摘要
针对传统桥梁索(杆)力测试难度大、传感器易损坏等问题,提出一种基于数字图像相关(DIC)技术的非接触式桥梁索(杆)力测试和计算方法。该方法采用DIC技术对固定高速摄像机拍摄的索(杆)振动目标点进行图像追踪,获得索(杆)上目标点的位移时程响应信息,再结合运行模态分析和索(杆)力反演计算实现索(杆)力求解。将该方法应用于某斜拉桥及某吊杆拱桥的索(杆)力计算中,并与加速度法实测索(杆)力进行对比。结果表明:以固定高速摄像机为硬件,基于DIC技术得到的功率谱密度曲线的各固有频率与加速度法测量结果基本一致,二者测量索(杆)力偏差在7.87%以内;所提方法具有现场操作简便、结果准确等优势,为桥梁的索(杆)力非接触检测提供了良好的技术支撑。
This paper presents a digital image correlation(DIC)based non-contact suspender(cable)tension testing and calculation approach,which facilitates the testing of difficult-to-access suspenders(cables)and reduces the utilization of sensors.This approach offers real-time images of the targeted vibration locations in the suspenders(cables)captured by the high-speed cameras.The displacement time-history responses of the targeted locations in the suspenders(cables)are obtained.Combined with the operation modal analysis and inverse calculation,the tensions of suspenders(cables)are resolved.This approach has been applied in the calculation of the cable tensions of a cable-stayed bridge and suspender tensions of an arch bridge,and the calculated tensions were compared with the results of the acceleration method.It is shown that with a fixed high-speed camera as the hardware,the natural frequencies in the power spectral density(PSD)curves based on the DIC technology are basically in agreement with those measured by the acceleration method,with a measurement deviation within 7.87%,proving that the proposed approach is an easy-to-practice and accurate non-contact inspection of the tensions of suspenders(cables)of bridges.
作者
孙晓立
杨军
张玉珠
陈贡发
杜永潇
SUN Xiaoli;YANG Jun;ZHANG Yuzhu;CHEN Gongfa;DU Yongxiao(Guangzhou Municipal Engineering Testing Co.,Ltd.,Guangzhou 510520,China;Guangzhou Municipal Construction Group Co.,Ltd.,Guangzhou 510030,China;Guangdong University of Technology,Guangzhou 510006,China)
出处
《桥梁建设》
北大核心
2025年第3期81-88,共8页
Bridge Construction
基金
广东省住房和城乡建设厅2022年科技创新计划项目(2022-K4-181935)
广州市建筑集团有限公司科技计划项目([2022]-KJ021,[2023]-KJ010,[2023]-KJ012)。
关键词
索杆体系桥梁
索(杆)力测试
数字图像相关技术
运行模态分析
固定高速摄像机
计算方法
suspender(cable)system bridge
suspender(cable)tension testing
digital image correlation technique
operational modal analysis
fixed high-speed camera
calculation method
