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基于裂缝特征库的混凝土梁桥承载能力快速评定

Keywords: 桥梁工程,混凝土梁桥,截面非线性分析,承载能力快速评定,裂缝特征库,安全预警

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Abstract:

?为快速评定混凝土梁桥的承载能力,采用截面非线性全过程分析方法,得到通用图中桥梁关键截面的弯矩与开裂高度的对应函数,并建立裂缝特征库;根据更详细的裂缝调查和预先构建的裂缝特征库及效应或抗力库,通过查图表确定新的承载能力检算系数Z3,嵌入中国规范体系,并对抗力进行修正,从而实现对混凝土梁桥承载能力的快速、准确评定。研究结果表明:对于RC梁桥,稳定的裂缝高度也可能蕴藏很大危险;对于PC梁桥,利用裂缝高度评估结构承载能力是否满足规范要求的方法适宜性较好;提出的方法可预警普通钢筋和预应力钢筋是否屈服,从而确定是否需要限制交通或封闭交通,尤其在桥梁安全预警、大件运输及旧、危桥改造等领域具有明显优势。

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