Abstract: The emphasis of this paper is placed on the description of a series of calculating analyses of the extreme internal forces on the members of a prestressed concrete cantilever arched-truss bridge under live loads. The calculations are made by adopting the finite alement method by plane beam elements. We apply the dynamic programming to decide the use of the truck loading and carry out five different bending stiffness ratios and area ratios of upper chord's section to lower chord's section, thus the magnitude range of these ratios is found.

摘要： 本文以应用平面杆系有限元法、动态规划法加载,对拱桁桥在上弦(即桥面)与下弦的五种抗弯刚度(EJ)比和截面积(F)比的情况下,进行了活载杆件内力极值的受力分析,从而揭示出上弦与下弦杆的合理刚度比和截面积比的数值范围。