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A simplified model for frame-core structures with single outrigger |
DENG Zhong-liang2,3, SUN Fei-fei1,2, LI Guo-qiang1,2 , SHENG-li2 |
1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China; 2. Building Department, College of Civil Engineering, Tongji University, Shanghai 200092, China; 3. China Architectural Design and Research Group, Beijing 100044, China |
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Abstract Regarding frame-core structures with single outrigger (SO-COS), a planar simplified model was established by introducing a bending spring to consider the contribution of exterior columns and outrigger to resisting overturning moment. With this model, the static behavior and global structural stability of SO-COS were analyzed, and an approximate theoretical solution to the fundamental frequency of SO-COS was obtained by means of Rayleigh energy method. Finally, the simplified model was compared with a 2D planer finite element model in terms of static response and dynamic property of an actual engineering project, showing that the static behavior and fundamental frequency of SO-COS can be effectively predicted by the simplified model with an accuracy satisfying the need of structural design.
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Published: 08 December 2011
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含单伸臂的框架-核心筒结构简化模型
对含单伸臂的框架-核心筒结构,将外柱和伸臂参与抵抗倾覆力矩的能力简化为抗弯弹簧,建立平面简化模型研究静力性能,分析伸臂设置对结构整体稳定性的影响.基于Rayleigh能量法提出求解单伸臂的框架-核心筒结构基本频率的近似理论解.针对某工程实例,对比分析理论简化模型和二维有限元模型的分析精度.结果表明,采用这种含弹簧的芯筒-刚臂结构简化模型既能准确分析该类结构的静力反应,又可以有效地估计其基本频率,计算精度满足工程结构设计的需要.
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