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明确定义∏形宽翼梁轴向受压时有效宽度与桥面板宽度之比,称之为有效宽度比,并给出其计算公式。选取n次抛物线的剪滞翘曲位移模式,基于能量变分原理,建立∏形宽翼梁轴向受压时考虑剪力滞效应的平衡控制微分方程,推导了微分方程的解及主梁横截面上任意点的应力、有效宽度和有效宽度比的计算公式。用一模型算例验证该文理论及公式的正确性,并对有效宽度及有效宽度比的影响因素作了较全面研究。
Clearly define the ratio of the effective width of the Π-shaped wide spar to the width of the bridge deck under axial compression, which is called the effective width ratio, and gives the formula. Based on the energy variational principle, a balanced control differential equation considering the shear lag effect in the case of axial compression of Π -shaped wide spar is established. The solution of the differential equation and the transverse cross- The stress, effective width and effective width ratio at any point on the cross section are calculated. A model example is used to verify the correctness of the theory and formula, and a more comprehensive study on the influencing factors of effective width and effective width ratio is made.