交通部公路规划设计院提出的“∑法”是一种计算较简便、精度较高的连拱简化计算法,但该法尚存在墩顶弯矩计算精度不够高的缺点。本文在原方法的基础上提出了修改公式,能够在不增加很多计算工作量的条件下,显著改善了该法的这个缺点从而使“∑法”更趋完善。 The “Σ method” put forward by the Ministry of Communications Highway Planning and Design Institute is a simplified calculation method with relatively simple calculation and high accuracy, but the method still has the disadvantage that the calculation precision of the bending moment at the pier is not high enough. In this paper, based on the original method, a modified formula is proposed, which can significantly improve the shortcoming of this method without increasing a lot of computational workload, so that the “Σ method” can be further improved.