Experimental Research on Compression-Bending Behavior of Composite Shear Walls with Lattice Columns by Using Mortise-Tenon Connections

In order to advance the research on prefabricated shear walls， this paper proposes a new type of steel-concrete composite shear wall consisting of concrete-filled steel tubes and steel batten-plates using mortise-tenon connections. Four specimens were designed and tested under monotonic horizontal loading to study their compression-bending performance. The experimental results indicated that when the composite shear wall failed， the square steel tube columns on both sides yielded， with weld fracture occurring at the bottom of the tensile square steel tube column and varying degrees of local buckling appearing at the bottom of the compressive column， while the crack propagation in the exposed concrete of the middle of the tested walls was not serious， indicating effective damage control. By reducing the shear-span ratio or increasing the wall thickness of the square steel tube， the stiffness and horizontal bearing capacity of the specimen were significantly improved， and the crack propagation was suppressed. In addition， the local reinforcement at the bottom of the column exhibited the most significant improvement in the performance of the specimen. The average value of the ultimate drift angle was 1/39， and the ductility factor was 3.56. A finite element model was established and validated against the test results， with the deviation analysis showing that the model is reasonable and reliable for subsequent parametric studies.