發(fā)布時(shí)間：2018-07-07 16:08

  本文選題：下承式系桿拱橋 + 有限元理論　； 參考：《蘭州交通大學(xué)》2014年碩士論文

【摘要】：下承式系桿拱橋?qū)⒘骸⒐皟煞N結(jié)構(gòu)有機(jī)結(jié)合，以其受力合理、剛度大、造型優(yōu)美而受到橋梁界的普遍歡迎。論文以廣西沿海鐵路擴(kuò)能改造工程欽江特大橋主橋128m鋼管混凝土系桿拱橋?yàn)楸尘罢归_(kāi)施工監(jiān)控研究，主要研究?jī)?nèi)容如下： (1)概括介紹了國(guó)內(nèi)外下承式系桿拱橋的發(fā)展現(xiàn)狀及發(fā)展趨勢(shì)，對(duì)下承式系桿拱橋的受力特點(diǎn)及目前存在的問(wèn)題進(jìn)行了詳細(xì)闡述并引出了基于有限元理論的下承式系桿拱橋的分析原則和施工控制的相關(guān)理論。 (2)采用自適應(yīng)控制法對(duì)欽江橋的主梁線形進(jìn)行監(jiān)測(cè)，利用最小二乘法對(duì)本橋主要參數(shù)進(jìn)行識(shí)別，并對(duì)梁體變形作出預(yù)測(cè)，從而確定立模標(biāo)高；通過(guò)對(duì)影響拱肋預(yù)拱度的因素和設(shè)置方法進(jìn)行對(duì)比分析，結(jié)合工程實(shí)際和相關(guān)計(jì)算方法給出欽江橋的拱肋預(yù)拱度；最后通過(guò)對(duì)各個(gè)施工階段的實(shí)測(cè)線形和計(jì)算結(jié)果對(duì)比分析得出主梁、拱肋滿足設(shè)計(jì)線形要求。 (3)欽江橋的混凝土應(yīng)力和鋼管拱肋表面應(yīng)力監(jiān)測(cè)分別采用JMZX-422AT記憶溫度型鋼筋應(yīng)力計(jì)和JMZX-416型智能數(shù)碼弦式應(yīng)變計(jì)；利用成熟理論對(duì)測(cè)試數(shù)據(jù)進(jìn)行分析處理得出混凝土的收縮、徐變引起的結(jié)構(gòu)非受力部分應(yīng)變可占到全部應(yīng)變的30%～40%。 (4)利用ANSYS實(shí)體單元對(duì)拱腳局部應(yīng)力進(jìn)行分析得出欽江拱腳結(jié)構(gòu)整體上受力合理；其中建議設(shè)計(jì)施工時(shí)可適當(dāng)沿著拱腳表面對(duì)拱腳進(jìn)行加強(qiáng)。 (5)對(duì)現(xiàn)有合理的施工索力確定方法和索力測(cè)試法進(jìn)行相關(guān)探討，，綜合實(shí)際情況對(duì)比分析，分別選取影響矩陣法和頻率法作為欽江橋調(diào)索和索力測(cè)試的理論依據(jù)，最終成橋索力值與設(shè)計(jì)值以5%以內(nèi)的誤差說(shuō)明了本橋采用的影響矩陣作為調(diào)索理論的合理性。
[Abstract]:The through tie arch bridge combines the beam and arch structure organically, and is generally welcomed by the bridge because of its reasonable force, large stiffness and graceful shape. Based on the 128m CFST tied arch bridge of Qinjiang super bridge in Guangxi coastal railway capacity expansion project, the construction monitoring and control research is carried out in this paper. The main research contents are as follows: (1) the present situation and development trend of the through tie arch bridge at home and abroad are introduced. The stress characteristics and existing problems of through tied arch bridge are expounded in detail, and the analysis principle and construction control theory of through tie arch bridge based on finite element theory are introduced. Adaptive control method is used to monitor the alignment of the main beam of Qinjiang Bridge. The main parameters of the bridge are identified by using the least square method, and the deformation of the beam body is forecasted so as to determine the elevation of the vertical die, and the factors affecting the pre-arch degree of the arch rib and the setting method are compared and analyzed. Combined with engineering practice and related calculation method, the arch rib pre-arch degree of Qinjiang Bridge is given. Finally, the main beam is obtained by comparing and analyzing the measured alignment and calculation results of each construction stage. (3) the concrete stress of Qinjiang Bridge and the surface stress of steel pipe arch rib are monitored by JMZX-422AT memory temperature stress meter and JMZX-416 intelligent digital string strain gauge; The shrinkage of concrete is obtained by using mature theory to analyze and deal with the test data. The non-stress partial strain of the structure caused by creep can account for 30% of the total strain. (4) by using ANSYS solid element to analyze the local stress of arch foot, it is concluded that the overall stress of Qinjiang arch foot structure is reasonable. It is suggested that the arch foot should be strengthened properly along the surface of the arch foot in design and construction. (5) the existing reasonable methods for determining the cable force and the test method for the cable force should be discussed, and the actual situation should be compared and analyzed synthetically. The influence matrix method and the frequency method are selected as the theoretical basis for cable adjustment and cable force test of Qinjiang Bridge respectively. Finally, the error between the cable force value and the design value of the bridge is less than 5%, which shows the rationality of the influence matrix used in this bridge as the cable adjustment theory.
【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;U448.225

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本文編號(hào)：2105496