Experimental study on seismic behavior of steel column and steel plate RC composite wall coupled structure

Steel column and steel plate reinforced concrete (SPRC) composite wall coupled structural system consists of SPRC wall piers connected to steel columns on both sides through steel coupling beams. This novel structural system extends the application of the steel coupling beam-wall pier coupled system. The steel columns on both sides participate in overturning moment resistance by the tension-compression couple, ensuring the steel coupling beam and SPRC wall dual seismic fortification lines. In order to study the coupling mechanism of the steel column and SPRC wall coupled system, one 1/4 scaled 5-story test model with a coupling ratio of 0.45 was designed and constructed. The quasi-static experiment was conducted to examine the seismic performance in terms of hysteretic loops, skeleton curve, stiffness degradation, ductility, and damage development. The finite element analysis software ABAQUS was then used to simulate the experiment with validated numerical techniques. The test and analysis results show that the top steel link beam and wall of the coupled structural steel of steel column and steel plate concrete composite shear wall reach the yield state when the top lateral displacement is 21 mm and 65 mm, respectively. When the top lateral displacement is 102 mm, the plastic hinge is formed at the bottom of the wall to dissipate energy and the specimen reaches the predetermined yield sequence and damage mode, which realizes the double seismic protection line of steel link beam-single limb shear wall and achieves the coupling mechanism of joint limb shear wall.