基于分布式光纤传感的混凝土裂缝识别与监测试验研究

发布时间：2018-01-15 12:15

本文关键词：基于分布式光纤传感的混凝土裂缝识别与监测试验研究　出处：《传感技术学报》2014年09期 　论文类型：期刊论文

【摘要】：钢筋混凝土结构的裂缝宽度超过规范限值后会引起渗水、钢筋锈蚀等问题,破坏混凝土结构的整体性和安全性。结构裂缝监测是评估结构安全性的重要依据之一,分布式光纤裂缝监测技术(BOTDA/R)可有效避免点式检测空间不连续造成的漏检现象。本文根据钢筋混凝土结构裂缝形成机理和前期研究提出的斜交光纤组裂缝监测方法,对混凝土裂缝光纤监测进行了参数敏感性分析。分析结果表明采用斜交光纤组可跟踪监测宽度大于0.04mm以上的裂缝发生及开展过程。依据分析结果,本文改进了光纤布设方式监测混凝土微裂缝,实现了微裂缝的发生及开裂路径的监测。本文通过钢筋混凝土梁的静载试验,分别验证了梁侧全面粘结光纤的微裂缝识别和梁底斜交光纤组的裂缝宽度跟踪监测的有效性。
[Abstract]:When the crack width of reinforced concrete structure exceeds the limit of code, it will cause water seepage and corrosion of steel bar and so on. Damage to the integrity and safety of concrete structures. Structural crack monitoring is one of the important basis for evaluating structural safety. Distributed Optical Fiber crack Monitoring technique BOTDA / R). It can effectively avoid the phenomenon of leakage caused by the discontinuity of point detection space. According to the crack formation mechanism of reinforced concrete structure and the previous research, this paper puts forward the method of diagonal fiber group crack monitoring. The parameter sensitivity analysis of fiber optic monitoring of concrete cracks is carried out. The results show that the diagonal fiber group can track the occurrence and development process of cracks whose width is more than 0.04mm. In this paper, the optical fiber placement method is improved to monitor the micro-cracks of concrete, and the occurrence of micro-cracks and the monitoring of crack paths are realized. The static load test of reinforced concrete beams is carried out in this paper. The effectiveness of micro-crack identification and crack width tracking monitoring of beam-side fully bonded fiber group and beam-bottom skew fiber group are verified respectively.
【作者单位】：浙江大学宁波理工学院;浙江大学结构工程研究所;浙江舟山跨海大桥有限公司;
【基金】：国家自然科学基金项目(51408544,51208459) 浙江省自然科学基金项目(LQ14E080007) 宁波市自然科学基金项目(2013A610191) 宁波市科技创新团队项目(2011B81005)
【分类号】：TU375
【正文快照】： 土木工程领域的大多数钢筋混凝土结构是带裂缝工作,世界各国对混凝土都有一个允许裂缝宽度的限值,我国混凝土结构设计规范规定,依据不同的环境类别设置的允许裂缝宽度范围为0.2 mm~0.4 mm[1]。裂缝超过允许裂缝宽度后会引起渗水、钢筋锈蚀等问题,破坏混凝土结构的整体性和安全

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