箱形曲线梁桥的理论分析与模型试验

THEORETICL ANALYSIS AND MODEL TEST OF CURVED BOX-GIRDER BRIDGE

用薄壁曲梁理论讨论任意约束条件下等截面曲箱梁桥内力的计算问题。根据乌曼斯基的闭口截面薄壁杆件的约束扭转理论和符拉索夫的广义坐标原理，用能量原理推导出薄壁曲线单元的刚度矩阵。并编制了专用微机程序ＤＡＣＢ，为了验证理论与自编程序的可靠性，用有机玻璃做了一个两跨双室的连续曲箱梁桥模型，并对模型作了静力实验。同时用ＤＡＣＢ程序对模型作了理论计算，其结果吻合较好。

In this pnper, the theory of curved thin-walled girder is used to analyze the internal fortce of prismatic curved box-girder bridge with arbitrary restraint conditions.According to the restrained torsion theory of thin-walled member of closed section of A.A.YmaHcHMù and generalized coordinates theory of B.B.Bxacob, I deduce the thin-walled curve element stiffness matrix with the principle of energy and write a special microcomputer program DACB in FORTRAN-77 to onalyze the curved box-girder with thin-walled curve element .In order to verify the reliability of the theory amd the program DACB, a continuous curred box girder model bridge of organic glass with two spans and two boxes is made and then a static fest, program DACB is used in theoreticl calculation of the model, their results are in good agreement.