新月型鋼管混凝土拱橋極限承載能力分析
[Abstract]:In order to study the influence of structural parameters on ultimate bearing capacity of crescent concrete-filled steel tubular arch bridge, the problem of extreme point stability of crescent arch bridge is analyzed based on the constitutive relation of core concrete considering constraint effect. First of all, through eigenvalue analysis, the most unfavorable load condition is obtained to the bearing capacity of the structure. Secondly, the geometric nonlinearity and material nonlinearity of the structure are considered under this condition, and the Riks method is used to solve the problem iteratively. The ultimate bearing capacity and stability safety factor of the structure are obtained. Finally, taking the Dadu River Bridge of asbestos as the engineering background, the influence of the main and auxiliary arch rib angle, the strength of steel tube material, the strength of core concrete and the steel content on the ultimate bearing capacity is studied. The results show that the instability of the crescent arch is the transverse instability of the arch rib, and the stability of the structure mainly depends on the size of dead load, and the ultimate bearing capacity decreases by 3 parts when the initial defect increases from 1% to 10% when geometric nonlinearity is considered. The ultimate load-bearing capacity is reduced by 1 / 10. After considering the nonlinearity of the material, the bearing capacity decreases by 55%; when the steel content is increased to 1.5 times, the stability safety coefficient increases by 19.0; the strength of the core concrete increases from C50 to C60. When the strength of steel increased from Q345 to Q420, the coefficient of stability increased by 9.6, and with the change of the angle of arch rib from 10 擄to 25 擄, the factor of stability decreased by 5.9%.
【作者單位】: 西南交通大學(xué)土木工程學(xué)院;
【基金】:國家自然科學(xué)基金資助項目(50978221)
【分類號】:U448.22
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