Abstract: A new modular composite shear wall with double steel plates and infill concrete is proposed for increasing lateral resistance of steel frame. The shear wall module is connected to the upper and lower beams by bolting. The wall modules are prefabricated in the factory, and the whole wall is fully bolted on the construction site. Therefore, the new type of composite shear wall is convenient and quick to construct, convenient for assembly and disassembly, and it can be removed at the end of the building life, and it is green and environmentally friendly. In thi paper, the lateral performance of the modular composite shear wall with double steel plates and infill concrete was analyzed numerically.
First, the experimental results on concrete filled steel box shear wall were referred to establish the ABAQUS finite element model for predictions, which shows the reliability of the established ABAQUS model. Then the 23 finite element models of the modular composite shear wall with double steel plates and infill concrete were established, and the number of wall modules, concrete compressive strength, steel yield strength, axial compression ratio and steel plate thickness were investigated to discuss the influence on the lateral resistance, the lateral stiffness and the ductility.
The wall can be divided into 1 to 4 modules. With the increase in the number of divided wall modules, the yield load and peak load of the wall decrease, and the overall capacity of the wall gradually decreases; the ultimate displacement of the wall gradually increases, the ductility coefficient became larger and the deformation capacity increased. For concrete compressive strength is taken as from 30 MPa to 80 MPa. As the strength of concrete increased, the lateral stiffness of the wall increased slightly, and the ultimate displacement basically showed a decreasing trend. The ductility coefficient of the wall gradually decreased. The deformability of the wall gradually decreased, but the reduction was not large. For the yield strength of steel plates is compared from 235 MPa to 500 MPa. As the yield strength of the steel plate increased, the yield load and peak load of the wall gradually increased, and the resistance increased; the yield displacement and ultimate displacement of the wall gradually increased, the ductility coefficient of the wall gradually increased, and the deformation capacity increased. For the axial compression ratio, the variation range was from 0. 1 to 0. 6, with an increase of 0. 1 for each level. When the axial compression was relatively small, increasing the axial compression ratio can increase the yield load and peak load of the composite shear wall. The steel plate thickness is analyzed from 2 mm to 6 mm. With the increase of the thickness of the steel plate, the yield load and peak load of the wall gradually increased, the resistance increased, the initial lateral stiffness of the wall gradually increased, the ductility coefficient gradually increased, and the deformation capacity increased.
From the analysis, it can be found that increasing concrete strength, steel plate yield strength, and steel plate thickness can improve wall resistance, and increasing steel plate yield strength and steel plate thickness will increase its ductility. The lateral stiffness of the modular composite shear wall with double steel plates and infill concrete under horizontal load is contributed by the concrete part and the steel plate. Increasing the thickness of the steel plate can improve its lateral stiffness. The more the number of the wall is divided into modules, the lower the initial stiffness and the lower the overall resistance. It is suggested that the number of divided modules should not exceed 3 under the conditions of meeting the construction environment.