吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (6): 1650-1657.doi: 10.13229/j.cnki.jdxbgxb.20230152

• 交通运输工程·土木工程 • 上一篇    

基于裂缝宽度变化的连续刚构桥安全性预警技术

王华1(),王龙林1,张子墨2,何昕3()   

  1. 1.广西交科集团有限公司 桥梁工程研究院，南宁 530007
    2.广西大学 土木建筑工程学院，南宁 530004
    3.吉林大学 交通学院，长春 130022
  • 收稿日期:2023-02-01 出版日期:2023-06-01 发布日期:2023-07-23
  • 通讯作者: 何昕 E-mail:939156574@qq.com;hexin@jlu.edu.cn
  • 作者简介:王华（1989-），男，高级工程师，博士.研究方向：桥梁智能化监测.E-mail：939156574@qq.com
  • 基金资助:
    国家重点研发计划项目(2021YFB2600604);广西重点研发计划项目(2021AB22121)

Safety early warning technology of continuous rigid frame bridges based on crack width variation

Hua WANG1(),Long-lin WANG1,Zi-mo ZHANG2,Xin HE3()   

  1. 1.Bridge Engineering Research Institute，Guangxi Transportation Science and Technology Group Co. ，Ltd. ，Nanning 530007，China
    2.School of Civil Engineering and Architecture，Guangxi University，Nanning 530004，China
    3.College of Transportation，Jilin University，Changchun 130022，China
  • Received:2023-02-01 Online:2023-06-01 Published:2023-07-23
  • Contact: Xin HE E-mail:939156574@qq.com;hexin@jlu.edu.cn

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摘要：

为了剔除温度变化对连续刚构桥裂缝宽度的影响，提高通过裂缝宽度变化评估桥梁安全性的效率和准确性，以广西省境内一座刚构桥为研究对象，分别建立了全桥整体模型和带裂缝梁段精细化模型，根据跨层级模型计算结果研究了温度与裂缝宽度变化之间的关系。结果表明：均匀温度和梯度温度作用均对裂缝宽度变化存在影响，利用修正后考虑混凝土材料特性变化的关系式可以快速确定温度变化导致的裂缝宽度变化值，为桥梁安全性预警提供重要依据。最后，将本文方法应用于某桥工程实例，通过实测数据验证了该方法的准确性。

关键词: 桥梁工程, 刚构桥, 裂缝宽度, 温度变化

Abstract:

In order to eliminate the influence of temperature variation on crack width of continuous rigid frame bridges and improve the efficiency and accuracy of evaluating bridge safety through crack width variation， a rigid frame bridge in Guangxi Province was taken as the research object. The whole bridge model and the refined model of beam segment with cracks were established respectively. The relationship between temperature and crack width variation was studied according to the calculation results of cross-level model. The results show that both the uniform temperature and the gradient temperature action have an effect on the crack width variation. The modified formula considering the change of concrete material characteristics can be used to quickly determine the crack width variation caused by temperature change， which can provide an important basis for bridge safety early warning. Finally， the proposed method is applied to Luotianle Bridge project， and the accuracy of this method is verified by measured data.

Key words: bridge engineering, rigid frame bridge, crack width, temperature variation

中图分类号: 

  • U446

图1

刚构桥及合拢段底板处裂缝图"

图2

刚构桥上传感器布置"

图3

2022年6月内裂缝宽度和温度变化趋势"

图4

刚构桥整体模型"

表1

均匀升温下内力值"

（ΔT2=ΔT1）/℃轴力/kN剪力/kN弯矩/（kN·m）
0000
1-11.85-1.60-214.26
2-23.71-3.20-428.53
3.5-41.48-5.60-749.93
5-59.26-8.00-1071.32
6-71.11-9.60-1285.59
7-82.97-11.21-1499.85
8.5-100.75-13.61-1821.25
10-118.52-16.01-2142.65
11-130.38-17.61-2356.91
12-142.23-19.21-2571.18
13.5-160.01-21.61-2892.58
15-177.79-24.01-3213.97
16-189.64-25.61-3428.24
17-201.49-27.21-3642.50
18.5-219.27-29.61-3963.90
20-237.05-32.02-4285.30
22-260.75-35.22-4713.83
24-284.46-38.42-5142.36
25-296.31-40.02-5356.62
27-320.02-43.22-5785.15

表2

梯度升温下内力值"

（ΔT1-ΔT2）/℃轴力/kN剪力/kN弯矩/（kN·m）
0000
1-20.52-18.707 045.34
2-41.05-37.4114 090.68
3.5-71.83-65.4624 658.68
5-102.62-93.5235 226.69
6-123.14-112.2242 272.03
7-143.67-130.9249 317.37
8.5-174.45-158.9859 885.38
10-205.24-187.0470 453.38
11-225.76-205.7477 498.72
12-246.29-224.4484 544.06
13.5-277.07-252.5095 112.07
15-307.86-280.55105 680.07
16-328.39-299.26112 725.41
17-348.91-317.96119 770.75
18.5-379.69-346.02130 338.76
20-410.48-374.07140 906.77
22-451.53-411.48154 997.45
24-492.58-448.88169 088.12
25-513.10-467.59176 133.46
27-554.15-504.99190 224.14

图5

带裂缝梁段精细化模型"

图6

均匀降温1 ℃下裂缝两端位移计算结果"

表3

均匀温度下的裂缝宽度变化值"

（ΔT2=ΔT1）/℃Δw/mm（ΔT2=ΔT1）/℃Δw/mm
0013.5-0.016 150
1-0.001 19615-0.017 940
2-0.002 391 516-0.019 141
3.5-0.004 18517-0.020 337
5-0.005 98118.5-0.022 131
6-0.007 17520-0.023 925
7-0.008 37422-0.026 312
8.5-0.010 16924-0.028 700
10-0.011 96225-0.029 901
11-0.013 15827-0.032 292
12-0.014 354——

图7

表3结果趋势图"

表4

梯度温度下的裂缝宽度变化值"

（ΔT1-ΔT2）/℃Δw/mm（ΔT1-ΔT2）/℃Δw/mm
0013.50.465 40
10.034 487150.517 10
20.068 970160.551 70
3.50.120 69170.585 30
50.172 4218.50.638 00
60.206 92200.689 50
70.241 47220.757 60
8.50.293 14240.827 60
100.344 86250.862 20
110.379 31270.930 80
120.413 90——

图8

表4结果趋势图"

图9

杆系结构微段弯曲变形示意图"

图10

裂缝宽度变化值拟合结果"

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