基于BOTDA技术的预应力钢绞线分布式应力监测技术研究  

Research on Prestressed Steel Strand Distributed Stress Monitoring Technology Based on BOTDA

作　　者：丁勇[1,2] 呙于平 杨广忠 杨洋洲 

机构地区：[1]中国一冶有限公司,湖北武汉430081 [2]南京理工大学理学院,江苏南京210094

出　　处：《施工技术》2015年第9期49-51,60,共4页Construction Technology

基　　金：中央高校基本科研业务费专项资金资助(30920130112008);海洋公益性行业科研专项经费项目资助(201005006)

摘　　要：介绍了一种利用分布式光纤传感技术监测预应力混凝土中预应力钢绞线应力、应变状态的新方法。通过在钢绞线表面布设分布式传感光纤,并安装在预应力混凝土的波纹管内,与同一波纹管中的其他钢绞线同时受拉变形,对预应力钢绞线应变进行分布式测量,从而实现预应力混凝土中预应力钢绞线的分布式应力监测。该技术在某高架桥预应力混凝土横梁中成功应用,揭示了预应力钢绞线应力衰减的变化过程。This paper introduces a new method to monitor the stress and strain state of the prestressed steel strand in the prestressed concrete using distributed optical fiber sensing technology. This method arranges the distributed sensing optical fiber on the surface of the steel strand,and installs it into the corrugated tube which is in the prestressed concrete,with the other steel strand in the corrugated tube tensile deformation at the same time. The prestressed steel strand strain is distributed measured,so as to realize the distributed monitoring on the stress of prestressed steel strand in prestressed concrete. The technology has been applied successfully in prestressed concrete beams of a viaduct. Authors reveal the change process of prestressed steel strand stress attenuation.

关 键 词：预应力 桥梁工程 混凝土 钢绞线 传感光纤 

分 类 号：TU757[建筑科学—建筑技术科学]