本文選題：空腹式　切入點：剛構(gòu)橋　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：空腹式梯形箱梁連續(xù)剛構(gòu)橋的造型新穎,具有拱橋和連續(xù)剛構(gòu)橋的力學(xué)性能特點。以涪江一橋為依托工程,建立該空腹式梯形箱梁連續(xù)剛構(gòu)橋的有限元模型,對橋梁結(jié)構(gòu)各個施工階段的內(nèi)力、應(yīng)力以及施工階段穩(wěn)定性問題進行了理論分析,并由此確定了施工重點監(jiān)測點,通過監(jiān)控實測并結(jié)合理論值指導(dǎo)施工。有如下結(jié)論： (1)闡述了預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋的模擬施工階段結(jié)構(gòu)計算方法,即正裝法和倒裝法,經(jīng)過分析比較,確定了模擬空腹式梯形箱梁連續(xù)剛構(gòu)橋的施工階段采用正裝計算法,能夠明顯減小計算量。 (2)以涪江一橋為依托工程,按照現(xiàn)有施工組織設(shè)計建立了有限元模型,采用了正裝法模擬計進行分析計算,分析了該橋在各個施工階段在靜荷載作用下內(nèi)力的分布情況和各梁段可能出現(xiàn)的最大內(nèi)力,分析結(jié)果表明各階段在靜荷載作用下內(nèi)力分布合理,在整個施工過程中各梁段的最大內(nèi)力均在規(guī)范限值內(nèi),結(jié)構(gòu)是安全可靠的。 (3)分析了主梁最大懸臂狀態(tài)和成橋狀態(tài)結(jié)構(gòu)的穩(wěn)定性!結(jié)果表明成橋狀態(tài)整體結(jié)構(gòu)彈性屈曲安全系數(shù)為81.4,失穩(wěn)模態(tài)為主梁豎向彎曲失穩(wěn)；最大懸臂狀態(tài)整體結(jié)構(gòu)彈性屈曲安全系數(shù)為67.6,失穩(wěn)模態(tài)為橋墩側(cè)向彎曲失穩(wěn)。 (4)施工過程中對各施工階段的應(yīng)力進行了監(jiān)測,分析了三個主要控制截面的應(yīng)力,結(jié)果表明主要控制截面的應(yīng)力實測值和理論計算值的變化趨勢吻合度較好,只有個別測點因混凝土齡期、收縮徐變以及溫度等因素的影響表現(xiàn)出較大的波動性,但整體上是符合荷載施加時產(chǎn)生的應(yīng)力分布規(guī)律。 (5)通過對成橋后的標(biāo)高進行測量,發(fā)現(xiàn)成橋線形與設(shè)計理想線形吻合度較好,大部分測點與設(shè)計值之間的誤差均在20mm以內(nèi)。
[Abstract]:The continuous rigid frame bridge with hollow trapezoidal box girder is novel in shape and has the characteristics of mechanical properties of arch bridge and continuous rigid frame bridge. The finite element model of the continuous rigid frame bridge of the hollow trapezoid box girder is established based on the Fujiang first bridge. In this paper, the internal force, stress and stability of the bridge structure in each construction stage are theoretically analyzed, and the key monitoring points of construction are determined. The construction is guided by monitoring and measuring and combining with the theoretical value. The conclusions are as follows:. This paper expounds the calculation methods of the structure of prestressed concrete continuous rigid frame bridge in the simulated construction stage, that is, the normal loading method and the inversion method. Through the analysis and comparison, it is determined that the construction stage of the continuous rigid frame bridge with simulated empty web trapezoidal box girder is based on the normal fitting calculation method. The computational complexity can be reduced obviously. Based on the Fujiang Bridge, the finite element model is established according to the existing construction organization design, and the analysis and calculation are carried out by using the formal dress method simulator. The distribution of internal force under static load and the maximum internal force in each section of beam are analyzed in this paper. The results show that the distribution of internal force in each stage under static load is reasonable. In the whole construction process, the maximum internal force of each beam section is within the limit value of the code, and the structure is safe and reliable. The stability of the maximum cantilever state and the bridge state structure of the main beam is analyzed. The results show that the safety factor of elastic buckling of the whole structure is 81.4, the main mode of instability is the vertical bending instability of the beam, and the safety factor of elastic buckling of the whole structure under the maximum cantilever state is 67.6, and the instability mode is the lateral bending instability of the pier. 4) during the construction process, the stress of each construction stage is monitored, and the stress of the three main control sections is analyzed. The results show that the variation trend of the measured stress values and the theoretical calculated values of the main control sections is in good agreement. Only a few measuring points show great fluctuation due to concrete age, shrinkage, creep and temperature, but as a whole accord with the law of stress distribution under load. 5) by measuring the elevation of the bridge, it is found that the alignment between the completed bridge and the ideal design is good, and the error between most of the measured points and the design value is less than 20mm.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.4

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