本文關(guān)鍵詞：剛構(gòu)—連續(xù)組合梁橋雙肢薄壁墩設(shè)計(jì)參數(shù)的分析與優(yōu)化　出處：《蘭州交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 剛構(gòu)—連續(xù)組合梁橋 雙肢薄壁墩 參數(shù)分析 計(jì)算流體力學(xué) 設(shè)計(jì)優(yōu)化

【摘要】：剛構(gòu)—連續(xù)組合梁橋是國內(nèi)外廣泛應(yīng)用的橋型,它汲取了T型剛構(gòu)和連續(xù)梁橋的優(yōu)勢,同時(shí)也彰顯出自身的特點(diǎn)。剛構(gòu)—連續(xù)組合梁橋長聯(lián)、大跨,減少了橋梁伸縮裝置的設(shè)置數(shù)量,使得行車舒適性增加,同時(shí)也避免了大噸位支座的使用,降低了橋梁養(yǎng)護(hù)工作的難度。但長聯(lián)、大跨的剛構(gòu)—連續(xù)組合梁橋?qū)囟�、混凝土的收縮、徐變等異常敏感,為了減小以上因素對(duì)橋梁結(jié)構(gòu)的影響就必須對(duì)剛構(gòu)墩的各項(xiàng)設(shè)計(jì)參數(shù)進(jìn)行分析和優(yōu)化。雙肢薄壁墩是剛構(gòu)—連續(xù)組合梁橋的剛構(gòu)墩最常用的墩身形式。雙肢薄壁墩的單肢壁厚是墩身抗推剛度的主要影響因素;雙肢間距則是墩身抗彎剛度主要影響因素,因此,它們是雙肢薄壁墩最重要的兩個(gè)設(shè)計(jì)參數(shù)。本文以某黃河大橋?yàn)楣こ瘫尘斑M(jìn)行了以下研究:(1)研究了雙肢薄壁墩的單肢壁厚及雙肢間距這兩個(gè)參數(shù)對(duì)剛構(gòu)—連續(xù)組合梁橋內(nèi)力、變形及穩(wěn)定性的影響。通過對(duì)橋梁有限元模型的分析計(jì)算,得到了橋梁結(jié)構(gòu)內(nèi)力及變形隨著單肢壁厚和雙肢間距變化的規(guī)律;給出了最大懸臂狀態(tài)時(shí)橋墩穩(wěn)定性與單肢壁厚、雙肢間距的關(guān)系,給同類型橋梁剛構(gòu)墩的設(shè)計(jì)提供了參考。(2)利用CFD方法對(duì)雙肢薄壁墩附近風(fēng)場進(jìn)行了數(shù)值模擬,分別研究了矩形截面的寬高比與阻力系數(shù)的關(guān)系,以及不同風(fēng)攻角作用下雙肢薄壁墩的單肢壁厚和雙肢間距的變化對(duì)橋墩的氣動(dòng)三分力系數(shù)的影響。(3)根據(jù)雙薄壁墩的結(jié)構(gòu)受力情況,假定剛構(gòu)墩頂?shù)闹髁簞偠葻o窮大且雙薄壁墩的雙肢變形完全一致,將剛構(gòu)墩頂受力與雙薄壁墩的單肢受力聯(lián)系起來,以墩身截面積最小為目標(biāo)函數(shù),考慮強(qiáng)度和穩(wěn)定性約束條件,建立基于ANSYS的雙薄壁墩的單肢壁厚和雙肢間距的優(yōu)化數(shù)學(xué)模型,通過ANSYS的優(yōu)化模塊實(shí)現(xiàn)了雙肢薄壁墩的設(shè)計(jì)參數(shù)優(yōu)化。
[Abstract]:Rigid-continuous composite beam bridge is widely used at home and abroad. It draws the advantages of T-type rigid frame and continuous beam bridge, but also shows its own characteristics. Rigid frame-continuous composite beam bridge has long connection and long span. Reduce the number of bridge telescopic devices, make the driving comfort increased, but also avoid the use of large tonnage support, reduce the difficulty of bridge maintenance. Long-span rigid frame-continuous composite beam bridges are very sensitive to temperature, concrete shrinkage, creep and so on. In order to reduce the influence of the above factors on the bridge structure, it is necessary to analyze and optimize the design parameters of the rigid frame pier. The two-leg thin-walled pier is the most commonly used pier for the rigid frame pier of the rigid-frame continuous composite beam bridge. The single limb wall thickness of pier is the main factor that affects the pushing stiffness of pier body. The distance between two limbs is the main factor affecting the bending stiffness of the pier body. They are two of the most important design parameters for two-leg thin-walled piers. This paper takes a Yellow River Bridge as the engineering background and makes the following research: 1). The internal force of rigid frame-continuous composite beam bridge is studied by the two parameters of single limb wall thickness and double limb spacing of two-leg thin-walled pier. The influence of deformation and stability. Through the analysis and calculation of the finite element model of the bridge, the variation of the internal force and deformation of the bridge structure with the wall thickness of the single limb and the distance between the two legs is obtained. The relationship between the stability of the pier and the wall thickness of the single limb and the distance between the two limbs under the maximum cantilever state is given. This paper provides a reference for the design of rigid frame pier of the same type of bridge. Using the CFD method, the wind field near the two-leg thin-walled pier is numerically simulated, and the relationship between the ratio of width to height of rectangular section and the coefficient of resistance is studied respectively. And under the action of different wind attack angle, the influence of the change of the wall thickness and the distance between the two limbs on the aerodynamic force coefficient of the bridge pier under the action of different wind attack angle. 3) according to the structure stress condition of the double thin-walled pier. Assuming that the stiffness of the main beam at the top of the rigid frame pier is infinite and the deformation of the double thin wall pier is completely consistent, the force on the top of the rigid frame pier is connected with the single limb force of the double thin-walled pier, and the minimum section area of the pier is taken as the objective function. Considering the constraint conditions of strength and stability, an optimal mathematical model of the wall thickness and the distance between two limbs of double thin-walled pier based on ANSYS is established. The design parameters of double-leg thin-walled pier are optimized by ANSYS optimization module.
【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)】：U442.5

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