【摘要】：預(yù)應(yīng)力混凝土曲線梁橋由于其線型優(yōu)美且與環(huán)境協(xié)調(diào)、經(jīng)濟(jì)性好、抗扭剛度大等一系列優(yōu)點(diǎn)已經(jīng)成為現(xiàn)代交通工程中一種重要的橋型。但在營(yíng)運(yùn)過程中也出現(xiàn)了大量的病害，惡性事故頻有發(fā)生。因此對(duì)連續(xù)箱梁橋的力學(xué)性能的研究非常必要。本文首先討論了彎橋的幾種基本理論與計(jì)算方法，包括弗拉索夫彈性薄壁結(jié)構(gòu)理論，平面曲梁的平衡微分方程，力與應(yīng)變關(guān)系的圓弧微分方程等。然后采用結(jié)構(gòu)有限元理論基礎(chǔ)，以某一座實(shí)際工程中的曲線梁橋?yàn)槔�，利用有限元分析程序建立結(jié)構(gòu)模型，采用單參數(shù)影響分析法對(duì)影響曲線梁橋的幾個(gè)重要因素（曲率半徑，支撐方式，支撐偏移，預(yù)應(yīng)力鋼絞線張拉順序等）進(jìn)行分析計(jì)算比較與歸納。具體內(nèi)容如下： 1）通過對(duì)不同曲率半徑的曲線梁橋進(jìn)行計(jì)算分析可知，曲率半徑越大，曲線梁橋y方向的位移會(huì)減小，最大主拉應(yīng)力有所減小，最大主壓應(yīng)力有所增大。支座的受力也更加均勻合理。故在做曲線梁橋設(shè)計(jì)時(shí)，盡量采用曲率半徑比較大的曲線。這樣不僅橋梁美觀，其受力也會(huì)更加合理。 2）通過對(duì)不同支撐方式的曲線梁橋進(jìn)行對(duì)比分析，可以得出抗扭支撐與點(diǎn)鉸支撐相比其z方向最大撓度值減小20.6%，，最小撓度值的絕對(duì)值減小43.3%。這說明設(shè)置抗扭支撐可以有效控制曲線梁橋的豎向變形。另外點(diǎn)鉸支撐橋臺(tái)支座會(huì)受到更大的扭矩。而且，相對(duì)點(diǎn)鉸支撐，抗扭支撐梁體內(nèi)力值也會(huì)更加均勻。 3）通過對(duì)曲線梁橋點(diǎn)鉸支撐偏移與抗扭支撐偏移可以得出，對(duì)于本橋，若跨中采用點(diǎn)鉸支撐則向外偏移25cm左右最為合適。此時(shí)橋臺(tái)支座所受到的扭矩與支反力最為均勻，差值最小。曲線梁橋y方向變形也有一定程度地減小。若跨中采用抗扭支撐，支座偏移對(duì)曲線梁扭矩內(nèi)力有一定影響，對(duì)其余因素?zé)o明顯影響，考慮扭矩因素向外偏置15cm比較合適。 4）通過模擬曲線梁橋施工階段預(yù)應(yīng)力鋼絞線不同張拉順序，可以得出不同張拉順序?qū)χ髁鹤畲笾骼瓚?yīng)力有一定影響，對(duì)其余因素?zé)o明顯影響。綜合考慮，建議此曲線箱梁橋采用先外側(cè)后內(nèi)側(cè)的張拉順序。
[Abstract]:The prestressed concrete curved girder bridge has become an important bridge type in modern traffic engineering because of its good alignment and coordination with the environment, good economy, high torsional stiffness and so on. However, a large number of diseases also appear in the course of operation, and malignant accidents occur frequently. Therefore, it is necessary to study the mechanical properties of continuous box girder bridge. In this paper, several basic theories and calculation methods of curved bridge are discussed, including Vlasov elastic thin-walled structure theory, equilibrium differential equation of plane curved beam, circular arc differential equation of the relationship between force and strain, etc. Then, based on the theory of structural finite element, taking a curved beam bridge in a practical project as an example, the structural model is established by using finite element analysis program, and several important factors (radius of curvature) affecting the curved beam bridge are analyzed by single parameter influence analysis method. Support mode, support offset, tension sequence of prestressed steel strands, etc.) are analyzed, compared and summarized. The main contents are as follows: 1) through the calculation and analysis of curved girder bridges with different radius of curvature, it can be seen that the larger the radius of curvature, the smaller the displacement in the y direction and the smaller the maximum principal tensile stress of the curved girder bridges. The maximum principal compressive stress increases. The bearing force is more even and reasonable. Therefore, in the design of curved girder bridge, the curve with larger radius of curvature should be used as far as possible. In this way, not only is the bridge beautiful, but its force will also be more reasonable. 2) through the comparative analysis of curved girder bridges with different supporting modes, It can be concluded that the maximum deflection value in z direction and the absolute value of minimum deflection value in torsional bracing are reduced 20.6and 43.3% respectively compared with point hinge bracing. This shows that torsional bracing can effectively control the vertical deformation of curved girder bridge. Another point hinge support abutment support will be subjected to greater torque. Moreover, the force value of torsional bracing beam will be more uniform than that of point hinge bracing. 3) it can be obtained from the offset of point hinge support and torsional bracing of curved girder bridge. If point hinge bracing is adopted in the middle of span, the 25cm is most suitable to shift outward. At this time, the bridge abutment bearing is subjected to the most uniform torque and supporting reaction force, and the difference is minimum. The y direction deformation of curved girder bridge is also reduced to a certain extent. If torsional bracing is adopted in the middle of the span, the bearing offset has a certain influence on the internal force of the torque of the curved beam, but has no obvious effect on the other factors. Considering the torque factor, it is more appropriate to bias 15cm out. 4) by simulating the different tension sequence of prestressed steel strand in the construction stage of curved girder bridge, it can be concluded that different tension sequence has certain influence on the maximum main tensile stress of the main girder. There was no significant effect on other factors. Considering comprehensively, it is suggested that this curved box girder bridge should use the tension sequence of the first outer side and the inner side.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.5;U448.213

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