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该文用样条有限条法导出了弯箱梁桥的应力、应变及单元刚度矩阵，推导了求一点确定内力分量的内力影响面定理，提出了等价荷载的概念，并求出了分别相应于样条结点参数及样条结点位移的等价荷载．最后编制了程序，通过静力分析和机动分析得出的影响面进行比较，说明了这种方法的正确性．
In this paper, the stress, strain and element stiffness matrix of curved box girder bridge are deduced by using the spline finite strip method. The internal force influence surface theorem for determining the internal force component is deduced. The concept of equivalent load is proposed, Equivalent load of spline node parameter and spline node displacement. Finally, the program is compiled, and the influence surface obtained by static analysis and maneuver analysis is compared, which shows the correctness of this method.