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Nonlinear inelastic simulation of high‐rise buildings with innovative composite coupling shear walls and CFST columns

This paper investigates the behavior of high‐rise composite buildings with composite shear walls and concrete‐filled steel tubular (CFST) columns using a numerical model in OpenSees. In the model, the geometric and material nonlinearity of structural elements are captured by utilizing a fiber force‐based beam‐column elements with rigorously modified material stress–strain relationships. Besides, the confining effect of the concrete core, the semi‐rigid connections, and the coupling effect of composite shear walls is carefully taken into consideration. Finally, the case study of a 42‐storey composite building is conducted using the proposed model to provide a thorough understanding about the behavior of this kind of building. It shows that this innovative building has high loading capacity and significantly reduces the dimension of structural members (up to 50%) compared with the conventional RC building at the same loading capacity. Through the validation with test data, the suggested constitutive laws have shown the simplicity and high accuracy since the value of model error is only around 7%. In addition, the simulation results also indicate that the model can capture well the nonlinear behavior of tested specimens, especially, the failure and the formation of plastic hinges of coupling composite shear walls implicitly.