Experimental Investigation On Perforated Butterfly-shaped Steel Plate Shear Wall With Welded Channel Steel Stiffening On Both Sides

As a new type of structure formed by the continuous development of slotted shear wall systems,perforated butterfly-shaped steel plate shear walls can effectively control the forming position of plastic hinge on the section of butterfly-shaped bar by changing the shape of it,so as to enhance the anti fatigue ability of steel plate walls;the arrangement of butterfly-shaped bar also makes the stress distribution of steel plates more reasonable,and improves the energy consumption ability of steel plates.In this paper,a new type of perforated butterfly-shaped steel plate shear wall is studied to solve the problems of serious global instability and local stress concentration leading to steel plate tearing,in which the upper and lower ends are connected with frame beams,the two sides are not connected with frame columns,but the two sides are strengthened by welded channel steel.The main work of this paper is as follows:1)Four full-scale specimens were tested under cyclic loading.On the premise that the waist width ratio of butterfly bar is controlled at 0.4,the influence of steel plate thickness and opening ratio on hysteretic performance,bearing capacity and energy dissipation performance of perforated butterfly steel plate shear walls are studied.The test results show that the perforated butterfly-shaped steel plate shear wall has good seismic performance and is an ideal anti lateral force component and energy dissipation component;the ultimate failure mode of the perforated butterfly-shaped steel plate shear wall is the cracks at the end of the outermost butterfly bar of the steel plate;with the increase of the thickness of the steel plate wall and the decrease of the opening ratio of the steel plate wall,the lateral stiffness and bearing capacity of the test piece increase and the energy consumption increases.2)The general finite element analysis software ABAQUS 6.14-4 is used to analyze the nonlinear finite element of the butterfly-shaped steel plate shear wall,and the simulation results are compared with the corresponding test results to analyze its deformation,hysteretic curve and skeleton curve.The results show that the numerical simulation can accurately track the stress state of the perforated butterfly-shaped steel plate shear wall.In the early stage of loading,the butterfly bar first enters the plastic section at L/ 6 from the end of the bar,and as the loading continues,the plastic area begins to expand to the waist and both ends;In the early stage of loading,the bending deformation in the plane is the main deformation of butterfly bar,but in the later stage of loading,the bending deformation out of the plane is caused by plastic accumulation.The results of numerical simulation show that the hysteretic curve and the skeleton curve are slightly larger than the test results,but the overall trend of the hysteretic shape and skeleton curve is basically the same.Therefore,ABAQUS can be used for numerical analysis of this kind of steel plate shear wall.3)The finite element parameters simulation analysis is carried out,focusing on the influence of the row number m of the butterfly bar,the height L of the butterfly rod and opening ratio on the seismic performance of steel plate.The results show that the skeleton curves of the specimens show the characteristics of "double fold line",that is,the stress of the specimen in the loading process can be simplified into two stages: elastic stage and elastic-plastic stage.In the elastic-plastic stage,the energy consumption of the specimen is small,while in the elastic-plastic stage,the butterfly plate begins to yield energy consumption,and the energy consumption of the specimen begins to increase;with the decrease of the height L of the butterfly rod and the row number m of the butterfly rod(that is the reduction of opening ratio),The bearing capacity and energy consumption of steel plate wall increase;When the opening ratio is fixed,the change of the row number m of the butterfly bar is more important than the change of the height L of the butterfly bar.It is suggested that the height L of the butterfly rod of this kind of shear wall should be within300 mm to 400 mm,and the row number m should be within 3.Besides,the opening rate of such steel plate wall should be within 16%.