混合梁斜拉橋輔助墩和結(jié)合段參數(shù)優(yōu)化設(shè)計(jì)研究
發(fā)布時(shí)間：2018-11-23 11:32
【摘要】：隨著我國一大批超大跨徑橋梁的建成,我國正從橋梁大國向橋梁強(qiáng)國邁進(jìn)。要想真正的實(shí)現(xiàn)橋梁強(qiáng)國的夢想,必須從大跨度橋梁的基本科研工作入手,大跨度混合梁斜拉橋的輔助墩以及結(jié)合段的科研工作就是其中一部分。大跨度斜拉橋輔助墩的設(shè)置使邊跨主梁的內(nèi)力分布有明顯改善,而輔助墩位置以及數(shù)量的不同,對主梁內(nèi)力的改善程度不同;結(jié)合段位置直接決定了不同材料主梁的長度比,也就決定了主梁自重分布情況,對主梁內(nèi)力分布影響明顯。因此,輔助墩位置、數(shù)量以及結(jié)合段位置最佳組合的確定對大跨度混合梁斜拉橋的設(shè)計(jì)有著很大影響,具有研究價(jià)值。本文以紅水河大橋?yàn)楣こ瘫尘?運(yùn)用Midas/Civil和ANSYS兩款有限元軟件建立模型,對紅水河大橋的輔助墩位置、輔助墩數(shù)量以及結(jié)合段位置進(jìn)行了研究,研究內(nèi)容主要包含以下幾個(gè)方面:(1)分析了目前常見的斜拉橋合理成橋狀態(tài)確定方法,并根據(jù)本文實(shí)際研究需要,確定了本文所采取的方法。(2)運(yùn)用Midas/Civil建立紅水河大橋原設(shè)計(jì)模型,并修改輔助墩位置、輔助墩數(shù)量以及結(jié)合段位置三個(gè)參數(shù)建立一系列對比模型,通過對比恒載、活載作用下主梁受力情況,得出一些有價(jià)值的結(jié)論,為接下來的結(jié)構(gòu)優(yōu)化設(shè)計(jì)模型的建立提供依據(jù)。(3)介紹紅水河大橋ANSYS模型建立過程以及為結(jié)構(gòu)優(yōu)化設(shè)計(jì)計(jì)算而進(jìn)行的一些簡化。(4)通過對已建成的兩百多座斜拉橋的數(shù)據(jù)統(tǒng)計(jì),結(jié)合一些理論分析,確定紅水河大橋優(yōu)化設(shè)計(jì)的設(shè)計(jì)變量參數(shù)范圍,基于前面計(jì)算研究,確定主梁最小彎曲應(yīng)變能、邊跨應(yīng)力幅、結(jié)合段應(yīng)力幅三個(gè)目標(biāo)函數(shù),并將多目標(biāo)函數(shù)轉(zhuǎn)化為統(tǒng)一標(biāo)函數(shù)。(5)對紅水河大橋的輔助墩位置、輔助墩數(shù)量和結(jié)合段位置三個(gè)參數(shù)進(jìn)行了優(yōu)化,并對優(yōu)化結(jié)果進(jìn)行分析,得出最優(yōu)設(shè)計(jì)方案。
[Abstract]:With the completion of a large number of large span bridges in China, China is moving from a large bridge country to a bridge power. In order to realize the dream of a powerful bridge, we must start with the basic research work of the long-span bridge, and the auxiliary pier and the joint section of the long-span hybrid girder cable-stayed bridge are part of it. The setting of auxiliary piers of long-span cable-stayed bridge can obviously improve the distribution of internal force of side span main beam, but the position and quantity of auxiliary pier are different to the improvement degree of main beam internal force. The position of the combined section directly determines the ratio of the length of the main beam with different materials, which determines the distribution of the weight of the main beam, which has an obvious effect on the distribution of the internal force of the main beam. Therefore, the determination of the optimum combination of auxiliary piers, the number of auxiliary piers and the position of the combined section has great influence on the design of long-span hybrid girder cable-stayed bridges, which is worthy of study. Taking Hongshuihe Bridge as the engineering background, using Midas/Civil and ANSYS software to establish the model, the position of auxiliary pier, the number of auxiliary pier and the position of combined section of Hongshui River Bridge are studied in this paper. The main contents of the study are as follows: (1) the common methods for determining the reasonable state of cable-stayed bridges are analyzed, and the actual research needs of this paper are discussed. The method adopted in this paper is determined. (2) the original design model of Hongshuihe Bridge is established by using Midas/Civil, and a series of comparative models are established by modifying the position of auxiliary pier, the number of auxiliary pier and the position of section. Under the action of live load, some valuable conclusions have been drawn on the stress of the main beam. (3) introduce the process of establishing the ANSYS model of Hongshuihe Bridge and some simplification for the structural optimization design calculation. (4) through the completed 200. Statistics of many cable-stayed bridges, Combined with some theoretical analysis, the parameter range of optimum design variables of Hongshuihe Bridge is determined. Based on the previous calculation, the minimum bending strain energy of main girder, the stress amplitude of side span and the stress amplitude of section are determined. The multi-objective function is transformed into a unified standard function. (5) the position of auxiliary pier, the number of auxiliary piers and the position of joint section of Hongshuihe Bridge are optimized, and the optimization results are analyzed, and the optimal design scheme is obtained.
