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介绍了梁格法的理论以及纵梁和虚拟横梁截面刚度的计算,建立了空间斜交横梁的刚度矩阵方程。利用梁格法求解恒载和移动荷载作用下不同斜交角度下横梁的内力,并与正交桥横梁内力进行对比,分析了斜交角对横梁内力的影响。结果表明,对于斜交桥边横梁,斜交角度对其弯矩值和剪力值的影响比较显著,且横梁左右两侧内力值存在较大差异,在设计中可以采用非对称形式布置横梁预应力钢束和抗剪钢筋。对于斜交桥的中横梁,斜交角度对其弯矩值和剪力值的影响不明显,横梁左右两侧内力值差异较小。在设计中可按同等条件下正交桥中横梁的布筋对称布置预应力钢束和抗剪钢筋。
The theory of beam grid method and the calculation of section stiffness of the vertical beam and the virtual beam are introduced. The stiffness matrix equation of the space skew beam is established. The internal force of the beam under different skew angle under constant and moving loads was solved by using the beam method. The internal force of the beam was compared with that of the orthogonal beam, and the influence of skew angle on the internal force of the beam was analyzed. The results show that the skew angle has a significant influence on the bending moment and the shear force for the crossbeam at the skew bridge, and there is a big difference in the internal forces between the left and right beams. In the design, the beam prestress can be asymmetrically arranged Stress beam and shear reinforcement. For the cross beam of skew bridge, the influence of skew angle on the bending moment and shear force is insignificant, and there is little difference between the left and right beams. In the design, the prestressing steel strands and the shear reinforcing steel bars can be arranged symmetrically according to the reinforcement of the crossbeams in the orthogonal bridge under the same conditions.