of corrugation. Secondly, based on the requirements of the flexural rigidity of columns of unstiffened flat steel shear walls, the influence of the flexural rigidity of boundary columns on the performance of infill corrugated plates was analyzed. It was revealed that with the increase of normalized aspect ratio, the effect of flexural rigidity of boundary columns was more significant. The corrugated infill plate could be considered to resist lateral load with "in-plate shear yielding" mechanism when the normalized aspect ratio λ_n ≤ 0. 45. In this case, the requirements of the flexural rigidity of columns were small, the boundary columns with flexural rigidity EI ≥ 0. 5EI^* were recommended. Infill plates with normalized aspect ratio λ_n ≤ 0. 45 were recommended to ensure sufficient residual resistance. Finally, the influence of vertical load on the performance of infill plate in the range of λ_n ≤ 0. 45 was analyzed. Observing the change of lateral resistance of infill plates when changing the axial pressure on columns, the fact that vertical load had little effect on the maximum resistance was revealed. But the residual resistance would drop due to the shear force of infill plates could not be fully developed when boundary columns had large vertical compression in residual state. With the increase of λ_n, the drop of residual resistance was more significant. This situation could be avoided by increasing the cross-sectional area of boundary columns.