本文關(guān)鍵詞：混凝土斜拉橋雙主肋式主梁橋面板的空間受力特性分析　出處：《長(zhǎng)沙理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 混凝土斜拉橋 橋面板 空間受力 板的有效工作寬度 抗裂性能

【摘要】：大跨度預(yù)應(yīng)力混凝土斜拉橋較多地采用雙主肋式主梁,其橋面板的受力性能直接影響到整橋的受力性能。在車(chē)輛荷載作用下,橋面板受力十分復(fù)雜,為了研究雙主肋式主梁橋面板的受力性能,本文以貴州六沖河大橋?yàn)楣こ瘫尘?建立了主梁節(jié)段空間有限元模型,對(duì)橋面板縱向、橫向的支點(diǎn)和跨中截面、角隅處在最不利車(chē)輛荷載下的內(nèi)力和應(yīng)力進(jìn)行了分析,并進(jìn)一步探討了雙主肋式主梁橋面板有效分布寬度的計(jì)算方法和橋面板的抗裂性能。主要研究工作如下：1)介紹我國(guó)混凝土斜拉橋研究概況和發(fā)展趨勢(shì)、混凝土斜拉橋主梁的發(fā)展與特點(diǎn)、雙主肋截面橋面板的研究現(xiàn)狀。對(duì)薄板彎曲理論進(jìn)行論述。2)對(duì)混凝土斜拉橋雙主肋橋面板的建模方法進(jìn)行了研究,應(yīng)用ANSYS軟件建立了貴州六沖河大橋主梁橋面板的空間有限元模型,通過(guò)影響線布載確定了橋面板縱向、橫向支點(diǎn)截面、跨中截面、角隅處的最不利加載位置,并對(duì)以上截面在其最不利布載下的內(nèi)力進(jìn)行了分析。在縱向支點(diǎn)截面最不利布載下,對(duì)橋面板各關(guān)鍵截面的受力性能進(jìn)行了分析,并對(duì)各截面之間的受力進(jìn)行了對(duì)比。3)對(duì)橋面板在縱向支點(diǎn)截面最不利車(chē)輛布載和縱向、橫向跨中截面最不利車(chē)輛布載下板的有效寬度進(jìn)行了計(jì)算,并與按照各國(guó)規(guī)范計(jì)算公式的計(jì)算結(jié)果進(jìn)行了對(duì)比,提出了適應(yīng)于雙主肋橋面板有效寬度的計(jì)算公式。對(duì)橋面板在汽車(chē)荷載作用下的橫向拉應(yīng)力進(jìn)行了研究,分析了雙主肋式橋面板縱向的抗裂性能。
[Abstract]:The long-span prestressed concrete cable-stayed bridge mostly uses the double-main rib main beam, and the performance of the deck slab has a direct impact on the whole bridge's mechanical performance. Under the vehicle load, the load on the deck slab is very complex. In order to study the mechanical behavior of the slab of the main girder bridge with two main ribs, this paper takes the Liuchong River Bridge in Guizhou as the engineering background, and establishes the spatial finite element model of the main girder segment. The longitudinal, transverse fulcrum and the mid-span section of the deck slab are obtained. The internal forces and stresses of the corner under the most unfavorable vehicle loads are analyzed. Furthermore, the calculation method of the effective distribution width of the slab and the crack resistance of the deck slab are discussed. The main research work is as follows: 1) the research situation and the development trend of the concrete cable-stayed bridge in China are introduced. The development and characteristics of the main beam of concrete cable-stayed bridge, the research status of double-rib cross-section deck slab, and the theory of thin plate bending are discussed. 2) the modeling method of double-rib deck slab of concrete cable-stayed bridge is studied. The spatial finite element model of the slab of the main girder bridge of the Liuchong River Bridge in Guizhou is established by using ANSYS software. The longitudinal, transverse fulcrum section and the mid-span section of the deck slab are determined through the influence of the line distribution load. The most unfavorable loading position at the corner and the internal force of the above section under its most unfavorable load are analyzed. Under the most unfavorable load distribution of the longitudinal fulcrum section, the mechanical properties of the key sections of the bridge deck are analyzed. The effective width of the most unfavorable vehicle distribution and longitudinal load of the bridge deck at the longitudinal fulcrum section and the most disadvantageous vehicle distribution under the transverse span mid-section is calculated. 3) the stress between the sections is compared. 3) the effective width of the bridge deck slab under the load of the most disadvantageous vehicle in the longitudinal fulcrum section is calculated. Compared with the calculation results according to the national codes, the calculation formula suitable for the effective width of double-ribbed deck slab is put forward. The transverse tensile stress of bridge deck slab under the action of automobile load is studied. In this paper, the longitudinal crack resistance of double main rib bridge slab is analyzed.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U448.27
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本文編號(hào)：1415916