大跨度网架与下部支承结构协同作用分析
- 摘 要
-
（上海弘城国际建筑设计有限公司，上海 200082）［摘要］结合结构体系为钢网架-钢筋混凝土框剪混合结构的实际工程项目，充分考虑网架与下部支承结构的协同作用，采用MIDAS/Gen软件建立钢网架与下部钢筋混凝土结构的整体分析模型，进行反应谱分析与弹性时程分析，并对两次计算的结果进行对比及包络设计，精确提取网架各支座节点的内力与位移。将各节点力和位移精确地施加在由SATWE软件建立的钢筋混凝土结构单体模型和由MIDAS/Gen软件建立的单独网架模型上，对单体模型和单独网架模型进行分析计算。并将整体模型的计算结果与单体模型和单独网架模型的计算结果进行对比。结果表明，钢筋混凝土结构可以采用单体模型进行分析计算和设计，而网架设计需采用整体模型以体现网架与下部支承结构的协同作用。［关键词］钢网架-钢筋混凝土框剪混合结构; 整体模型; 协同作用; 弹性时程分析; MIDAS/Gen; SATWE中图分类号：TU398 文献标识码：A 文章编号：1002-848X(2014)23-0049-05Analysis on interaction between large-span grid and supporting structure of lower partZhao Yongquan, Ren Yuhe, Ren Yuan(Shanghai Grandcity International Architectural Design Co., Ltd., Shanghai 200082, China)Abstract: Combined with the practical project whose structural system is steel grid-RC frame shear wall mixed structure, considering the interaction between grid and supporting structure of lower part, whole analysis model composed of steel grid and RC structure of lower part was established by the general finite element program MIDAS/Gen to carry out the response spectrum analysis and the elastic time-history analysis. The results of two analyses were compared and envelope design was carried out. The internal force and displacement of each support node of the grid structure were accurately extracted. The extracted node force and displacement were accurately applied in single RC structure model by SATWE program and single grid model by MIDAS/Gen program and two models were calculated separately. The results of the whole model and two single models were compared. The results show that RC structure can be calculated by a single model, and the grid design should use the whole model to consider the interaction between grid and supporting structure of lower part.Keywords: steel grid-RC frame shear wall mixed structure; whole model; interaction; elastic time-history analysis；MIDAS/Gen; SATWE作者简介:赵永全,硕士,工程师,Email:Trevor_zhao@163.com。参考文献［1］陈丹, 杨维国, 赵雅, 等. 海原博物馆上下部结构协同工作性能研究［J］. 建筑结构, 2011，41(3):50-54.［2］王昌兴. MIDAS/Gen应用实例教程及疑难解答［M］. 北京: 中国建筑工业出版社, 2010.［3］董石麟, 钱若军. 空间网格结构分析理论与计算方法［M］. 北京: 中国建筑工业出版社, 2000.［4］GB 50011—2010 建筑抗震设计规范［M］.北京：中国建筑工业出版社,2010.
