本文選題：單索面斜拉橋　切入點(diǎn)：鋼箱梁　出處：《長安大學(xué)》2014年碩士論文

【摘要】：單索面鋼箱梁斜拉橋作為斜拉橋中較為特殊的一類，具有傳力明快、造型美觀等特點(diǎn)。隨著國內(nèi)外斜拉橋技術(shù)的不斷發(fā)展，該類橋型的數(shù)目也不斷增多。但受到其索面布置特點(diǎn)的影響，單索面鋼箱梁斜拉橋主梁的剪力滯效應(yīng)較為突出。 本文就國內(nèi)外對箱形薄壁梁剪力滯效應(yīng)的理論及試驗(yàn)研究現(xiàn)狀做了詳細(xì)介紹，隨后針對單索面鋼箱梁斜拉橋的構(gòu)造及受力特點(diǎn)，對現(xiàn)有的解析計算法和數(shù)值分析法作了比較和討論，，并以寧波市大榭第二大橋?yàn)槔ㄟ^實(shí)橋測試數(shù)據(jù)與有限元仿真計算結(jié)果相對比的方法對其主梁剪力滯效應(yīng)進(jìn)行分析。主要結(jié)論如下： 單索面鋼箱梁斜拉橋主梁的剪力滯效應(yīng)較為復(fù)雜，通過對能量變分法和比擬桿法求解過程的詳細(xì)對比，認(rèn)為比擬桿法的計算過程更為簡便。同時對三桿比擬法、能量變分法及有限元法的計算結(jié)果進(jìn)行校核，證明解析法的求解精度能夠滿足工程需要。 通過閉口加勁肋構(gòu)造尺寸的參數(shù)分析，表明閉口加勁肋對翼緣板的剪切性能及其剪力滯翹曲位移分布會造成一定程度的影響。當(dāng)閉口加勁肋厚度及高度增大時或布置間距減小時，翼緣板剪力滯效應(yīng)減弱。 鋼箱梁截面有效分布寬度會受到斜拉索集中力的影響。通過對大榭第二大橋主梁應(yīng)力的有限元分析，可知在索力的作用下主梁翼緣板有效分布寬度最多會縮小22%，在解析法計算時應(yīng)考慮該影響。 本文最后通過對大榭第二大橋施工全過程所進(jìn)行的實(shí)橋主梁應(yīng)力測試，選取主跨跨中最大懸臂施工階段、橋面鋪裝及附屬設(shè)施的安裝、成橋階段加載試驗(yàn)的實(shí)測應(yīng)力數(shù)據(jù)進(jìn)行分析，并按照各個工況所對應(yīng)的結(jié)構(gòu)體系、邊界和荷載條件進(jìn)行有限元分析。在對實(shí)測應(yīng)力值和理論計算值進(jìn)行對比后，驗(yàn)證了板殼-桿系混合有限元模型仿真分析的結(jié)果是準(zhǔn)確的。
[Abstract]:As a special kind of cable-stayed bridge, single cable plane steel box girder cable-stayed bridge has the characteristics of quick transmission, beautiful shape, etc. With the development of cable-stayed bridge technology at home and abroad, The number of this type of bridge is also increasing, but the shear lag effect of the main girder of single cable deck steel box girder cable-stayed bridge is more prominent due to the influence of the cable surface arrangement. This paper introduces in detail the theory and experimental study of shear lag effect of box thin-walled beam at home and abroad, and then aims at the structural and mechanical characteristics of single cable plane steel box girder cable-stayed bridge. The existing analytical calculation method and numerical analysis method are compared and discussed, and taking the second Bridge of Daxie in Ningbo as an example, The shear lag effect of the main beam is analyzed by comparing the real bridge test data with the finite element simulation results. The main conclusions are as follows:. The shear lag effect of the main girder of steel box girder cable-stayed bridge with single cable plane is more complicated. Through the detailed comparison between the energy variation method and the analogy bar method, it is considered that the calculation process of the analogy bar method is more convenient. The results of energy variational method and finite element method are verified, and it is proved that the accuracy of the analytical method can meet the needs of engineering. Through the parameter analysis of the structural dimension of the closed stiffener, It is shown that the shear behavior and shear lag displacement distribution of flange plate are influenced to some extent by closed stiffening ribbed rib, and the shear lag effect of flange plate decreases when the thickness and height of stiffening rib increase or the spacing decreases. The effective distribution width of section of steel box girder is affected by the concentrated force of stay cable. The stress of the main girder of Daxie second Bridge is analyzed by finite element method. It can be seen that the effective distribution width of the flange plate of the main beam can be reduced by 22% under the action of cable force, which should be taken into account in the analytical calculation. Finally, through the stress test of the main girder of Daxie No.2 Bridge during the whole construction process, the maximum cantilever construction stage of the main span is selected, and the bridge deck paving and the installation of ancillary facilities are selected. The measured stress data of the bridge loading test are analyzed, and the finite element analysis is carried out according to the structural system, boundary and load conditions corresponding to each working condition. After the comparison between the measured stress values and the theoretical calculated values, The simulation results of the hybrid finite element model of plate, shell and bar system are proved to be accurate.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441;U448.27

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本文編號：1697016