Seismic Performance Study Of Thick Steel Plate Reinforced Concrete Shear Walls

The thick double-steel plate concrete composite shear wall is currently used in the nuclear power plant shield building’s nuclear safety shell structure,which is an important component of the shield building.Therefore,in-depth research on the seismic performance of the thick double-steel plate concrete shear walls is of great significance for improving the safety of equipment inside the nuclear safety shell.Unlike the steel plate concrete shear wall structures commonly used in high-rise buildings,the thickness of the concrete in the double-steel plate concrete shear wall is usually around 1 meter,and the ratio of steel plate thickness to concrete thickness is 3-5 times that of a normal steel plate concrete composite shear wall.Therefore,its structural behavior is more complex.Currently,there have been many studies on the seismic performance of steel plate concrete composite shear walls used in high-rise buildings.However,due to the special nature of the thick double-steel plate concrete composite shear walls used in nuclear engineering,there have been relatively few studies on this type of wall.This article focuses on the thick double-steel plate concrete shear walls used in nuclear safety shell structures and uses finite element simulation analysis methods to study the effects of steel plate thickness,steel fiber content,and axial compression ratio on the seismic performance of these walls.The main contents and achievements of this article are as follows:(1)Using finite element analysis software,a finite element model of the thick double-steel plate concrete shear wall used in nuclear engineering was established,and the experimental results from literature were compared and validated.The model can provide support for the study of the seismic performance of the shear wall.(2)By changing the steel plate thickness in the thick double-steel plate concrete shear wall,the effect of steel plate thickness on the seismic performance of the specimen was studied.The results show that as the steel plate thickness increases from 0 to 6mm,the peak load of the specimen increases from 629 KN to 1576 KN,and the specimen’s load decreases slowly after reaching its peak,indicating that increasing the steel plate thickness is beneficial to increasing the specimen’s resistance to deformation.As the steel plate thickness increases,the ductility of the specimen increases from 2.6 to 3.2.Therefore,increasing the steel plate thickness greatly improves the seismic performance of the specimen.(3)By changing the steel fiber content in the thick double-steel plate concrete shear wall,the effect of steel fiber content on the seismic performance of the specimen was studied.The results show that as the steel fiber content increases from 1% to 4%,the peak load of the specimen increases from 833 k N to 1058 k N.When the steel fiber content is less than 2%,the ductility of the specimen increases from 2.7 to 3.0.When the steel fiber content is greater than2%,the ductility of the specimen decreases from 3.0 to 2.1.Based on this study,it is recommended to apply different steel fiber contents of ultra-high-performance concrete appropriately to improve the seismic performance of the double-steel plate concrete shear wall.The steel fiber content in the concrete should be controlled within 0 to 4%.(4)The effect of different axial compression ratios on the seismic performance of the composite shear wall specimens was studied by changing the initial load.The study shows that when the axial compression ratio increases from 0.05 to 0.1,the peak load of the specimen increases by 11.4%,the ductility decreases from 3.2 to 2.3,and the stiffness increases by 34%.Therefore,selecting an appropriate axial compression ratio can effectively improve the seismic performance of the specimen.(5)Based on the formula for the shear carrying capacity of the double-steel plate concrete shear wall given in domestic and foreign specifications and research materials,the contribution of steel plate thickness,steel fiber content in concrete,and axial compression ratio to shear carrying capacity were analyzed.Relevant formulas and coefficients were adjusted to derive a formula for the shear carrying capacity of the thick double-steel plate concrete shear wall filled with ultra-high-performance concrete in the nuclear engineering field.