Study On Seismic Behavior Of Inline Composite Ceramsite Concrete And Thin Steel Plate Shear Walls

Ceramsite concrete is a light-weight,energy-saving and environmentally friendly green building material.Can be used as a structural material in the field of building structure,but low strength,large deformation and shrinkage,make it not widely used.The steel plate composite shear wall has good bearing performance and can be modularized and efficiently constructed.In recent years,applied in the fields of prefabricated buildings and super high-rise buildings.Using the steel plate restraint to improve the performance of ceramsite concrete,overcome the application defects,and form a lightweight,highstrength,energy-saving and environmental friendly composite shear wall,is a structure worth studying.However,there are few relevant studies and no corresponding structural design specifications.In this paper,the seismic behavior of the ceramsite concrete steel plate composite shear wall under low-cycle reciprocating load.Based on the experimental research,the Open Sees fiber model is established for numerical simulation.The validity of the analysis model is verified by comparing with the test results.The Open Sees fiber model for parameter analysis to study the seismic behavior of the axial compression ratio,shear span ratio,and section width to thickness ratio.The comparative analysis of the seismic performance difference between the ceramsite concrete steel plate composite shear wall and other types of shear walls.The main content of this article are as follows:(1)Designed 7 ceramsite concrete steel plate composite shear wall specimens with pull bolts and 1 ceramsite concrete steel plate composite shear wall specimens with Lshaped stiffeners.The effects of axial compression ratio,shear-span ratio,cross-section width-to-thickness ratio,infill concrete type and cross-section form on the seismic performance of the specimen were analyzed specifically.The test results show that the buckling of the outer steel plate of the test piece and the failure of the in-filled concrete are concentrated in the corner regions on both sides of the lower part of the wall.The peak load decreases with the increase of the shear span ratio and the decrease of the section width to thickness ratio,and the axial compression ratio changes It has little effect on the bearing capacity and lateral stiffness of the specimen.The bearing capacity of the ceramsite concrete specimen is closer than that of the ordinary concrete specimen.The strength of the former is degraded faster and the latter is more ductile.(2)The OpenSees finite element analysis program was used to establish the numerical analysis model of steel plate composite shear wall and reinforced concrete shear wall,and the fiber model was used to simulate steel and concrete.It is assumed that concrete and steel plate work together without bonding slip.The comparison between the test results and the numerical simulation results shows that the Open Sees fiber model can effectively reflect the mechanical properties of the test piece,the parameter analysis conclusion is consistent with the test conclusion,and the value of the design axial compression ratio is recommended to not exceed 0.4.Under the same steel ratio of the same section.The combined steel plate and ceramsite concrete can effectively improve the bearing capacity of the component.The horizontal bearing capacity of the ceramsite concrete component and the ordinary concrete component are close,but the lateral stiffness of the ceramsite concrete component is lower than that of the ordinary concrete component,and the ductility is worse.