基于裂缝特征库的混凝土梁桥承载能力快速评定

发布时间：2018-04-16 15:21

本文选题：桥梁工程 + 混凝土梁桥　；参考：《中国公路学报》2014年08期

【摘要】：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。
[Abstract]:In order to quickly evaluate the bearing capacity of concrete beam bridge, the nonlinear full-process analysis method is used to obtain the corresponding function between the bending moment and the crack height of the key section of the bridge in the general drawing, and the crack feature library is established.According to the more detailed crack investigation and the pre-constructed crack signature and effect or resistance database, the new load-carrying capacity checking coefficient Z3 is determined by checking the chart, which is embedded in the Chinese code system, and the adversarial force is revised.Thus, the bearing capacity of concrete beam bridge can be evaluated quickly and accurately.The results show that: for RC girder bridge, the stable crack height may also be very dangerous, for PC beam bridge, the method of evaluating the bearing capacity of the structure by using the crack height is more suitable.The proposed method can warn the yield of common steel bar and prestressed steel bar, and determine whether it is necessary to restrict traffic or close traffic, especially in the field of bridge safety warning, large part transportation and old, dangerous bridge reconstruction and so on.
【作者单位】：长安大学公路学院;长安大学桥梁结构安全技术国家工程实验室(长安大学基地);
【基金】：国家自然科学基金项目(50808019) 河南省交通运输厅科技计划项目(2010P217,2013Z13-1) 中央高校基本科研业务费专项资金项目(CHD2012JC077,CHD0009-2014G2210001)
【分类号】：U441.2

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