混凝土水化热对钢筋应力影响的FBG监测研究  

Monitoring of Concrete Hydration Heat Effect on Rebar Stress Based on FBG Sensors

作　　者：方海东[1,2] 宋占璞 施斌[1] 

机构地区：[1]南京大学地球科学与工程学院,江苏南京210046 [2]江苏省交通规划设计院股份有限公司,江苏南京210005

出　　处：《防灾减灾工程学报》2016年第3期499-504,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家"十二五"科技支撑计划课题项目(2012BAK10B05);国家自然科学基金重点项目(41230636)资助

摘　　要：以江苏省海安船闸项目为工程背景,运用布拉格光纤光栅(FBG)应变感测技术,对船闸闸首底板钢筋结构在施工过程中的应力状态进行了监测;运用布拉格光纤光栅温度感测技术对船闸闸首底板结构的温度变化进行监测,并由此对钢筋应变监测结果进行了温度补偿,分析了闸首底板钢筋应力的变化规律。结果表明:船闸闸首底板钢筋混凝土结构中钢筋应变过程与混凝土水化热温度释放规律正相关,其应力状态主要受混凝土水化热释放引起的温度应力影响,钢筋轴向呈拉应变分布。该研究成果验证了基于FBG光栅传感技术在船闸等大型水工结构施工监测中的可行性,并对光纤传感技术的应用研发和大型船闸水工结构的设计参考及施工工艺的改进具有重要意义。In this paper, a measurement is carried out for the construction of ship rock structure by using Fiber Bragg Grating （ FBG ）. The rebar strain changes of lock head structure of the ship lock during construction are also measured by FBG. Combining with the monitoring data, the stress/strain status changes in the interior of the lock head floor are comprehensively analyzed under the double actions of concrete hydration heat release and upper loading. The feasibility is validated for health monitoring on large hydraulic structure such as ship lock by using the optical fiber sensing technology. The research results are of great significance for design, construction and maintenance of the large hydraulic structure, and show the wide applications of the optical fi- ber sensing technologies in infrastructural engineering health monitoring.

关 键 词：钢筋应力 混凝土水化热 FBG感测技术 钢筋混凝土结构 施工监测 

分 类 号：TV5[水利工程—水利水电工程]