本文選題：連續(xù)梁橋 + 變形監(jiān)測��； 參考：《河南工業(yè)大學》2014年碩士論文

【摘要】：在古今中外的重大交通基礎(chǔ)設施建設過程中，橋梁工程一直是控制性工程之一，是交通運輸工程的咽喉所在，在人類社會的發(fā)展進程中起著不可替代的作用。近十幾年來，隨著社會的發(fā)展以及科學技術(shù)的進步，公路交通量的增長突飛猛進，大型重載的運輸工具得到越來越多的使用，使得人們對橋梁的要求也越來越高。懸臂施工方法的出現(xiàn)，使預應力混凝土連續(xù)梁橋在整個橋梁工程領(lǐng)域空前的活躍起來。連續(xù)梁橋采用懸臂施工方法時，需要經(jīng)過對稱的單T靜定結(jié)構(gòu)，然后進行體系轉(zhuǎn)換，轉(zhuǎn)變?yōu)槌o定結(jié)構(gòu)，施工過程非常復雜，因此，在施工過程中需要通過模擬以及監(jiān)測的的手段來確定橋梁結(jié)構(gòu)在每個施工階段的受力和變形情況，總結(jié)橋梁的變形規(guī)律，防止各種不利情況的出現(xiàn)，最終保證橋梁施工和運營過程的安全。 本文依托鄭州市貫通東西的重要通道——南四環(huán)道路工程(G107輔道十八里河段)當中的南水北調(diào)大橋，對預應力混凝土連續(xù)梁橋的發(fā)展歷史及特點進行了概述，簡要介紹了該橋梁的工程概況以及材料特性等，，并借助MIDAS/CIVIL軟件介紹了建立了合適的橋梁分析模型具體過程，結(jié)合最小二乘法的參數(shù)估計方法，對一些參數(shù)進行了調(diào)整，最終得出了橋梁在位移以及內(nèi)力方面的一些模擬計算結(jié)果，結(jié)合實測數(shù)據(jù)成果，進行對比分析，總結(jié)了橋梁變形的影響因素，發(fā)現(xiàn)： 1采用數(shù)值分析方法及其專業(yè)軟件對橋梁進行施工監(jiān)控，結(jié)合施工現(xiàn)場實測數(shù)據(jù)與參數(shù)，實時調(diào)整結(jié)構(gòu)模型參數(shù)，可以使成橋線形與設計線形較好的吻合，從而保證施工質(zhì)量滿足相關(guān)規(guī)范要求，確保整個施工過程的安全。 2橋梁施工監(jiān)測過程中獲取有效且可靠的監(jiān)測數(shù)據(jù)是至關(guān)重要的，因此應該采取有效的監(jiān)測工具，比如光纖傳感器等來獲取可靠的監(jiān)測數(shù)據(jù)。光纖傳感器具有結(jié)構(gòu)簡單、重量輕、體積小、耐久性和耐腐蝕性較好等特點，其測量精度高，獲取的監(jiān)測數(shù)據(jù)穩(wěn)定可靠，受外界因素影響較小，抗干擾性強。 3橋梁懸臂施工監(jiān)控的一個關(guān)鍵環(huán)節(jié)是懸臂施工立模標高及結(jié)構(gòu)線形控制。在實際施工過程中，必須采用專業(yè)的軟件對其進行數(shù)值模擬，并且結(jié)合現(xiàn)場監(jiān)測數(shù)據(jù)，應用合適的誤差處理方法，不斷的給出立模標高預測，最終使橋梁的實際成橋線形接近設計線形。 4自重、溫度、鋼束預應力、支座沉降、混凝土收縮徐變以及汽車活荷載等都會引起橋梁產(chǎn)生變形，在實際工程施工過程中應予以考慮，并采取的相應的措施，確保橋梁的質(zhì)量。 以上基本結(jié)論可以為以后同類橋梁的設計和施工提供有益的參考，對橋梁科研和發(fā)展奠定基礎(chǔ)。
[Abstract]:In the process of major transportation infrastructure construction, bridge engineering has always been one of the controlling projects and the throat of transportation engineering, which plays an irreplaceable role in the development of human society. In the past ten years, with the development of society and the progress of science and technology, the traffic volume of highway has increased by leaps and bounds, and the large and heavy-haul transportation tools have been used more and more, which makes people's demand for bridges more and more high. With the emergence of cantilever construction method, prestressed concrete continuous beam bridge is becoming more and more active in the whole bridge engineering field. When the cantilever construction method is used in the continuous beam bridge, it is necessary to go through the symmetrical single T statically indeterminate structure, and then transform the system into the statically indeterminate structure. The construction process is very complicated, so, In the construction process, it is necessary to determine the stress and deformation of the bridge structure in each construction stage by means of simulation and monitoring, summarize the deformation law of the bridge, and prevent the occurrence of various adverse situations. Finally ensure the safety of bridge construction and operation process. Based on the South-to-North Water transfer Bridge in the South fourth Ring Road Project (G107 Fu Road, 18 li reach), the development history and characteristics of the prestressed concrete continuous beam bridge are summarized. This paper briefly introduces the engineering situation and material characteristics of the bridge, and introduces the concrete process of establishing a suitable bridge analysis model by means of Midas / CIVIL software, and adjusts some parameters in combination with the method of parameter estimation by the least square method. Finally, some simulation results of the displacement and internal force of the bridge are obtained, and the influence factors of the bridge deformation are summarized by comparing and analyzing the measured data. The results are as follows: (1) by using numerical analysis method and its professional software to monitor the construction of the bridge, combining with the measured data and parameters of the construction site, and adjusting the parameters of the structural model in real time, the alignment of the completed bridge and the design line can be well matched. In order to ensure that the construction quality meets the requirements of relevant codes and ensure the safety of the whole construction process. 2 it is very important to obtain effective and reliable monitoring data in the process of bridge construction monitoring. Therefore, effective monitoring tools should be adopted. Such as optical fiber sensors to obtain reliable monitoring data. The optical fiber sensor has the characteristics of simple structure, light weight, small volume, durability and corrosion resistance, etc. It has high measuring precision, stable and reliable monitoring data, and is less affected by external factors. A key link of bridge cantilever construction monitoring is the elevation of vertical formwork and the control of structure alignment in cantilever construction. In the actual construction process, we must use the professional software to carry on the numerical simulation to it, and combine the field monitoring data, apply the suitable error processing method, give the vertical mold elevation forecast unceasingly. Finally, the actual bridge shape of the bridge is close to that of the design line. 4 the weight, temperature, prestress, bearing settlement, shrinkage and creep of concrete and vehicle live load will cause the deformation of the bridge. The quality of the bridge should be ensured by the corresponding measures taken in the course of actual engineering construction. The above conclusions can provide a useful reference for the design and construction of similar bridges in the future and lay a foundation for bridge research and development.
【學位授予單位】：河南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U446;U445.4

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