本文關(guān)鍵詞：基于分布式光纖傳感的混凝土裂縫識(shí)別與監(jiān)測(cè)試驗(yàn)研究　出處：《傳感技術(shù)學(xué)報(bào)》2014年09期 　論文類(lèi)型：期刊論文

  更多相關(guān)文章： 混凝土結(jié)構(gòu) 裂縫監(jiān)測(cè) 裂縫擴(kuò)展 光纖傳感 BOTDA

【摘要】：鋼筋混凝土結(jié)構(gòu)的裂縫寬度超過(guò)規(guī)范限值后會(huì)引起滲水、鋼筋銹蝕等問(wèn)題,破壞混凝土結(jié)構(gòu)的整體性和安全性。結(jié)構(gòu)裂縫監(jiān)測(cè)是評(píng)估結(jié)構(gòu)安全性的重要依據(jù)之一,分布式光纖裂縫監(jiān)測(cè)技術(shù)(BOTDA/R)可有效避免點(diǎn)式檢測(cè)空間不連續(xù)造成的漏檢現(xiàn)象。本文根據(jù)鋼筋混凝土結(jié)構(gòu)裂縫形成機(jī)理和前期研究提出的斜交光纖組裂縫監(jiān)測(cè)方法,對(duì)混凝土裂縫光纖監(jiān)測(cè)進(jìn)行了參數(shù)敏感性分析。分析結(jié)果表明采用斜交光纖組可跟蹤監(jiān)測(cè)寬度大于0.04mm以上的裂縫發(fā)生及開(kāi)展過(guò)程。依據(jù)分析結(jié)果,本文改進(jìn)了光纖布設(shè)方式監(jiān)測(cè)混凝土微裂縫,實(shí)現(xiàn)了微裂縫的發(fā)生及開(kāi)裂路徑的監(jiān)測(cè)。本文通過(guò)鋼筋混凝土梁的靜載試驗(yàn),分別驗(yàn)證了梁側(cè)全面粘結(jié)光纖的微裂縫識(shí)別和梁底斜交光纖組的裂縫寬度跟蹤監(jiān)測(cè)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.
【作者單位】： 浙江大學(xué)寧波理工學(xué)院;浙江大學(xué)結(jié)構(gòu)工程研究所;浙江舟山跨海大橋有限公司;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51408544,51208459) 浙江省自然科學(xué)基金項(xiàng)目(LQ14E080007) 寧波市自然科學(xué)基金項(xiàng)目(2013A610191) 寧波市科技創(chuàng)新團(tuán)隊(duì)項(xiàng)目(2011B81005)
【分類(lèi)號(hào)】：TU375
【正文快照】： 土木工程領(lǐng)域的大多數(shù)鋼筋混凝土結(jié)構(gòu)是帶裂縫工作,世界各國(guó)對(duì)混凝土都有一個(gè)允許裂縫寬度的限值,我國(guó)混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范規(guī)定,依據(jù)不同的環(huán)境類(lèi)別設(shè)置的允許裂縫寬度范圍為0.2 mm~0.4 mm[1]。裂縫超過(guò)允許裂縫寬度后會(huì)引起滲水、鋼筋銹蝕等問(wèn)題,破壞混凝土結(jié)構(gòu)的整體性和安全

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本文編號(hào)：1428317