青藏高原連續(xù)剛構(gòu)橋施工控制及溫度效應(yīng)研究
發(fā)布時(shí)間：2018-08-01 11:23
【摘要】：隨著預(yù)應(yīng)力技術(shù)的改進(jìn)和橋梁施工技術(shù)的長(zhǎng)足發(fā)展,橋梁的跨度不斷增大,結(jié)構(gòu)形式也日趨復(fù)雜，為了使得橋梁的線形、應(yīng)力滿足要求，橋梁施工過程的安全,大跨度橋梁的施工控制技術(shù)便應(yīng)運(yùn)而生,同時(shí)也伴隨著對(duì)計(jì)算理論、混凝土收縮徐變、溫度等因素對(duì)結(jié)構(gòu)影響研究不斷深化，橋梁建設(shè)時(shí)的控制精確度也越來(lái)越高。隨著橋梁建設(shè)事業(yè)中連續(xù)梁橋廣泛的應(yīng)用，預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)梁橋已經(jīng)成為目前采用基礎(chǔ)的橋梁結(jié)構(gòu)，在施工過程中的施工控制的重要性就顯得日益突出。本文以雅魯藏布江三號(hào)特大橋?yàn)楣こ瘫尘�，采用Midas-Civil結(jié)構(gòu)計(jì)算分析軟件對(duì)該橋的施工過程進(jìn)行模擬，計(jì)算得出本橋在各個(gè)施工階段的撓度和內(nèi)力，為大橋的監(jiān)控提供理論數(shù)據(jù)，在施工的過程當(dāng)中嚴(yán)格按照已經(jīng)制定的監(jiān)控方案，同時(shí)對(duì)施工各個(gè)階段結(jié)構(gòu)的受力、線形等數(shù)據(jù)進(jìn)行實(shí)際量測(cè)，再通過實(shí)測(cè)值與理論值的對(duì)比、分析、尋找原因等，，對(duì)誤差進(jìn)行識(shí)別、預(yù)測(cè)以及最后的調(diào)整，并隨著施工進(jìn)度循環(huán)的過程，使橋梁結(jié)構(gòu)的在施工過程中的實(shí)際狀態(tài)最大程度的接近理論計(jì)算狀態(tài)，不斷循環(huán)上述步驟，最終確保大橋順利合攏，并保證在施工過程中應(yīng)力在控制范圍內(nèi)。 雖然大跨度預(yù)應(yīng)力混凝土箱梁橋由于其所具有的頗多優(yōu)點(diǎn)而應(yīng)用廣泛,但是隨之也無(wú)法避免的出現(xiàn)了箱梁梁體開裂的問題，由于溫度對(duì)橋梁的應(yīng)力影響較大，特別是在西藏地區(qū)的溫度變化快，溫度較低的條件下，有必要對(duì)橋梁的抗裂能力是否滿足當(dāng)?shù)貧夂驐l件進(jìn)行分析預(yù)測(cè)。同時(shí)在冬季施工時(shí)，箱體內(nèi)外養(yǎng)護(hù)溫度差較大，在這種狀態(tài)下便會(huì)產(chǎn)生拉應(yīng)力，因此必須合理的控制箱體內(nèi)外溫度差以及拉應(yīng)力值，以保證混凝土在預(yù)應(yīng)力張拉之前的養(yǎng)護(hù)期間不開裂。本文分析溫度變化對(duì)大跨度連續(xù)橋梁應(yīng)力的影響，以拉日鐵路雅魯藏布江三號(hào)特大橋?yàn)槔M(jìn)行分析，采用Midas-Civil計(jì)算軟件，計(jì)算箱型截面的大跨度橋梁成橋后，在日照作用下梁體的最大應(yīng)力，分析最有可能產(chǎn)生裂縫的位置，進(jìn)而提前采取必要的措施，采用Midas-FEA計(jì)算軟件，分析在冬季施工養(yǎng)護(hù)期間,相對(duì)封閉箱型截面，在箱體內(nèi)溫度和高于外側(cè)溫度的實(shí)際狀態(tài)下，分析單個(gè)澆筑塊體的應(yīng)力值，為冬季施工時(shí)養(yǎng)護(hù)溫度的設(shè)定提供必要的參考依據(jù)。
[Abstract]:With the improvement of prestressed technology and the rapid development of bridge construction technology, the span of the bridge is increasing and the structure form is becoming more and more complicated. In order to make the bridge linear and stress meet the requirements, the construction process of the bridge is safe. The construction control technology of long-span bridge emerges as the times require. At the same time, the research on the influence of calculation theory, concrete shrinkage and creep, temperature and other factors on the structure is deepening, and the control accuracy of bridge construction is becoming higher and higher. With the wide application of continuous beam bridge in bridge construction, prestressed concrete continuous rigid frame beam bridge has become the bridge structure with foundation at present, and the importance of construction control in the construction process is becoming more and more prominent. In this paper, the construction process of the bridge is simulated by using Midas-Civil structure calculation and analysis software, and the deflection and internal force of the bridge in each construction stage are calculated, which provides theoretical data for the monitoring of the bridge, and takes the Yalu Zangbo River Bridge as the engineering background, and uses the software of Midas-Civil structure calculation and analysis to simulate the construction process of the bridge. In the course of construction, strictly according to the monitoring scheme that has been formulated, at the same time, the actual measurement of the structure force, line shape and other data in each stage of construction is carried out, and then through the comparison between the measured value and the theoretical value, the analysis is made to find out the reasons, etc. Identification, prediction and final adjustment of the errors, and with the progress of the construction cycle, the actual state of the bridge structure in the construction process is as close as possible to the theoretical calculation state, and the above steps are repeated. Finally, the bridge is closed smoothly and the stress is controlled during construction. Although the long-span prestressed concrete box girder bridge is widely used because of its many advantages, it is inevitable that the box girder body cracks, because the temperature has a great influence on the stress of the bridge. Especially under the conditions of rapid temperature change and low temperature in Tibet, it is necessary to analyze and predict whether the anti-cracking ability of the bridge meets the local climatic conditions. At the same time, during winter construction, the temperature difference between inside and outside of the box is large, and in this condition the tensile stress will be produced, so it is necessary to control the temperature difference and the tensile stress value of the inside and outside of the box reasonably. This ensures that the concrete does not crack during the curing period prior to the prestress tension. In this paper, the influence of temperature change on the stress of long-span continuous bridge is analyzed. Taking the Yalu Zangbo