【學(xué)位授予單位】：交通運(yùn)輸部公路科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.27
本文編號：2351446
[Abstract]:With the completion of a large number of large span bridges in China, China is moving from a large bridge country to a bridge power. In order to realize the dream of a powerful bridge, we must start with the basic research work of the long-span bridge, and the auxiliary pier and the joint section of the long-span hybrid girder cable-stayed bridge are part of it. The setting of auxiliary piers of long-span cable-stayed bridge can obviously improve the distribution of internal force of side span main beam, but the position and quantity of auxiliary pier are different to the improvement degree of main beam internal force. The position of the combined section directly determines the ratio of the length of the main beam with different materials, which determines the distribution of the weight of the main beam, which has an obvious effect on the distribution of the internal force of the main beam. Therefore, the determination of the optimum combination of auxiliary piers, the number of auxiliary piers and the position of the combined section has great influence on the design of long-span hybrid girder cable-stayed bridges, which is worthy of study. Taking Hongshuihe Bridge as the engineering background, using Midas/Civil and ANSYS software to establish the model, the position of auxiliary pier, the number of auxiliary pier and the position of combined section of Hongshui River Bridge are studied in this paper. The main contents of the study are as follows: (1) the common methods for determining the reasonable state of cable-stayed bridges are analyzed, and the actual research needs of this paper are discussed. The method adopted in this paper is determined. (2) the original design model of Hongshuihe Bridge is established by using Midas/Civil, and a series of comparative models are established by modifying the position of auxiliary pier, the number of auxiliary pier and the position of section. Under the action of live load, some valuable conclusions have been drawn on the stress of the main beam. (3) introduce the process of establishing the ANSYS model of Hongshuihe Bridge and some simplification for the structural optimization design calculation. (4) through the completed 200. Statistics of many cable-stayed bridges, Combined with some theoretical analysis, the parameter range of optimum design variables of Hongshuihe Bridge is determined. Based on the previous calculation, the minimum bending strain energy of main girder, the stress amplitude of side span and the stress amplitude of section are determined. The multi-objective function is transformed into a unified standard function. (5) the position of auxiliary pier, the number of auxiliary piers and the position of joint section of Hongshuihe Bridge are optimized, and the optimization results are analyzed, and the optimal design scheme is obtained.
【學(xué)位授予單位】：交通運(yùn)輸部公路科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.27
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，本文編號：2351446
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