Numerical Simulation Analysis Of Seismic Performance Of L-shaped Short-leg Shear Wall Filled With Double Steel Plates

With the development of high-rise and super high-rise buildings,the double steel plate concrete composite shear wall has been widely used in engineering.In order to improve the seismic performance of short leg shear wall,it is an effective way to adopt the composite short leg shear wall of double steel plate concrete.The concrete of the composite short leg shear wall is at the core position,and the steel plate is located on both sides of the concrete to constrain it.The steel plate and concrete work together through the connection of bolts and so on.The composite short leg shear wall has the advantages of good lateral stiffness,light weight and space saving.The common cross-section forms are one-way,T-shaped and L-shaped.L-section shear wall is often used at the corner of buildings.In view of the lack of research on seismic performance of L-shaped composite short leg shear wall,this paper mainly takes L-shaped composite short leg shear wall as the research object,and carries out the following research work:(1)The finite element model of the in-line double steel plate-concrete short-leg shear wall was established by using the ABAQUS finite element software,and the skeleton curve obtained by the simulation was compared with the results obtained from the literature test.In both cases of monotonic loading and cyclic loading,the simulated peak load and yield load are within 5%of the test results.The simulated hysteresis curve and skeleton curve are basically the same as the test curve,and the failure form is in good agreement with the test results,indicating that the finite element model can simulate the mechanical performance of the component objectively and can be used for subsequent parametric simulation analysis.(2)The mechanical properties of the ordinary reinforced concrete short leg shear wall and the composite short leg shear wall are compared.Under the same section size,the seismic performance of the composite shear wall with two steel plate concrete short legs has been improved obviously.The increase of double steel plate can strengthen the restraint effect on concrete,and improve the bearing capacity,deformation capacity and energy consumption capacity of short leg shear wall.(3)The influence of different parameters and construction measures on the seismic performance of composite short leg shear wall is studied by changing the design parameters and structural measures of L-shaped double steel plate concrete short leg shear wall.The results show that the design parameters such as axial pressure ratio,concrete strength and steel plate thickness have a great influence on the shear wall performance,and the energy consumption capacity and ductility are negatively related to the axial pressure ratio.When the axial pressure ratio is 0.4,the bearing capacity of the component is the largest,and the axial pressure ratio is lower gradually after the axial pressure ratio is greater than 0.4;The load-bearing capacity of the components is positively correlated with the concrete strength,and the energy consumption and ductility are negatively related to the concrete strength;The bearing capacity,energy consumption and deformation capacity of shear wall can be improved by increasing the thickness of steel plate,encrypting bolt,setting up the inner truss and the edge dark column.Especially,the vertical stiffener structure in the built-in truss has a significant influence on the seismic performance of the composite wall.The concrete strength,bolt structure,axial compression ratio and internal truss structure have little influence on the stiffness degradation of composite short leg shear wall,the initial stiffness of the members is positively related to the thickness of steel plate,and the rigid degradation of composite short leg shear wall is obviously affected by the setting of dark column structure at the end.(4)Based on the relevant literature,considering the actual height of the steel plate compression zone and introducing the flange correction coefficient,the calculation formula of the bearing capacity of the normal section and inclined section of L-shaped double steel plate concrete composite short leg shear wall is established.The difference between the calculated bending and shear capacity by the formula is less than 10%,which has a good reference value.