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斜交墩与正交墩受力的不同主要体现在截面刚度与弯曲正应力,通过理论分析得出斜交墩顺桥向截面刚度相对于正交墩增大,并推导了采用主惯性矩、斜交角和主轴坐标系坐标表示的斜交墩弯曲正应力公式,得到了在顺桥向弯矩作用下斜交墩截面中性轴的位置与斜交角的关系。通过对某实桥的斜交墩进行截面惯性矩计算,建立有限元模型计算弯曲正应力,对研究结论进行了验证。研究结果表明:主轴坐标系任意坐标点的弯曲正应力随着斜交角度变化而变化,且存在极值,该点应力极值对应的斜交角度仅与该点的主轴坐标系纵横坐标比值有关;矩形斜交墩(包括空心墩)顶点处最大弯曲正应力存在最不利的斜交角,并分别得到了矩形实心墩与空心墩角度的解析表达式。
The difference between the stress of the cross pier and the orthogonal pier is mainly reflected in the cross-section stiffness and the bending normal stress. The theoretical analysis shows that the cross-section stiffness of the cross pier increases with the increase of the orthogonal pier, and the main moment of inertia, Skew angle and spindle coordinate system, the formula of skew normal stress of skewed pier is obtained, and the relationship between the position of neutral axis and skew angle of skewed pier is obtained under the action of clockwise bending moment. Through calculating the moment of inertia of section of a skewed piers of a real bridge, the finite element model is established to calculate the normal stress of buckling, and the conclusion of the research is verified. The results show that the bending normal stress at any coordinate point of the spindle coordinate system changes with the skew angle, and there is an extreme value. The skew angle corresponding to the extreme point of the stress point is only related to the ordinate ratio of the principal axis coordinate system . The most unfavorable skew angle exists at the maximum bending normal stress at the vertex of rectangular skewed pier (including hollow pier), and the analytical expression of the angle between rectangular solid pier and hollow pier is obtained respectively.