Nonlinear Finite Element Analysis Of Inner Steel Plate High-strength Concrete Composite Shear Walls

Considering high-rise buildings in highly seismic region,the design of shear wall structure is mainly controlled by seismic action.If only by using common concrete shear wall structure,it will enable shear wall limb at the bottom of buildings more or thicker and will reduce the practicability of buildings.If steel plate concrete composite shear wall structure is adopted which has good ductility and energy dissipation capacity,the structure design will become too conservative and the economic benefit will be low.Based on the study of common concrete shear wall structure and steel plate concrete composite shear wall structure,the author puts forward to study inner steel plate-high-strength concrete composite shear walls which have better ductility,energy dissipation capacity and larger lateral anti lateral bearing capacity.It not only reduces the thickness of shear wall limb to make the structure more reasonable,but also reduces the cost,so that the structure has better economic performance.In this paper,the main contents as follows:(1)Collect and sort out the experimental data of steel plate high-strength concrete composite shear walls.(2)The 10 specimens of inner steel plate high-strength concrete composite shear walls are simulated and verified by ABAQUS.(3)The constitutive model of concrete under uniaxial compression and the bond-slip between steel and concrete through SPRING2 are taken into consideration to study the seismic performance of specimens by ABAQUS.(4)The difference and connection between failure modes and acceptance mechanism of medium-high and low shear walls with or without steel plate are analyzed and compared.(5)Steel ratio,steel plate position,axial compression ratio,shear span ratio are studied for the influence of load displacement curve,skeleton curve,failure mode,interstory drift and ductility coefficient in steel plate high-strength concrete composite shear walls.(6)The influence of steel ratio is preliminarily investigated on the seismic performance of steel plate high-strength concrete composite shear walls.Through analysis the following conclusions can be drawn:(1)ABAQUS can be used to carry out nonlinear analysis of steel plate-high-strength concrete composite shear walls.The simulation results are in good agreement with the experimental results.It can be used for nonlinear finite element analysis of plate high-strength concrete composite shear walls.(2)Saenz expression and normalized expression are used as constitutive model of concrete under uniaxial compression,so that the simulation results are basically consistent.The bond slip between the steel and concrete can not be considered.(3)The shear span ratio has a great influence on the failure mode of steel plate shear wall,shear failure occurs in low shear walls;flexural-shear failure occurs in medium-high shear walls;flexural failure occurs in high shear walls.The smaller the shear span ratio is,the greater stiffness of the specimen is,the larger peak bearing capacity is,the steeper the load displacement curve decreases.(4)Steel ratio has an influence on the seismic performance of inner steel plate high-strength concrete composite shear walls under the same high axial compression ratio.