摘要
以单模光纤测量AFRP索的应变为例,对BOTDR分布式光纤传感技术用于检测桥梁体外FRP拉索应力(应变)的可行性进行了试验研究。单根索的循环张拉试验表明,50次循环后BOTDR所得应变与位移计所得应变的相关系数仍达0.998。体外预应力T形截面桥梁模型受弯试验中,BOTDR对体外四折线形预应力AFRP拉索应变的测量结果与应变计测量结果的相对误差基本在5%以内。研究表明,紧套单模光纤柔软纤细,粘贴工艺简单,能准确地测得被测索的应变。
Based on measuring of the strain of AFRP tendons using optic fiber, the experimental study on measuring the stress of external FRP tendons of bridges using distributed optic fiber is proceeded. The result of circular tension experiment indicates that the correlation coefficient of strains obtained by BOTDR and by displacement gauges could still reach 0.998. On the bending experiment of a T-section bridge model with external prestressed tendons, the strain difference of four segments of one AFRP tendon obtained by BOTDR and by strain gauges is mostly less than 5%. Studies indicate that because single mode optic fiber is soft and thin and easy to be stuck, the strain of tendons can be measured accurately.
出处
《公路交通科技》
CAS
CSCD
北大核心
2006年第10期75-78,82,共5页
Journal of Highway and Transportation Research and Development
基金
国家863计划项目(2001AA336010)
