本文選題：橋梁線形　切入點(diǎn)：撓度測(cè)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(kāi)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(shí)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(shí)檢修,輕則影響行車(chē)體驗(yàn)、縮短服役時(shí)間,重則導(dǎo)致橋塌事故、危及生命健康,因此對(duì)橋梁進(jìn)行實(shí)時(shí)健康監(jiān)測(cè)很有必要。橋梁線形是橋梁健康狀況評(píng)價(jià)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(lái)表征。本文在分析眾多撓度測(cè)量方法的基礎(chǔ)上,結(jié)合天津海河大橋健康監(jiān)測(cè)項(xiàng)目的需求,提出了一種橋梁線形監(jiān)測(cè)系統(tǒng)方案,設(shè)計(jì)了一種高精度傾角儀和多類(lèi)型接口數(shù)據(jù)采集終端。該傾角儀借助傾角傳感器對(duì)傾角狀態(tài)進(jìn)行檢測(cè),通過(guò)差分處理濾除影響測(cè)量精度的共模噪聲干擾。此外,采用微處理器對(duì)傾角電壓信號(hào)進(jìn)行過(guò)采樣和溫度補(bǔ)償處理,進(jìn)一步提高測(cè)量精度。同時(shí)對(duì)通信接口電路實(shí)施隔離和抗雷擊設(shè)計(jì),有效抑制高能瞬態(tài)干擾。設(shè)計(jì)的采集終端集成了多種模擬、數(shù)字信號(hào)接口,能實(shí)現(xiàn)監(jiān)測(cè)系統(tǒng)對(duì)橋梁不同類(lèi)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(guò)無(wú)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(píng)估,實(shí)現(xiàn)對(duì)橋梁線形狀態(tài)的實(shí)時(shí)監(jiān)測(cè)。通過(guò)實(shí)際對(duì)比測(cè)試顯示,傾角儀測(cè)量精度達(dá)到0.005°,有效測(cè)量范圍±15°,滿足了橋梁線形測(cè)量的實(shí)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(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：U446;TP212

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