混凝土圆拱结构强度安全与整体稳定关系研究

发布时间：2018-03-18 14:44

  本文选题：无铰圆拱　切入点：浅拱非线性屈曲理论　出处：《建筑结构》2017年S2期 　论文类型：期刊论文

【摘要】：针对圆拱结构强度安全与整体稳定关系进行了深入研究,基于结构力学的弹性中心法,得到无铰圆拱结构在法向均布荷载下拱冠处和拱端处的应力计算式,并依据《混凝土结构设计规范》(GB 50010—2010)给出强度安全系数;同时根据圆拱结构的经典屈曲理论和浅拱非线性屈曲理论,给出了圆拱结构最小临界屈曲荷载计算公式,由于结构整体屈曲失稳的突变性,参考国内外相关研究认为圆拱结构的屈曲稳定系数需满足Kcr≥1.5~3.0。根据圆拱结构强度安全与整体稳定的相对安全系数关系,结合MATLAB计算软件,分别对Kcr=1.5、3.0下,不同混凝土级别(C35、C50和C65)下圆拱结构强度安全与整体稳定临界情况下的圆拱结构半中心角α和厚径比T/R的查算关系曲线族,认为混凝土级别越高,越需要重视圆拱结构整体稳定的影响,为工程设计人员应用提供参考。
[Abstract]:The relationship between strength safety and overall stability of circular arch structure is studied in depth. Based on the elastic center method of structural mechanics, the stress calculation formula of arch crown and arch end under normal uniform load is obtained. According to the Code for Design of concrete structures (GB50010-2010), the strength safety factor is given, and the formula for calculating the minimum critical buckling load of circular arch structures is given according to the classical buckling theory of circular arch structures and the nonlinear buckling theory of shallow arch structures. Because of the sudden change of the buckling instability of the whole structure, it is considered that the buckling stability factor of circular arch structure should meet Kcr 鈮，

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