【摘要】：曲線斜拉橋是主梁呈曲線的斜拉橋。其兼具彎梁橋和斜拉橋的受力特點(diǎn),主梁在承受彎矩、剪力作用的同時(shí)承受了較大的扭矩作用,其力學(xué)行為比直線斜拉橋更為復(fù)雜,具有高度的空間性。針對(duì)π型主梁曲線斜拉橋的理論分析及設(shè)計(jì)優(yōu)化等問題,依托剛果(布)布拉柴維爾濱河大道曲線斜拉橋項(xiàng)目,以橋梁專用分析軟件Midas/Civil作為計(jì)算平臺(tái),主要針對(duì)曲線斜拉橋最主要的影響參數(shù)—圓心角(弧長(zhǎng)比例、曲率半徑)及其余較重要的設(shè)計(jì)參數(shù)(輔助墩設(shè)置位置、橋塔塔跨比)開展研究分析工作。論文研究的主要內(nèi)容如下:1、詳細(xì)介紹了曲梁橋及斜拉橋的計(jì)算分析理論,通過推導(dǎo)Vlasov方程闡述π型曲線主梁"彎扭耦合"作用,以便對(duì)曲線斜拉橋進(jìn)行精確分析;2、建立全橋有限元模型,將計(jì)算結(jié)果與實(shí)橋?qū)崪y(cè)數(shù)據(jù)進(jìn)行對(duì)比,以驗(yàn)證有限元模型的正確性和合理性;3、結(jié)合專業(yè)知識(shí)及工程實(shí)踐,選取對(duì)曲線斜拉橋結(jié)構(gòu)受力行為有重要影響的設(shè)計(jì)參數(shù)即輔助墩設(shè)置位置、橋塔塔跨比、弧長(zhǎng)比例、曲率半徑4個(gè)關(guān)鍵參數(shù)進(jìn)行參數(shù)分析。基于全橋有限元模型,以通過分別改變這4個(gè)設(shè)計(jì)參數(shù)取值的方式,建立多個(gè)有限元模型,對(duì)計(jì)算結(jié)果進(jìn)行對(duì)比分析,得出單個(gè)設(shè)計(jì)參數(shù)改變對(duì)結(jié)構(gòu)力學(xué)行為的影響規(guī)律及其合理取值范圍。4、基于正交試驗(yàn)設(shè)計(jì)和極差分析方法對(duì)若干設(shè)計(jì)參數(shù)進(jìn)一步進(jìn)行優(yōu)化。以輔助墩設(shè)置位置、橋塔塔跨比、弧長(zhǎng)比例、曲率半徑為4個(gè)因素,每個(gè)因素在較合理范圍內(nèi)確定3個(gè)水平,選取能夠反應(yīng)曲線斜拉橋整體受力性能的10個(gè)特性值作為試驗(yàn)指標(biāo),選用L9(34)正交表,并運(yùn)用極差分析法,確定4個(gè)因素對(duì)單個(gè)指標(biāo)的影響程度大小,找出各指標(biāo)對(duì)應(yīng)的主要因素和次要因素,并得出各因素變化對(duì)各個(gè)指標(biāo)的影響規(guī)律,從而進(jìn)一步優(yōu)化4個(gè)設(shè)計(jì)參數(shù)的合理取值范圍。
[Abstract]:Curved cable-stayed bridge is a curved cable-stayed bridge with main girder. Its mechanical behavior is more complex than that of linear cable-stayed bridge, and its mechanical behavior is more complicated than that of linear cable-stayed bridge. In view of the theoretical analysis and design optimization of 蟺 type main girder curved cable-stayed bridge, the special analysis software Midas/Civil is used as the calculation platform based on the Congo (Brazzaville) Riverside Avenue Curve Cable-Stayed Bridge Project. This paper mainly focuses on the research and analysis of the most important parameters of curved cable-stayed bridge such as the center angle (arc length ratio, curvature radius) and other important design parameters (auxiliary pier location, tower / span ratio). The main contents of this paper are as follows: 1. The theory of calculation and analysis of curved girder bridge and cable-stayed bridge is introduced in detail, and the "bending and torsional coupling" action of 蟺 type curved main girder is explained by deducing the Vlasov equation in order to accurately analyze the curved cable-stayed bridge; 2. The finite element model of the whole bridge is established, and the calculation results are compared with the measured data of the real bridge in order to verify the correctness and rationality of the finite element model. 3. Combined with professional knowledge and engineering practice, the design parameters which have important influence on the stress behavior of curved cable-stayed bridge are analyzed, including the location of auxiliary piers, the ratio of tower to span, the ratio of arc length, and the radius of curvature. Based on the full-bridge finite element model, several finite element models are established by changing the values of the four design parameters, and the calculated results are compared and analyzed. The influence of single design parameter on structural mechanical behavior and its reasonable value range are obtained. 4. Some design parameters are further optimized based on orthogonal design and range analysis method. The location of auxiliary piers, the ratio of tower to tower span, the ratio of arc length and curvature radius are four factors, and each factor is determined three levels within a reasonable range. In this paper, 10 characteristic values which can respond curve cable-stayed bridge are selected as test index, L9 (34) orthogonal table is selected, and the degree of influence of four factors on single index is determined by using range analysis method. The main and secondary factors corresponding to each index are found out, and the influence law of each factor change on each index is obtained, so as to further optimize the reasonable value range of the four design parameters.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U448.27

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 郭珊;曲線斜拉橋模型設(shè)計(jì)及試驗(yàn)研究[D];西南交通大學(xué);2017年

，

本文編號(hào)：2380985