本文選題：橋梁施工監(jiān)測 + 應(yīng)變測試　； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：我國的大跨徑橋梁建設(shè)在近30余年來取得了巨大成就，其中橋梁施工監(jiān)測起到了重要的技術(shù)支撐作用。總結(jié)工程經(jīng)驗可以發(fā)現(xiàn)，廣泛使用的基于振弦式應(yīng)變傳感器的施工應(yīng)變監(jiān)測（應(yīng)力監(jiān)測）數(shù)據(jù)存在較大偏差，橋梁施工監(jiān)測中的應(yīng)變測試技術(shù)需要進(jìn)一步開展研究。 本文在《公路橋梁施工監(jiān)控技術(shù)規(guī)范》項目的資助下，依托主跨200米的桐梓河大橋的施工監(jiān)控，針對兩個箱梁截面，布置8個應(yīng)變測點(diǎn)（1個測點(diǎn)失效后，，只有7個有效測點(diǎn)），同時采用振弦式應(yīng)變傳感器與光纖光柵式應(yīng)變傳感器，進(jìn)行了實橋同條件下的施工過程應(yīng)變監(jiān)測。通過對應(yīng)變監(jiān)測數(shù)據(jù)的整理和分析，得到以下主要結(jié)論： ①試驗共獲得7個測點(diǎn)14條應(yīng)力測試曲線，在進(jìn)行應(yīng)變漂移處理之前，測試結(jié)果顯示應(yīng)力測試曲線的走向與變化趨勢與理論曲線一致，但偏差較大，箱梁頂板測點(diǎn)偏差分布在0~60%范圍內(nèi)，底板偏差更大。14條應(yīng)力測試曲線中只有1條光纖光柵傳感器測試曲線與理論值吻合較好。 ②經(jīng)過應(yīng)變漂移的處理，頂板三個光纖光柵傳感器所測數(shù)據(jù)的偏差較多分布于10%~20%，部分測試值偏差大于30%；頂板三個振弦傳感器所測數(shù)據(jù)的偏差主要分布在10%以內(nèi)，偏差超過20%的測試值僅有1個。兩種傳感器中振弦傳感器測試值絕對偏差分布范圍與均值稍小。底板四個光纖光柵傳感器所測數(shù)據(jù)與四個振弦傳感器測試值的偏差均較大。 ③兩種傳感器的應(yīng)變測試數(shù)據(jù)分析表明，振弦傳感器與光纖光柵傳感器在本橋施工監(jiān)測的應(yīng)變測試中，測試偏差總體上相當(dāng)。
[Abstract]:The construction of long span bridges in China has made great achievements in the past 30 years, among which bridge construction monitoring plays an important role in technical support. Summing up engineering experience, it can be found that the widely used construction strain monitoring (stress monitoring) data based on vibrating string strain sensor have a large deviation, and the strain testing technology in bridge construction monitoring needs further research. In this paper, with the support of "Technical Specification for Highway and Bridge Construction Monitoring", and relying on the construction monitoring of Tongzi River Bridge with a main span of 200 meters, eight strain measuring points are arranged for two box girder sections. At the same time, the strain monitoring of the construction process under the same condition is carried out by using vibrating string strain sensor and fiber Bragg grating strain sensor. Based on the analysis of strain monitoring data, the main conclusions are as follows: 1. A total of 14 stress test curves were obtained from 7 measuring points. The test results show that the trend and trend of stress measurement curve are consistent with the theoretical curve, but the deviation is large, and the deviation of measuring point of box girder roof is in the range of 0 ~ 60%. There is only one fiber Bragg grating sensor test curve which is in good agreement with the theoretical value out of 14 stress test curves with a larger deviation of the bottom plate. 2 after the treatment of strain drift, The deviation of data measured by three fiber Bragg grating sensors is more than 10%, and the deviation of some of the measured values is more than 30%, while the deviation of the data measured by the three top vibrating string sensors is mainly within 10%, and only one of the measured values is more than 20%. The distribution range of absolute deviation of the measured values of vibrating string sensors is slightly smaller than that of the average values in the two kinds of sensors. The deviation between the measured data of four fiber Bragg grating sensors on the base plate and the measured values of the four vibrating string sensors is large. 3 the analysis of the strain test data of the two kinds of sensors shows that, In the strain test of the bridge construction monitoring, the testing deviation of vibrating string sensor and fiber grating sensor is the same as that of fiber grating sensor on the whole.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U446

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