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对薄壁箱梁以畸变角和畸变挠度为位移参数的两种畸变理论进行比较分析,证明了两种理论的计算结果是完全一致的。根据箱梁的变位协调关系得出畸变挠度和畸变角的互换性,从而建立了两种理论的控制微分方程的互换方程。采用广义坐标法,明确了畸变中心的定义,确定了畸变位移模式,进而基于能量变分原理,建立了充分考虑剪切变形效应的畸变分析理论,推导了求解的初参数法,研究了剪切变形的影响。结果表明:剪切变形对畸变翘曲应力和横向弯曲应力的影响较小。
The comparison and analysis of two kinds of distortion theories of thin-walled box girder with distortion angle and distortion deflection as displacements parameters proves that the results of the two theories are completely consistent. According to the displacement coordination relationship of box girder, the interchangeability of distortion deflection and distortion angle is obtained, and the exchange equations of two kinds of control differential equations are established. Based on the generalized coordinate method, the definition of distortion center is defined, and the distortion displacement mode is determined. Based on the principle of energy variation, a distortion analysis theory that fully considers the shear deformation effect is established. The initial parameter method is deduced. The effect of deformation. The results show that the shear deformation has little effect on the distortion warping stress and the transverse bending stress.