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钢管混凝土拱桥界面脱空光纤传感研究
引用本文:丁睿,刘浩吾,罗凤林,牟廷敏,侯静.钢管混凝土拱桥界面脱空光纤传感研究[J].实验力学,2004,19(4):493-499.
作者姓名:丁睿  刘浩吾  罗凤林  牟廷敏  侯静
作者单位:1. 四川大学,水电学院,成都,610065
2. 四川省交通厅公路规划勘察设计院,成都,610041
3. 美国通用电器塑料中国有限公司,广东,广州,511458
基金项目:交通部“西部交通科技建设项目”
摘    要:基于光时域反射技术,进行了分布式传感光纤检测拱桥钢管混凝土交界面脱空的研究。通过试验确定了光纤在钢管内的布置型式和保护型式,使得光纤能在钢管内准确定位并有效保护,实际工程中存活率达到80%;构建全自动力-光耦合试验系统,进行了交界面脱空传感试验和预应变大比尺钢管混凝土界面脱空仿真试验,建立了力-光耦合本构关系,试验中脱空初始感知开度达到0.1mm,动态范围达到4.8mm,脱空定位达到0.2m。在首次布设光纤传感监测系统的拱桥工程中,检测到大面积脱空,并确定了脱空开度、位置及范围,对于提升大型桥梁工程无损检测水平具有实用意义。

关 键 词:脱空  钢管混凝土拱桥  大型桥梁  工程  交界面  布置型式  试验系统  本构关系  布设  开度
文章编号:1001-4888(2004)04-0493-07
修稿时间:2004年2月20日

An investigation on Optical Fiber Sensing of Interface Disengaging of Steel Tube Confined Concrete in Arch Bridges
DING Rui,LIU Hao-wu,LUO Feng-lin,MU Ting-ming,HOU Jing.An investigation on Optical Fiber Sensing of Interface Disengaging of Steel Tube Confined Concrete in Arch Bridges[J].Journal of Experimental Mechanics,2004,19(4):493-499.
Authors:DING Rui  LIU Hao-wu  LUO Feng-lin  MU Ting-ming  HOU Jing
Institution:DING Rui~,LIU Hao-wu~,LUO Feng-lin~,MU Ting-ming~,HOU Jing~
Abstract:Based on Optical Time Domain Reflectometry, detecting disengaging at interface of steel tube-confined concrete (STCC) with distributed optical fibers was investigated. Through model tests, layout of optical fibers in steel tube and its protecting measures were determined. Therefore precise position and effective protection of fibers can be attained, and in practical application, survival rate of fibers attained 80%. Fully automatic control mechanic-optical coupling test system was designed for model tests, and sensing tests for interface disengaging and prestrained STCC were carried out. The corresponding constitutive relation equation as well as characteristics of the composite fiber was obtained. In the test, initial detecting disengaging value, dynamic range, and positioning accuracy can reach 0.1mm, 4.8mm and 0.2m respectively. The disengaging in large area at interfaces of STCC is successfully detected in application to the arch bridge engineering with the present procedure. Their corresponding disengaging value, position and range are confirmed. This has significant importance to improve nondestructive detection level for large bridge projects.
Keywords:steel tube-confined concrete  microbending  disengaging at interface  sensing optical fiber  coupling  positioning
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