【摘要】：上承式正交異性鋼板桁組合斜拉橋,由于該結(jié)構(gòu)具有自重輕、剛度大、跨越能力強(qiáng)、行車(chē)舒適性好的特點(diǎn),適合用于大跨度山區(qū)高速公路的建設(shè),因而在國(guó)內(nèi)外高速公路大跨、特大跨度橋梁和公鐵兩用橋梁上應(yīng)用越來(lái)越多。而目前在我國(guó)現(xiàn)行技術(shù)規(guī)范中,尚未有針對(duì)鋼橋面板受力體系設(shè)計(jì)的細(xì)化條款說(shuō)明,因此需要對(duì)板桁組合斜拉橋的板桁受力行為做進(jìn)一步研究。論文建立了上承式正交異性鋼板桁組合斜拉橋的空間有限元模型,對(duì)板桁組合體系各主要構(gòu)造因素對(duì)該板桁組合體系的受力行為進(jìn)行了詳細(xì)的分析。隨后,利用板桁連結(jié)系各構(gòu)件在上橫梁位置處的變形協(xié)調(diào)條件,建立平衡方程,進(jìn)一步推導(dǎo)出板桁連結(jié)系內(nèi)力分配關(guān)系的表達(dá)式。同時(shí),針對(duì)板桁連結(jié)系中,影響橫截面?zhèn)髁w系受力行為的條件因素,通過(guò)改變相關(guān)參數(shù),將各因素對(duì)該體系受力行為的影響做客觀的定量分析。之后,根據(jù)上述研究所得板桁組合體系的受力行為,對(duì)其構(gòu)造進(jìn)行優(yōu)化,并通過(guò)有限元分析結(jié)果對(duì)比,驗(yàn)證了該構(gòu)造優(yōu)化方法的正確性和可用性。論文研究結(jié)果表明,板桁連結(jié)系的中縱梁與上弦桿的傳力比,與中縱梁、小縱梁、上橫梁、次橫梁截面剛度呈正比例關(guān)系,與上弦桿截面剛度及橋面板橫梁布置間距呈反比例;而小縱梁與上弦桿的傳力比,與上橫梁、次橫梁截面剛度呈正比例關(guān)系,與上弦桿、中縱梁、小縱梁的截面剛度及橋面板橫梁布置間距呈反比例;在考慮有限橫梁面外剛度的條件下,利用板桁連結(jié)系各桿件在橫梁位置處的變形協(xié)調(diào)條件可建立平衡方程進(jìn)而推導(dǎo)出每個(gè)節(jié)段板桁組合結(jié)構(gòu)各構(gòu)件的縱向荷載傳力比,以此傳力比為目標(biāo)進(jìn)行迭代分析可以有效地對(duì)板桁連結(jié)系的構(gòu)造進(jìn)行優(yōu)化,并使得全橋板桁組合構(gòu)件受力更合理,使用效率更高。
[Abstract]:Because of the characteristics of light weight, large stiffness, strong span ability and good driving comfort, the upper bearing orthotropic steel plate truss composite cable-stayed bridge is suitable for the construction of large-span mountain highway, so it is widely used in expressway construction at home and abroad. More and more large-span bridges and dual-purpose bridges are being used. However, in the current technical code of our country, there is no detailed clause for the design of steel bridge face plate stress system, so it is necessary to further study the behavior of slab truss composite cable-stayed bridge. In this paper, the spatial finite element model of orthotropic steel plate truss composite cable-stayed bridge is established, and the main structural factors of the plate truss composite system are analyzed in detail. Then, the equilibrium equation is established by using the deformation coordination condition of each member of the plate truss connection system at the position of the upper beam, and the expression of the internal force distribution relation of the plate truss connection system is derived. At the same time, according to the condition factors that affect the behavior of the cross section force transmission system in the plate truss connection system, the influence of each factor on the stress behavior of the cross section transmission force system is analyzed objectively by changing the relevant parameters. Then, according to the mechanical behavior of the plate truss composite system, the structure of the composite system is optimized, and the validity and availability of the structure optimization method are verified by comparing the results of finite element analysis. The results show that the force transfer ratio of the middle longitudinal beam to the upper chord is proportional to the stiffness of the middle longitudinal beam, the small longitudinal beam, the upper beam and the secondary beam, and the ratio is inversely proportional to the stiffness of the upper chord section and the arrangement of the bridge deck beam. The ratio of transmission force between the small longitudinal beam and the upper chord is proportional to the cross section stiffness of the upper beam and the secondary beam, and is inversely proportional to the section stiffness of the upper chord, the middle longitudinal beam and the small longitudinal beam, as well as the arrangement distance of the bridge deck beam. Under the condition of considering the external stiffness of a finite beam, the balance equation can be established by using the deformation coordination condition of the members of the plate truss connection system at the position of the beam, and the longitudinal load-transfer ratio of each member of each section of the slab-truss composite structure can be derived. Iterative analysis based on this ratio can effectively optimize the structure of plate truss connection system and make the whole bridge plate truss composite members more reasonable and more efficient in use.
【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】：2015
【分類號(hào)】：U448.27

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