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工程科学与技术:2021,53(6):165-174
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基于挠度曲率面积差的桥梁结构损伤识别方法
(1.重庆交通大学 省部共建山区桥梁及隧道工程国家重点实验室,重庆 400074;2.深圳大学 土木与交通工程学院,广东 深圳 518060)
Deflection Curvature Area Difference Method for Damage Location of Bridge Structures
(1.State Key Lab. of Mountain Bridge and Tunnel Eng., Chongqing Jiaotong Univ., Chongqing 400074, China;2.School of Civil and Transportation Eng., Shenzhen Univ., Shenzhen 518060, China)
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投稿时间:2020-10-28    修订日期:2021-03-24
中文摘要: 挠度信息是桥梁健康监测的基础数据,能够为桥梁安全状态评价提供可量化的数据。本文通过分析挠度与其1、2阶导数(转角和曲率)之间的关系,提出一种利用损伤前后荷载挠度曲线的曲率面积差参数ΔAκ识别结构局部刚度损伤的方法。该方法采用测点数量将损伤前后的曲率曲线所围成的面积划分为若干单元,将各单元面积的平方与所有单元面积平方和的比值作为损伤定位参数,利用该参数的峰值定位结构损伤位置。作为理论实例,在一座简支T梁桥的有限元模型中设置不同程度(5%~50%)和不同数量的局部刚度损伤,以各单元的曲率面积差为参数,准确定位桥梁结构损伤位置。同时,对一座有机玻璃模型桥进行损伤识别试验。结果表明:损伤位置处的曲率面积差远远大于未损伤位置,能够准确定位结构中微小程度的局部刚度损伤;且不同损伤程度下的曲率面积差与损伤程度无关,即使有测量噪声的情况下也能清晰定位出损伤位置。该方法有助于提高桥梁日常安全巡检的效率,量化检测数据,客观化识别结果,推动在实际桥梁工程中的应用。
Abstract:Deflection is the basic data of bridge health monitoring. It can provide quantitative information for both structural safety evaluations and maintenance purposes. By analyzing the relationship between the displacement and its first and second derivatives (inclination and curvature), a method to detect the local stiffness damage of the structure by using the area difference of curvature of the deflection curve before and after the damage was proposed. The area enclosed by the curvature curves before and after damage was divided into several elements, and the ratio of the square of each element area to the sum of the square of all elements area was used as the damage location parameter ΔAκ. The peak value of ΔAκ can locate the damage. As a theoretical example, a simply supported T–beam bridge model with different degrees (5%~50%) and different numbers of local stiffness damage was simulated. By calculating ΔAκ value of each element, the damage in the structure was accurately detected. The method was also applied on a PMMA model bridge in the laboratory. The results showed that ΔAκ value at the damage location was much larger than that at the undamaged location, which could accurately locate the minor local stiffness damage in the structure, and ΔAκ was independent of the damage degree. The damage could be clearly located even in the case of measurement noise. This method is helpful to improve the efficiency of daily safety inspection of bridge, quantify the inspection data, objectify the identification results, and promote the application in actual bridge engineering.
文章编号:202000922     中图分类号:    文献标志码:
基金项目:国家自然科学基金项目(51708068;51778094)
作者简介:第一作者:吴桐(1993-),女,博士生.研究方向:桥梁健康监测与损伤识别.E-mail:wutongwtt@qq.com;通信作者:唐亮,E–mail:tangliang@cqjtu.edu.cn
引用文本:
吴桐,唐亮,周志祥.基于挠度曲率面积差的桥梁结构损伤识别方法[J].工程科学与技术,2021,53(6):165-174.
WU Tong,TANG Liang,ZHOU Zhixiang.Deflection Curvature Area Difference Method for Damage Location of Bridge Structures[J].Advanced Engineering Sciences,2021,53(6):165-174.