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.

中文翻译：

---

具有创新复合耦合剪力墙和 CFST 柱的高层建筑非线性非弹性模拟

本文使用 OpenSees 中的数值模型研究具有复合剪力墙和钢管混凝土 (CFST) 柱的高层复合建筑的行为。在该模型中，结构元素的几何和材料非线性是通过利用基于纤维力的梁柱单元与严格修改的材料应力-应变关系来捕获的。此外，还仔细考虑了混凝土核心的约束效应、半刚性连接以及组合剪力墙的耦合效应。最后，使用所提出的模型对 42 层复合建筑进行案例研究，以全面了解此类建筑的行为。这表明该创新建筑具有高承载能力，与相同承载能力的传统钢筋混凝土建筑相比，结构构件的尺寸显着减少（高达50%）。通过对测试数据的验证，由于模型误差值仅在 7% 左右，建议的本构律显示了简单性和高精度。此外，仿真结果还表明，该模型能够很好地捕捉试件的非线性行为，尤其是隐式耦合复合剪力墙的破坏和塑性铰的形成。