本文關(guān)鍵詞：溫嶺市躍進(jìn)橋方案設(shè)計(jì)與結(jié)構(gòu)優(yōu)化分析研究　出處：《浙江工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 寬跨比 方案設(shè)計(jì)與比選 鋼管混凝土拱橋 有限元 優(yōu)化設(shè)計(jì) 靜動力分析

【摘要】：隨著經(jīng)濟(jì)發(fā)展,交通壓力增大,為了滿足交通需要,城市道路路幅越來越寬,寬跨比也越來越大,部分橋梁寬跨比甚至超過1。與此同時(shí),大眾對作為公共建筑物的橋梁的美學(xué)提出越來越高的要求,拱橋由于其造型多變,具有獨(dú)特的美學(xué)價(jià)值及相比斜拉橋、懸索橋等景觀橋而言較為經(jīng)濟(jì),在方案設(shè)計(jì)中常常被選中。本文以躍進(jìn)橋改建工程作為研究背景進(jìn)行了方案設(shè)計(jì),然后重點(diǎn)對實(shí)施方案,即鋼管混凝土拱橋進(jìn)行優(yōu)化設(shè)計(jì)分析。在優(yōu)化設(shè)計(jì)分析中通過Midas Civil 2013軟件對此拱橋建立了僅含上部結(jié)構(gòu)的有限元模型和包含下部結(jié)構(gòu)的整體有限元模型,比較了兩種建模方法的優(yōu)缺點(diǎn),對兩種模型的計(jì)算進(jìn)行了比較分析,對包含下部結(jié)構(gòu)的整體有限元模型討論了m值選取對其計(jì)算結(jié)果的影響;分析比較了按照不同國家規(guī)范的考慮剪力滯效應(yīng)翼緣有效寬度計(jì)算；然后,在含下部結(jié)構(gòu)的整體模型的基礎(chǔ)上分別構(gòu)建了多個(gè)靜力計(jì)算模型,分析了鋼箱梁剛度、鋼管壁厚、吊桿初張力、次拱初張力對橋梁關(guān)鍵構(gòu)件的內(nèi)力和變形的影響；最后,通過改變鋼管壁厚、拱肋傾角等因素對拱的穩(wěn)定系數(shù)及全橋動力特性進(jìn)行了分析比較。研究結(jié)果表明,在初步設(shè)計(jì)階段為節(jié)約機(jī)時(shí)可采用僅含上部結(jié)構(gòu)的有限元分析模型,而在施工圖設(shè)計(jì)階段宜采用含下部結(jié)構(gòu)的整體有限元分析模型進(jìn)行各項(xiàng)計(jì)算和驗(yàn)算；比較歐洲規(guī)范與中國規(guī)范(征求意見稿)所計(jì)算出的躍進(jìn)橋鋼箱梁的翼緣有效寬度,歐洲規(guī)范計(jì)算結(jié)果更偏于安全；次拱對全橋的穩(wěn)定有很大的貢獻(xiàn),同時(shí),其張拉力的大小對樁頂位移、拱腳鋼管內(nèi)混凝土拉應(yīng)力及拱頂橫橋向位移均有較大的影響,因此是全橋中關(guān)鍵構(gòu)件,應(yīng)留有足夠的安全度；另外,就次拱初張力取值提出了建議；吊桿、鋼箱梁的剛度、鋼管壁厚都在不同程度上影響全橋的內(nèi)力和位移。鋼管壁厚、拱肋傾角極大地影響全橋的穩(wěn)定性和動力特性。本文基于既有有限元軟件對這類大寬跨比鋼管混凝土拱橋進(jìn)行了靜、動力分析,其研究成果為后續(xù)的施工圖設(shè)計(jì)或修改提供了改進(jìn)依據(jù),同時(shí)也對類似橋梁的設(shè)計(jì)具有一定的工程參考價(jià)值。
[Abstract]:With the development of economy, traffic pressure is increasing. In order to meet the traffic needs, the road width and the ratio of width to span of urban roads are becoming wider and wider, and the ratio of width to span of some bridges even exceeds 1. At the same time. The public put forward higher and higher requirements for the aesthetics of bridges as public buildings. Because of its changeable shape, arch bridges have unique aesthetic value and are more economical than cable-stayed bridges, suspension bridges and other landscape bridges. In the project design is often selected. This paper takes the leaping bridge reconstruction project as the research background, and then focuses on the implementation of the scheme. That is, the concrete filled steel tube arch bridge is optimized and analyzed. In the process of optimization design analysis, Midas Civil is adopted. The finite element model of the arch bridge including only the superstructure and the whole finite element model including the substructure are established by the software of 2013. The advantages and disadvantages of the two modeling methods are compared and the calculation of the two models is compared and analyzed. The influence of the selection of m value on the calculation results is discussed for the whole finite element model including the substructure. The effective width calculation of flange considering shear lag effect according to different national codes is analyzed and compared. Then, on the basis of the whole model with substructure, several static calculation models are constructed, and the stiffness of steel box girder, the wall thickness of steel pipe and the initial tension of suspender are analyzed. The influence of the initial tension of the secondary arch on the internal force and deformation of the key components of the bridge; Finally, the stability coefficient of arch and the dynamic characteristics of the whole bridge are analyzed and compared by changing the thickness of the steel pipe wall and the inclination of the arch rib. The results show that the stability coefficient of the arch and the dynamic characteristics of the whole bridge are analyzed and compared. The finite element analysis model with superstructure only can be used in the preliminary design stage, but the whole finite element analysis model with substructure should be used to calculate and check calculation in the construction drawing design stage. Compared with the effective flange width of the steel box girder of the leapfrog bridge calculated by the European Code and the Chinese Code (draft for comments), the calculation results of the European Code are more safety. The secondary arch has a great contribution to the stability of the whole bridge. At the same time, the magnitude of the tension force has a great influence on the displacement of the pile top, the concrete tensile stress in the steel tube with arch foot and the displacement of the transverse bridge with the arch top, so it is a key component in the whole bridge. Adequate safety should be left; In addition, some suggestions are put forward to determine the initial tension of the secondary arch. The stiffness of suspenders and steel box girders and the wall thickness of steel pipe all affect the internal force and displacement of the whole bridge to some extent. The slope angle of arch rib greatly affects the stability and dynamic characteristics of the whole bridge. Based on the existing finite element software, the static and dynamic analysis of this kind of concrete filled steel tube arch bridge with large width span ratio is carried out in this paper. The research results provide an improved basis for the subsequent design or modification of construction drawings, and also have a certain engineering reference value for the design of similar bridges.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U442.5

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