本文選題：剛構(gòu)橋 + 有限元��； 參考：《蘭州交通大學(xué)》2015年碩士論文

【摘要】：隨著我國(guó)交通建設(shè)的迅速發(fā)展,連續(xù)剛構(gòu)橋施工技術(shù)趨于成熟,但連續(xù)剛構(gòu)橋成橋后隨著使用年限的增加,溫度變化、地基沉降等引起的次內(nèi)力以及運(yùn)營(yíng)過(guò)程中承受的活荷載導(dǎo)致連續(xù)剛構(gòu)橋出現(xiàn)多種病害,包括“跨中撓度過(guò)大”、“混凝土開(kāi)裂”等質(zhì)量問(wèn)題。本文對(duì)北峪河大橋施工過(guò)程及承載能力驗(yàn)算進(jìn)行了分析,該橋是預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋,對(duì)該橋建立三維空間有限元模型,通過(guò)模擬施工階段,以及添加荷載等,對(duì)北峪河大橋主要階段進(jìn)行了全三維有限元模擬分析。結(jié)合橋梁設(shè)計(jì)與施工需要,探討了連續(xù)剛構(gòu)橋特點(diǎn)及受力特點(diǎn),為連續(xù)剛構(gòu)橋的設(shè)計(jì)和施工提供一些經(jīng)驗(yàn),保證工程的順利進(jìn)行。根據(jù)施工階段的變化不斷修正有限元模型參數(shù),得出各個(gè)施工階段各控制點(diǎn)位移和應(yīng)力的理論數(shù)據(jù),從施工階段法向壓應(yīng)力驗(yàn)算、受拉區(qū)鋼筋拉應(yīng)力驗(yàn)算、使用階段正截面壓應(yīng)力驗(yàn)算以及使用階段斜截面主壓應(yīng)力驗(yàn)算,使現(xiàn)場(chǎng)施工監(jiān)測(cè)數(shù)據(jù)有所參照。對(duì)現(xiàn)場(chǎng)施工過(guò)程實(shí)施控制點(diǎn)的位移監(jiān)測(cè)和控制截面的應(yīng)力監(jiān)測(cè),將現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)與理論設(shè)計(jì)數(shù)據(jù)對(duì)比分析,得出各施工階段滿足設(shè)計(jì)要求的結(jié)論,對(duì)施工過(guò)程進(jìn)行了有效的監(jiān)控。此外,還對(duì)該大橋進(jìn)行了主梁結(jié)構(gòu)安全性驗(yàn)算,得出各項(xiàng)驗(yàn)算均滿足設(shè)計(jì)要求的結(jié)論。在成橋后,還對(duì)北峪河大橋進(jìn)行了預(yù)拱度的計(jì)算,主要計(jì)算成橋合龍階段、運(yùn)營(yíng)5年和運(yùn)營(yíng)15年橋梁徐變撓度的區(qū)別,從控制徐變發(fā)展、避免主拉應(yīng)力超標(biāo)兩方面著手防治跨中塌腰,分析計(jì)算合理的預(yù)拱度設(shè)置。對(duì)橋梁長(zhǎng)期徐變引起的塌腰現(xiàn)象進(jìn)行了分析。綜上所述,通過(guò)本文對(duì)北峪河大橋的施工過(guò)程及承載能力驗(yàn)算分析,得出該大橋的承載能力滿足設(shè)計(jì)要求,通過(guò)實(shí)際監(jiān)測(cè)數(shù)據(jù)對(duì)各種有限元模擬參數(shù)進(jìn)行估計(jì)和修正,用于指導(dǎo)和控制施工,使得各施工階段的實(shí)際狀態(tài)都最大限度地接近理想狀態(tài),確保了成橋后的內(nèi)力狀態(tài)和幾何線型符合設(shè)計(jì)要求。
[Abstract]:With the rapid development of traffic construction in China, the construction technology of continuous rigid frame bridge tends to be mature, but the temperature of continuous rigid frame bridge changes with the increase of service life. The secondary internal force caused by the settlement of the foundation and the living load in the course of operation lead to a variety of diseases of the continuous rigid frame bridge, including "excessive deflection in the span", "cracking of concrete" and other quality problems. In this paper, the construction process and load carrying capacity of Beiyu River Bridge are analyzed. The bridge is a prestressed concrete continuous rigid frame bridge. A three-dimensional finite element model is established for the bridge. The three-dimensional finite element simulation analysis of the main stage of Beiyu River Bridge is carried out. Combined with the needs of bridge design and construction, this paper discusses the characteristics and mechanical characteristics of continuous rigid frame bridge, which provides some experience for the design and construction of continuous rigid frame bridge and ensures the smooth progress of the project. According to the change of the construction stage, the parameters of the finite element model are constantly revised, and the theoretical data of the displacement and stress of each control point in each construction stage are obtained. The normal compressive stress in the construction stage and the tensile stress in the tension zone are checked. The checking calculation of the normal section stress in the use stage and the main compressive stress of the oblique section in the use stage makes the site construction monitoring data reference. The displacement monitoring of the control point and the stress monitoring of the control section are carried out in the field construction process. The field measured data and the theoretical design data are compared and analyzed, and the conclusion is drawn that each construction stage meets the design requirements. The construction process is monitored effectively. In addition, the safety calculation of the main girder structure of the bridge is carried out, and the conclusion is drawn that all the checking calculations meet the design requirements. After the completion of the bridge, the pre-arch degree of the Beiyu River Bridge is calculated. The difference between the bridge creep deflection in the closing stage, the operation for 5 years and the operation for 15 years is mainly calculated, and the development of the bridge creep is controlled. To prevent the main tensile stress from exceeding the standard, to prevent the mid-span collapse, and to analyze and calculate the reasonable pre-arch setting. The collapse phenomenon caused by long-term creep of bridges is analyzed. To sum up, through the analysis of the construction process and load carrying capacity of Beiyu River Bridge in this paper, it is concluded that the bearing capacity of the bridge meets the design requirements, and various finite element simulation parameters are estimated and corrected by the actual monitoring data. It is used to guide and control the construction, which makes the actual state of each construction stage as close as possible to the ideal state, and ensures that the internal force state and geometric alignment after the completion of the bridge meet the design requirements.
【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】：2015
【分類號(hào)】：U445

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本文編號(hào)：1901860