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| RC梁桥承载能力快速评定研究 |
| Study on rapid assessment of bearing capacity of RC girder bridge |
| 投稿时间：2024-02-21 修订日期：2024-04-09 |
| DOI： |
| 中文关键词: 裂缝特征 ABAQUS 简支梁 承载能力 |
| 英文关键词: Fracture characteristics ABAQUS simply supported beam Carrying capacity |
| 基金项目:公路改扩建项目既有桥梁下部结构原位利用与性能提升技术研究(2021-1-2)，山西交通控股集团有限公司基金项目(2022-JKKJ-16) |
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| 中文摘要: |
| 为了通过桥梁裂缝信息实现对桥梁承载能力评定，通过对某地区RC梁桥进行调研分析，结合相关规范，确定了以最大裂缝宽度、平均裂缝高度和平均裂缝间距为统计参数。通过有限元软件ABAQUS将三个因素进行模拟分析，采用拉丁超立方抽样得到三个因素的不同组合情况，最终得到不同裂缝特征参数下的抗弯承载率，通过SPSS软件进行多因素线性回归分析，得到裂缝特征参数和承载能力折减系数的数学表达式，进而得到裂缝特征与检算系数的对应关系，通过检测结果得到承载力恶化系数、截面折减系数等，进而通过结构抗力表达式进行验算，从而评定桥梁承载能力。以一座简支T梁桥为例，通过该方法评定，与荷载实验法结果进行对比验证。结果表明，该方法客观、可靠、经济性强。为在役混凝土梁桥的结构承载能力评定提供一种新方法。 |
| 英文摘要: |
| In order to evaluate the bearing capacity of the whole bridge through the crack information of the bridge, the maximum crack width, maximum crack height and average crack spacing were determined as the statistical parameters through the investigation and analysis of RC beam Bridges in a certain area, combined with relevant norms. The finite element software ABAQUS was used to simulate and analyze the three factors to obtain the flexural load ratio under different crack characteristic parameters. The multi-factor linear regression analysis was carried out by SPSS software to obtain the expression based on the crack index and the reduction coefficient of the bearing capacity, and then the corresponding relationship between the crack index and the checking coefficient of the bearing capacity of RC beam bridge is obtained. According to the experimental results, to obtain the coefficient of deterioration of bearing capacity and section reduction factor, and then the structural resistance expression is used to verify the calculated results,in order to evaluate the bearing capacity of the bridge. Take a simple support T-girder bridge as an example, and the calculated results are compared with the results of the load test . The results show that the method is reliable, objective and economical. This method can be used as a new method to evaluate the load-bearing capacity of in-service concrete girder bridge structures. |
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