【摘要】：分布式光纖傳感技術(shù)以其巨大的優(yōu)勢(shì)已經(jīng)被研究者應(yīng)用于諸多的重要結(jié)構(gòu)監(jiān)測(cè)中,而在預(yù)應(yīng)力混凝土橋墩橫梁水化熱和預(yù)應(yīng)力安全監(jiān)測(cè)中尚屬首次,如何在結(jié)構(gòu)中布設(shè)光纖、如何提高光纖的存活率以及針對(duì)體內(nèi)預(yù)應(yīng)力鋼絞線的分布式監(jiān)測(cè)技術(shù)尚有許多的問(wèn)題并沒(méi)有得到解決,據(jù)此本文進(jìn)行了如下內(nèi)容的研究和探索：1、分析比較了傳統(tǒng)監(jiān)測(cè)方法的優(yōu)缺點(diǎn)和分布式光纖技術(shù)應(yīng)用于預(yù)應(yīng)力混凝土橋墩橫梁水化熱和預(yù)應(yīng)力監(jiān)測(cè)的理論可行性和優(yōu)勢(shì)；2、從理論上分析了大體積混凝土溫度場(chǎng)的變化機(jī)理和預(yù)應(yīng)力鋼絞線的應(yīng)力衰減影響因素,為大體積混凝土水化熱三維溫度場(chǎng)的建立和預(yù)應(yīng)力鋼絞線的模擬提供了理論支持。3、通過(guò)現(xiàn)場(chǎng)實(shí)驗(yàn),建立了一整套基于BOTDA技術(shù)的預(yù)應(yīng)力混凝土水化熱和預(yù)應(yīng)力分布式監(jiān)測(cè)系統(tǒng)；建立了預(yù)應(yīng)力混凝土橫梁的可視化三維溫度場(chǎng)。4、結(jié)合實(shí)驗(yàn)現(xiàn)場(chǎng)的光纖布設(shè)經(jīng)驗(yàn),有效的解決了應(yīng)變光纖監(jiān)測(cè)體內(nèi)預(yù)應(yīng)力鋼絞線光纖兩頭引出預(yù)應(yīng)力結(jié)構(gòu)困難的問(wèn)題。5、利用有限軟件建立了預(yù)應(yīng)力混凝土橋墩橫梁結(jié)構(gòu)模擬加載的現(xiàn)場(chǎng)情況,分析了不同張拉應(yīng)力條件下,預(yù)應(yīng)力鋼絞線應(yīng)力的影響范圍和大小�；谝陨涎芯抗ぷ�,取得了如下成果：1、首次實(shí)現(xiàn)了基于BOTDA技術(shù)的預(yù)應(yīng)力混凝土橫梁水化熱監(jiān)測(cè),揭示了預(yù)應(yīng)力混凝土橫梁水化熱三維溫度場(chǎng)的變化規(guī)律；2、首次實(shí)現(xiàn)了預(yù)應(yīng)力鋼絞線的分布式應(yīng)變監(jiān)測(cè),揭示了施工過(guò)程中多級(jí)荷載作用下鋼絞線的應(yīng)力變化過(guò)程；3、將傳感光纖布設(shè)在預(yù)應(yīng)力鋼絞線表面,分布式監(jiān)測(cè)體內(nèi)預(yù)應(yīng)力鋼絞線的應(yīng)力衰減過(guò)程,為預(yù)應(yīng)力結(jié)構(gòu),特別是體內(nèi)預(yù)應(yīng)力鋼絞線結(jié)構(gòu)提供了一種新的監(jiān)測(cè)手段；4、預(yù)應(yīng)力鋼絞線在張拉完成后是有一個(gè)明顯的應(yīng)力衰減過(guò)程的,這個(gè)過(guò)程所需的時(shí)間可能很長(zhǎng),但在張拉完成后一個(gè)月內(nèi)衰減量可以達(dá)到衰減總量的75%以上。
[Abstract]:Distributed optical fiber sensing technology has been applied to many important structural monitoring for its tremendous advantages, but it is the first time in the monitoring of hydration heat and prestressing safety of prestressed concrete pier beam. How to lay optical fiber in the structure, how to improve the survival rate of optical fiber and how to distribute prestressed strands in the body are also discussed. There are still many problems that have not been solved in this paper. The following contents are studied and explored in this paper: 1. The advantages and disadvantages of traditional monitoring methods and the theoretical feasibility and advantages of applying distributed optical fiber technology to the monitoring of hydration heat and prestress of prestressed concrete pier beam are analyzed and compared. The variation mechanism of temperature field of mass concrete and the influence factors of stress attenuation of prestressed strand provide theoretical support for the establishment of three-dimensional temperature field of hydration heat of mass concrete and the simulation of prestressed strand. Distributed monitoring system; Visualized three-dimensional temperature field of prestressed concrete crossbeam was established. 4. Combining with the experience of fiber arrangement in the experimental site, the difficulty of prestressing structure at both ends of prestressed steel strand fiber in strain optical fiber monitoring system was effectively solved. 5. The crossbeam junction of prestressed concrete pier was established by using finite software. Based on the above research work, the following achievements have been achieved: 1. Hydration heat monitoring of prestressed concrete beams based on BOTDA technology is realized for the first time, and the three-dimensional temperature of hydration heat of prestressed concrete beams is revealed. 2. Distributed strain monitoring of prestressed strand is realized for the first time, and the stress variation process of strand under multi-stage load is revealed. 3. The sensing fiber is laid on the surface of prestressed strand, and the stress attenuation process of prestressed strand is monitored in a distributed way, which is a prestressed structure, especially the prestressed structure. Prestressed strand structure in vivo provides a new monitoring method; 4. Prestressed strand has an obvious stress attenuation process after tensioning, which may take a long time, but the attenuation can reach more than 75% of the total attenuation within one month after tensioning.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U447

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