【摘要】：為解決傳統(tǒng)橋梁位移監(jiān)測方法傳感器數(shù)量有限、監(jiān)測信息不全面以及監(jiān)測成本高等問題,以京滬高鐵南京大勝關(guān)大橋為對象,研究了基于合成孔徑雷達干涉(In SAR)的大跨橋梁結(jié)構(gòu)縱向位移監(jiān)測方法.利用歐空局Sentinel-1A衛(wèi)星IW模式影像,建立了適用于大跨橋梁縱向位移監(jiān)測的In SAR時間序列分析方法,得到了全橋1 723個相干目標的縱向位移信息.分析結(jié)果表明,大橋縱向位移主要由熱膨脹引起,采用In SAR技術(shù)可以準確識別全橋縱向位移,且支座處縱向位移與結(jié)構(gòu)溫度的相關(guān)性模型與該橋支座位移傳感器建模結(jié)果吻合.
[Abstract]:In order to solve the problems of limited number of sensors, incomplete monitoring information and high monitoring cost of traditional bridge displacement monitoring methods, the longitudinal displacement monitoring method of long-span bridge structures based on synthetic aperture radar interferometric (In SAR) is studied, taking Nanjing Dasheng Gate Bridge of Beijing-Shanghai High Speed Railway as the object. Based on the IW mode image of Sentinel-1A satellite, a In SAR time series analysis method for longitudinal displacement monitoring of long-span bridges is established, and the longitudinal displacement information of 1723 coherent targets of the whole bridge is obtained. The analysis results show that the longitudinal displacement of the bridge is mainly caused by thermal expansion. In SAR technique can be used to accurately identify the longitudinal displacement of the whole bridge, and the correlation model between longitudinal displacement and structural temperature at the support is in good agreement with the modeling results of the displacement sensor of the bridge support.
【作者單位】： 河海大學地球科學與工程學院;東南大學混凝土及預(yù)應(yīng)力混凝土結(jié)構(gòu)教育部重點實驗室;
【基金】：國家重點基礎(chǔ)研究計劃(973計劃)資助項目(2015CB060000) 國家自然科學基金資助項目(41304025,51578138,51608258) 江蘇省自然科學基金資助項目(BK20130831)
【分類號】：U446
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本文編號：2509278