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工程力学  2015 

基于PPP-BOTDA技术的PBL剪力键群应变测试研究

DOI: 10.6052/j.issn.1000-4750.2013.07.0682, PP. 111-119

Keywords: 混合结构,PBL剪力键,PPP-BOTDA,分布式光纤传感器,应变测试,应变传递

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Abstract:

为研究混合结构PBL剪力键群各剪力键的剪力传递,在开孔板界面摩擦效应测试中引入了光纤传感测试技术。阐述了PPP-BOTDA(Pulse-PrePumpBrillouinOpticalTimeDomainAnalysis)技术的测量原理,根据多中间层的剪滞理论,建立了基体-光纤间的应变传递模型,推导了表贴式光纤的应变传递公式,基于4个四排PBL剪力键群试件的静载破坏试验,实现了对PBL剪力键开孔钢板及混凝土应变的空间分布式测量,并对分布式传感光纤的应变传递进行了敏感性分析。测试结果及分析表明:在仪器的空间分辨率一定时,传感光纤的粘贴宽度、光纤护套的厚度对应变传递影响显著,粘结层胶体的剪切模量对应变传递影响不甚明显;对比剪力键试验中应变片与分布式光纤的应变数据,试验采用的两种光纤均具有良好的应变测量精度,试验结果与理论敏感性分析较为一致;基于PPP-BOTDA的分布式光纤测试方法,克服了传统应变片测试中的不足,在既定的光纤铺设工艺下,适用于结构的大应变、高精度、分布式测量。

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