基于高效精细化连梁计算单元的高层结构核心筒地震行为模拟

Seismic behavior simulation of high-rise core tube structures based on an accurate and efficient element for reinforced concrete coupling beams

钢筋混凝土联肢剪力墙和核心筒在多高层结构体系中有着广泛应用。本文基于所开发的用于钢筋混凝土连梁地震反应分析的考虑非线性剪切的纤维梁单元,结合常规不考虑非线性剪切的纤维梁单元和分层壳单元,在通用有限元软件MSC.MARC(2007r1)平台上建立了一种新的联肢剪力墙和核心筒分析模型。模型分别采用所开发连梁单元、分层壳单元和常规纤维梁单元模拟钢筋混凝土连梁、剪力墙和边缘约束构件,具有高效、准确、建模方便的特点。首先利用相关联肢墙拟静力试验验证模型的准确性。随后对一31层高的核心筒结构进行地震反应模拟,重点对地震激励过程中核心筒内各处连梁的受力规律进行了详细分析,并与采用分层壳单元的计算模型进行了对比。本文提出的联肢剪力墙、核心筒计算模型为基于通用有限元软件平台的高层结构体系弹塑性分析提供了一种新的工具。

Reinforced concrete coupled shear walls and core tubes have been widely used in multi-story and high-rise structural systems. Based on the previously developed fiber beam-column element including nonlinear shear effects for reinforced concrete coupling beam,a new analysis model is proposed for the coupled wall by combining it with the conventional fiber beam-column element and layered shell element. The model is efficient,accurate and convenient,which is applied in the general finite element package MSC. MARC( 2007r1). The proposed coupling beam element,layered shell element and conventional fiber beam-column element were used to model the coupling beam,shear wall and the boundary confining column,respectively. The numerical model for the coupled wall was established and verified by experimental results. Then the model was applied to the seismic analysis of a 31-story high core tube structure. The seismic behavior of coupling beams were intensively analyzed and the model was compared to the model with layered shell element. The proposed analysis model of coupled wall and core tube provides a new tool for the nonlinear analysis of multi-story and high-rise structures based on general finite element software.