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轻型桥台自身平面内的弯曲问题通常采用Winkler地基上Bernoulli-Euler梁理论来进行分析,以对称中心的弯矩和基底应力作为最大值进行验算。考虑轻型桥台的剪切变形影响,采用Winkler地基上Timoshenko梁理论进行分析,得到了最大弯矩偏离对称中心,且比对称中心弯矩大得多;以对称中心弯矩作为最大值进行设计不安全;目前桥梁工程文献所推荐的设计验算方法值得探讨等结论。分析了最大弯矩随剪切刚度和基床系数、最大弯矩位置随襟边宽度的变化规律,探讨了以桥台基础不隆起为条件的襟边宽度合理取值问题。
Bending problems within the lightweight abutment itself are usually analyzed using the Bernoulli-Euler beam theory on the Winkler foundation, with the center of bending and base stress as the maximum. Taking the shear deformation of light abutment into account, the maximum bending moment deviated from the center of symmetry was calculated by using the Timoshenko beam theory on the Winkler foundation, and the bending moment was much larger than the symmetric center moment. The design of the center of symmetry bending moment as the maximum Safety; the current engineering design recommended bridge engineering worth checking the conclusions. The variation law of the maximum bending moment with the shear stiffness, the bed coefficient and the maximum bending moment with the width of the skirt is analyzed. The reasonable value of the width of the skirt is discussed under the condition that the abutment is not raised.