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基于裂缝指标的RC梁桥承载力检算评定

, PP. 87-90

Keywords: 桥梁工程,RC梁桥,层次分析法,承载力评估,裂缝指标,检算系数

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Abstract:

为利用裂缝信息实现对RC梁桥承载力的定量评估,将裂缝参数通过合适的方式进行无量纲化。根据裂缝对RC梁桥承载力的影响程度,选择裂缝的间距、宽度和高度作为参数;提出利用这3个统计参数与各自的权重值来表征结构裂缝指标,运用层次分析法确定各参数的权重,得出裂缝指标的计算表达式;对大量实际裂缝进行调查统计分析,得出裂缝指标与RC梁桥承载力检算系数的对应关系,通过结构抗力表达式进行结构检算,最终对桥梁承载力作出评定。以一座简支T梁桥为例,运用该方法进行承载力检算评定,所得结果与原桥荷载试验结果进行对比表明该方法结果可靠,简便易行,经济性强,可以用于RC梁桥的承载力快速检算评定。

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