混凝土弯箱梁桥正应力放大系数的讨论

Discussion on Normal Stress Amplification Coefficient of Concrete Curved Box Girder Bridge

由于弯扭耦合作用,曲线桥梁的非偏心荷载(如自重)会产生约束扭转翘曲正应力。论文推导了梯形悬臂板双室箱形截面主扇性惯性矩的公式,并通过算例验证公式的正确性,同时结合算例分析自重作用下曲率半径的变化对曲线桥梁正应力放大系数的影响。

Due to the coupled action of bending and torsion, the non eccentric load(such as self weight) of curved bridge will produce restrained torsional warping normal stress. In this paper, the formula of the moment of inertia of the main sector of the double chamber box section of trapezoid cantilever plate is derived, and the correctness of the formula is verified by a calculation example. At the same time, the influence of the change of curvature radius on the normal stress magnification coefficient of curved bridge under the action of self weight is analyzed by combining with the calculation example.