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钢箱混凝土组合拱桥施工过程中温度效应分析

DOI: 10.3969/j.issn.1674-0696.2014.06.07, PP. 27-33

Keywords: 桥梁工程,拱桥,钢-混凝土组合结构,温度效应,bridgeengineering,archedbridge,steelconcretecompositestructure,temperatureeffect

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Abstract:

:？钢箱-混凝土组合拱桥施工过程中在整体温度变化和日照温度变化作用下的应力及变形影响不可忽略。以重庆江津笋溪河大桥为例，对施工过程中整体温度变化和日照温度变化作用下的主拱应力、结构变形及温度场分布进行研究。结果表明：整体温变作用下应力和变形随温度增加而增加，空钢箱阶段最不利位置位于拱脚处，最大应力增量达40MPa，主拱成型阶段最不利位置位于主拱3/8L处，最大应力增量达25MPa；日照作用下，成拱后钢箱-混凝土组合结构拱桥由于内部混凝土的热传导作用，钢箱与混凝土的温度及应力相对均匀，钢箱两侧温度基本相等，钢箱上下缘有一定的温度差。

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