Experimental and numerical study on seismic behavior of shear wall with cast-in situ concrete infilled walls

The shear wall system with cast-in situ concrete infilled walls has been widely used in high-rise buildings due to its significant advantages in construction. In this paper, quasi-static tests were conducted on the shear walls with and without cast-in situ concrete infilled walls to analyze their failure modes, load-bearing capacity, stiffness, energy dissipation capacity, and ductility. A simplified model of the shear wall with cast-in situ concrete infilled walls was proposed based on the fiber element model in OpenSees. The test results showed that the shear wall specimens with cast-in situ concrete infilled walls exhibited full-section compression or tension failure, and the cast-in situ concrete infilled walls did not show obvious damage. Compared with the shear wall without infilled walls, the overall stiffness, load bearing capacity, and energy dissipation capacity of the shear wall specimens with cast-in situ concrete infilled walls improved, indicating better seismic performance than those without infilled walls. Comparison between the hysteresis and skeleton curves derived from the tests and those simulated by the proposed simplified model revealed errors within 15% for stiffness, yield bearing capacity, and ultimate bearing capacity for shear walls with cast-in situ concrete infill walls, affirming the effectiveness and accuracy of the model.