Seismic Performance Analysis of Welded Multi-Cavity Double Steel Plate-Concrete Composite Shear Wall

Most double steel plate-concrete composite shear walls use bolted or welded ribs to make the steel plate and concrete work together. However, this connection method may lead to low integrality and plastic deformation efficiency, as well as complex fabrication. Welded multi-cavity double steel plate-concrete composite shear walls are able to avoid these problems effectively. In order to investigate the seismic performance of welded multi-cavity double steel plate-concrete composite shear wall, a three-dimension solid-shell model of composite shear wall is established by using the constrained concrete true triaxial plasticity-damage constitutive model and the steel elastoplastic hybrid strengthening-ductile damage constitutive model. The hysteresis curve, skeleton curve,stiffness degradation curve, elastic stiffness, bearing capacity, cumulative energy dissipation, equivalent damping viscosity coefficient and ductility coefficient obtained by the model are in good agreement with the existing quasistatic test results. The analysis results show that: (1) the axial compression ratio has little effect on the elastic stiffness and bearing capacity of the composite shear wall model, while the stiffness and bearing capacity of the composite shear wall model decrease linearly with the increase of shear span ratio; (2) the axial compression ratio has little effect on the total plastic energy dissipation of the composite shear wall model, while the shear span ratio has a greater effect, and the total plastic energy dissipation of the shear wall decreases with the increase of shear span ratio; and (3) both the axial compression ratio and the shear span ratio do not change the energy dissipation allocation mechanism of each component of the shear wall model, which means that the energy dissipation of the composite shear wall model is mainly due to the outer steel plate and the inner partition.