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既有钢筋混凝土拱肋破坏过程中的内力变化

, PP. 68-73

Keywords: 桥梁工程,钢筋混凝土拱肋,模型修正,极限承载能力,损伤

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Abstract:

对某既有钢筋混凝土拱肋的试验结果进行了较详尽的研究。首先基于静力和模态试验得出,既有拱肋的刚度并非一致下降,而具有波动变化的特征。然后基于模型修正技术,通过不断调整结构刚度参数以获得与试验结果相一致的策略,计算了该拱肋的初始刚度分布和加载各阶段的刚度分布。在此基础上研究了既有钢筋混凝土拱肋破坏过程中内力变化的一些规律。最后利用这些成果进行了极限荷载验证。结果表明基于内力变化规律来推求极限荷载的方法具有较高精度。

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