基于简化模型的钢框架-混凝土核心筒混合结构竖向变形计算

VERTICAL DEFORMATION CALCULATION OF STEEL FRAME-CONCRETE CORE WALL HYBRID STRUCTURE BASED ON SIMPLIFIED MODEL

目前考虑收缩徐变影响的钢框架-混凝土核心筒混合结构竖向变形的研究,大多是通过建立较为复杂的有限元模型进行分析,而通过简化分析的研究则很少。着眼于工程实际应用,提出简化模型,通过简化分析来研究考虑收缩徐变影响的钢框架-混凝土核心筒混合结构竖向变形。首先建立钢框架-混凝土核心筒混合结构的简化模型,基于简化模型推导考虑收缩徐变影响的楼层竖向位移及钢框架柱与核心筒竖向位移差简化计算公式,然后依据大连远洋大厦结构模型,用简化分析方法分析了该结构的竖向变形特征,并以MIDAS/Gen分析所得的结构竖向变形为基准,考察了简化分析的准确性。结果表明:基于简化分析的竖向位移及竖向位移差随楼层的变化规律与有限元分析结果基本相同,误差在工程可接受的范围内。

The present researches on vertical deformation of steel frame-concrete core wall hybrid structure considering creep and shrinkage are usually conducted by complex finite element model,while the researches conducted by simplified analysis are rare.Focusing on actual application,a simplified model was presented in the paper,which was used to calculate the vertical displacement of steel frame-concrete core wall hybrid structure considering creep and shrinkage.Based on the simplified model,the formulas of the vertical floor displacement and relative vertical floor displacement were firstly derived.To investigate the accuracy of simplified analysis,based on the steel frame-concrete core wall hybrid structure model of a Yuanyang Building,the vertical deformation was calculated by simplified analysis and MIDAS/Gen finite element method as comparison.The results showed that the trends of vertical floor displacement and relative vertical floor displacement obtained by simplified analysis and finite element method respectively were the same.And the error was acceptable for actual application.The research results could be applied to practical engineering.