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单室断面箱梁侨畸变计算,目前,有两种弹性地基梁法;一种以畸变角ν、另一以畸变挠度ω为参数。 本文通过对两种方法的研究,发现ν法由于构造的荷载畸变分力不符合圣维南局部影响原理的先决条件,存在某些可能的误差。用畸变角ν比拟箱梁的畸变弯曲实际上是近似的方法。导致各种刚度公式的复杂化,和物理概念不明晰;主要弱点是仅适用于矩形箱梁。与ν法比较,ω法是较为合理的。因为ω法是直接比拟法,求得弹性地基梁的挠度和弯矩,就是箱梁之值。它概念清晰,计算简捷,结果也较为准确。特别它适合于倒梯形箱梁桥。但它的弹性地丛梁的I_b公式是根据矩形梁得出的,为了改进,本文导出I_b普遍公式,它对提高倒梯形箱梁桥的畸变计算精度是有益的。
At present, there are two kinds of elastic foundation beam method; one is distortion angle ν and the other distortion deflection ω is the parameter. By studying the two methods, we find that ν has some possible errors due to the fact that the force component of the constructed load does not accord with the preconditions of the local influence principle of Saint-Venant. Distortion bending with a box girder with a distortion angle ν is in fact an approximation. Resulting in the complication of various stiffness formulas and the lack of physical concept; the main weakness is that it applies only to rectangular box girders. Compared with the ν method, ω method is more reasonable. Because omega method is a direct comparison, find the deflection and bending moment of the elastic foundation beam, is the value of the box beam. Its concept is clear, the calculation is simple and the result is more accurate. In particular it is suitable for inverted trapezoidal box girder bridge. However, the I_b formula of its elastic ground beam is derived from the rectangular beam. For the sake of improvement, this paper derives the general formula I_b, which is beneficial to improve the calculation accuracy of the distortion of the inverted trapezoidal box girder bridge.