![]() In addition, the design strength models were suggested for predicting the shear and flexure peak strength values of RCSPSW systems, and their applicability and reliability were verified by comparing with test results. The axial compressive load was found to have an indispensable effect on the ductility of both RCSW and RCSPSW, and an upper limit of axial compression ratio (0.5) is recommended for the application of HS RCSPSW in engineering practices. The test results indicated that high-strength (HS) RCSPSW system showed superior lateral load strength and acceptable deformation capability. The progression of damage, failure modes, and load-displacement responses of test specimens were studied and compared based on experimental observations. Two sets of wall specimens with different aspect ratios (height/width, 1.5 and 2.7) were constructed and tested under quasi-static reversed cyclic loading, including five reinforced concrete shear walls (RCSW) and six reinforced concrete-steel plate shear walls (RCSPSW). This paper presents an experimental study of the seismic performance of a composite shear wall system that consists of high-strength concrete walls with the embedded steel plate. Shear walls are effective lateral load resisting elements in high-rise buildings. The predictions for the effective stiffness correlate well with the results of a series of tests on composite shear walls. The total effective stiffness is obtained by combining the effective shear stiffness and the effective flexural stiffness, in which the flexural stiffness can be obtained by the fibre model. The formula for calculating the effective shear stiffness of the composite shear wall is derived based on this model. Despite many design practices addressing the shear stiffness by employing a stiffness reduction factor, a model named as plane combination truss model (PCTM) for the effective shear stiffness of the composite wall is proposed based on the theory of the fixed angle truss model in this paper. This paper focuses on the effective stiffness of the composite shear walls. They were developed to enlarge the building space, and to delay the appearance of cracks by using the steel plates as formwork. The composite shear walls with double steel plates and filled concrete are composed of two steel plates with studs inside, side columns made of steel tubing, and an infill of concrete. Shear walls are the primary lateral load-carrying elements in tall buildings.
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