基于透射信号的钢桥面板贯穿型裂纹超声检测方法研究
Ultrasonic Testing Method for Through-deck Cracks in Steel Bridge Decks Based on Penetration Signals
夏俊元 1吉伯海 1袁周致远 1高天1
作者信息
- 1. 河海大学土木与交通学院,江苏南京 210098
- 折叠
摘要
目的 提出一种基于超声波透射信号的钢桥面板贯穿型裂纹检测方法,提高在役钢桥隐蔽裂纹检测精度和效率.方法 采用数值分析方法研究了超声波在含裂纹面板中的传播机制,分析了不同裂纹参数与接收信号强度的变化规律,并通过顶板贯穿裂纹检测试验,进一步验证该检测方法的可行性.结果 裂纹检测参数建议激励晶片边长为4 mm、激励频率为5 MHz、K值为0.8;裂纹宽度小于0.1 mm时可忽略裂纹宽度对检出信号的影响,裂纹宽度大于0.1 mm时可将尖端反射信号作为判断依据;透射信号与裂纹深度呈负相关,恢复至最大值时的入射坐标与裂纹深度呈线性关系,作为裂纹深度的计算依据,检测误差在1 mm以内.结论 基于穿透信号的超声波检测方法,以恢复至最大值时的入射坐标为主要指标,可以实现钢桥顶板贯穿裂纹的有效检测.
Abstract
This study proposes a method for detecting through-deck cracks in steel bridge decks based on ultrasonic penetration signals,aiming to enhance the accuracy and efficiency of hidden crack detection in existing bridges.The propagation mechanism of ultrasonic waves in cracked decks was studied by the finite element method.The variation law of different crack parameters and received signal strength was analyzed.The feasibility and reliability of the detection method were further verified by a through-wall crack detection test.The recommended detection parameters are wafer side length of 4mm,excitation frequency of 5MH,and K value of 0.8.When the crack width is less than 0.1 mm,the influence of the crack width can be ignored,otherwise the crack width can be judged by reflection signal.The penetration signal is inversely related to crack depth.The incident coordinates at maximum restoration value are linearly related to crack depth with a error within 1 mm.The ultrasonic detection method based on penetration signals,with the incident coordinates at maximum restoration value as the primary indicator,can effectively achieve through-deck crack detection in steel bridge decks.
关键词
桥梁与隧道工程/钢桥面板/贯穿型裂纹/穿透法/超声波检测Key words
bridge and tunnel engineering/steel bridge deck/through-deck cracks/penetration method/ultrasonic testing引用本文复制引用
基金项目
国家重点研发计划(2017YFE0128700)
江苏省交通运输科技项目(2022Y19)
中央高校基本科研业务费专项(B230201034)
出版年
2024
NETL
NSTL
万方数据