本文選題：橋梁線形　切入點：撓度測量　出處：《南京郵電大學(xué)》2016年碩士論文

【摘要】：橋梁的建設(shè)和使用處在開放環(huán)境中,除了橋梁結(jié)構(gòu)自重、材料老化等自身因素外,還時刻遭受著其它自然環(huán)境和人為因素的持續(xù)影響,致使橋梁產(chǎn)生不同程度的損傷和劣化。這些隱患若得不到及時檢修,輕則影響行車體驗、縮短服役時間,重則導(dǎo)致橋塌事故、危及生命健康,因此對橋梁進(jìn)行實時健康監(jiān)測很有必要。橋梁線形是橋梁健康狀況評價的重要指標(biāo),反映了橋梁的整體工作狀況,其變化情況可以由橋梁關(guān)鍵斷面的撓度來表征。本文在分析眾多撓度測量方法的基礎(chǔ)上,結(jié)合天津海河大橋健康監(jiān)測項目的需求,提出了一種橋梁線形監(jiān)測系統(tǒng)方案,設(shè)計了一種高精度傾角儀和多類型接口數(shù)據(jù)采集終端。該傾角儀借助傾角傳感器對傾角狀態(tài)進(jìn)行檢測,通過差分處理濾除影響測量精度的共模噪聲干擾。此外,采用微處理器對傾角電壓信號進(jìn)行過采樣和溫度補償處理,進(jìn)一步提高測量精度。同時對通信接口電路實施隔離和抗雷擊設(shè)計,有效抑制高能瞬態(tài)干擾。設(shè)計的采集終端集成了多種模擬、數(shù)字信號接口,能實現(xiàn)監(jiān)測系統(tǒng)對橋梁不同類型傳感器的數(shù)據(jù)采集,其中GPRS/CDMA模塊能將所有采集的數(shù)據(jù)通過無線網(wǎng)絡(luò)上傳到監(jiān)控中心進(jìn)行數(shù)據(jù)分析和安全評估,實現(xiàn)對橋梁線形狀態(tài)的實時監(jiān)測。通過實際對比測試顯示,傾角儀測量精度達(dá)到0.005°,有效測量范圍±15°,滿足了橋梁線形測量的實際需求。
[Abstract]:The construction and use of bridges in the open environment, in addition to the bridge structure weight, material aging and other factors, but also suffered from other natural and man-made factors. If these hidden dangers are not repaired in time, they will affect the driving experience, shorten the service time, cause bridge collapse accident and endanger life and health. Therefore, it is necessary to carry out real-time health monitoring for bridges. Bridge alignment is an important index for the evaluation of bridge health status, which reflects the overall working status of the bridge. The variation can be represented by the deflection of the key section of the bridge. Based on the analysis of many deflection measurement methods and the needs of the health monitoring project of Tianjin Haihe Bridge, a bridge linear monitoring system scheme is proposed in this paper. A kind of high-precision dipmeter and multi-type interface data acquisition terminal are designed. The obliquity sensor is used to detect the obliquity state, and the common-mode noise interference which affects the measurement accuracy is filtered by differential processing. In addition, The oversampling and temperature compensation of dip voltage signal are carried out by microprocessor to further improve the measuring accuracy. At the same time, the communication interface circuit is isolated and designed to resist lightning strike. The designed acquisition terminal integrates a variety of analog and digital signal interfaces, which can realize the data acquisition of different types of sensors in the bridge by the monitoring system. The GPRS/CDMA module can upload all the collected data to the monitoring center through the wireless network for data analysis and safety evaluation, and realize the real-time monitoring of the bridge linear status. The precision of the dipmeter is 0.005 擄and the effective measuring range is 鹵15 擄, which meets the practical requirement of the bridge alignment measurement.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U446;TP212

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