基于光纤监测的单梁预应力状态评估  

Evaluation of Prestressed State of Single Girder Based on Optical Fiber Monitoring

作　　者：向曼 李红[1] 林庆元 周宝林 XIANG Man;LI Hong;LIN Qing-yuan;ZHOU Bao-lin(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China;Shandong Luqiao Group Co Ltd,Ji'nan 250014,China)

机构地区：[1]武汉理工大学交通与物流工程学院,武汉430063 [2]山东省路桥集团有限公司,济南250014

出　　处：《武汉理工大学学报》2022年第7期75-79,共5页Journal of Wuhan University of Technology

基　　金：山东省路桥集团有限公司科技项目.

摘　　要：以某大桥30m T梁为试验对象,利用Midas对单梁在施加预应力后,T梁内部应力变化情况进行有限元仿真计算。利用光纤Bragg光栅传感器采集单梁施加预应力后的应变数据,并对这些数据进行汇总、处理和分析,得出预应力混凝土梁在张拉后的真实应力分布状态。将仿真分析值与实测单梁预应力分布情况进行对比和分析,并对预应力混凝土结构的预应力状态进行评估。This paper relies on the 30mT beam of a bridge in the project as the test object,and uses the finite element software such as Midas to simulate and analyze the internal stress change of the T beam after prestressing the single beam.The fiber Bragg grating sensor is used to collect the strain data of the single beam after prestressing,and the data is summarized,processed and analyzed to obtain the true stress distribution state of the prestressed concrete beam after tensioning.The simulation analysis value and the measured single beam prestress distribution are compared and analyzed,and the prestressed state of the prestressed concrete structure is evaluated.

关 键 词：光纤应变监测 预应力损失 有限元模型 

分 类 号：TK0[动力工程及工程热物理] U446[建筑科学—桥梁与隧道工程]