Experimental study and numerical simulation on seismic behavior of double-skin composite wall

An innovative double-skin composite wall (DSCW) with L-shaped connectors which can be quickly assembled and simply constructed was proposed. Taking the boundary column length and shear span ratio of the wall as parameters, the failure mode and seismic behavior of the composite shear wall were studied through quasi-static tests of four specimens. Based on the open-source software, OpenSees, the fiber model of the DSCW with Lshaped connectors was established, and the parametric study applied for the fiber model. The common failure phenomenon of each specimen lied in the steel plate tearing at the bottom of the end column, the concrete crushing at the tearing place, and local bulging at the bottom of the steel plate. Test results showed this type of composite shear wall had excellent bearing capacity and ductility, and the peak load range is 734.2 kN-991.3 kN, and the ductility coefficient is between 3.07 and 4.70. According to the analysis of the test results, the deformation performance and bearing capacity of the specimen were affected by both the length and the length -thickness ratio of the boundary column; the change in the shear-span ratio significantly affected the stiffness of the specimen in the elastic stage. With the comparison of the simulation results and the test data, the difference between the peak loads is less than 6%, which verifies the correctness of the model. Thus, taking the specimen model as the benchmark model, the parameters of the model were analyzed, as the supplementary verification of test results.