River No. 3 super bridge of the La-Ji railway as an example, the box section long-span bridge is calculated by using Midas-Civil software. Under the action of sunshine, the maximum stress of beam body is analyzed, the position where cracks are most likely to occur is analyzed, and the necessary measures are taken in advance, and the Midas-FEA calculation software is used to analyze the relative closed box section during the construction and maintenance period in winter. Under the actual condition of the temperature inside the box and the temperature higher than the outside, the stress value of a single pouring block is analyzed, which provides a necessary reference for the setting of maintenance temperature in winter construction.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.4;U448.23
本文編號(hào)：2157422
[Abstract]:With the improvement of prestressed technology and the rapid development of bridge construction technology, the span of the bridge is increasing and the structure form is becoming more and more complicated. In order to make the bridge linear and stress meet the requirements, the construction process of the bridge is safe. The construction control technology of long-span bridge emerges as the times require. At the same time, the research on the influence of calculation theory, concrete shrinkage and creep, temperature and other factors on the structure is deepening, and the control accuracy of bridge construction is becoming higher and higher. With the wide application of continuous beam bridge in bridge construction, prestressed concrete continuous rigid frame beam bridge has become the bridge structure with foundation at present, and the importance of construction control in the construction process is becoming more and more prominent. In this paper, the construction process of the bridge is simulated by using Midas-Civil structure calculation and analysis software, and the deflection and internal force of the bridge in each construction stage are calculated, which provides theoretical data for the monitoring of the bridge, and takes the Yalu Zangbo River Bridge as the engineering background, and uses the software of Midas-Civil structure calculation and analysis to simulate the construction process of the bridge. In the course of construction, strictly according to the monitoring scheme that has been formulated, at the same time, the actual measurement of the structure force, line shape and other data in each stage of construction is carried out, and then through the comparison between the measured value and the theoretical value, the analysis is made to find out the reasons, etc. Identification, prediction and final adjustment of the errors, and with the progress of the construction cycle, the actual state of the bridge structure in the construction process is as close as possible to the theoretical calculation state, and the above steps are repeated. Finally, the bridge is closed smoothly and the stress is controlled during construction. Although the long-span prestressed concrete box girder bridge is widely used because of its many advantages, it is inevitable that the box girder body cracks, because the temperature has a great influence on the stress of the bridge. Especially under the conditions of rapid temperature change and low temperature in Tibet, it is necessary to analyze and predict whether the anti-cracking ability of the bridge meets the local climatic conditions. At the same time, during winter construction, the temperature difference between inside and outside of the box is large, and in this condition the tensile stress will be produced, so it is necessary to control the temperature difference and the tensile stress value of the inside and outside of the box reasonably. This ensures that the concrete does not crack during the curing period prior to the prestress tension. In this paper, the influence of temperature change on the stress of long-span continuous bridge is analyzed. Taking the Yalu Zangbo River No. 3 super bridge of the La-Ji railway as an example, the box section long-span bridge is calculated by using Midas-Civil software. Under the action of sunshine, the maximum stress of beam body is analyzed, the position where cracks are most likely to occur is analyzed, and the necessary measures are taken in advance, and the Midas-FEA calculation software is used to analyze the relative closed box section during the construction and maintenance period in winter. Under the actual condition of the temperature inside the box and the temperature higher than the outside, the stress value of a single pouring block is analyzed, which provides a necessary reference for the setting of maintenance temperature in winter construction.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.4;U448.23
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