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前言将园弧线作为拱的轴线线型,一般认为仅适用于小跨径的圬工拱桥或大跨径的钢筋混凝土拱桥。在“公路桥涵设计规范”第3.14条规定:“……。在一般情况下,小跨径拱圈可采用实腹式园弧拱;……”。这些认识和规定,从当前看来是值得商榷的。理论证明,在一定的矢跨比条件下,园弧线比悬链线的受力性能反而较好。本文进一步探讨园弧线与悬链线之间的关系及其变化范围;通过实例,分析园弧线代替悬链线时,验证园弧线的受力合理性及恒载内力变化情况和规律。
Foreword Park arc as the axis of arch type, generally considered only for small-span artificial arch bridge or long-span reinforced concrete arch bridge. In the “Code for Design of Highway Bridges and Culverts,” Article 3.14 states: “... In general, small-span arch ring can be used in real abdominal arched arch; ...... ”. These understandings and provisions seem to be debatable at this stage. The theory proves that under a certain ratio of sagittal span, the circular arc is better than that of catenary. This paper further discusses the relationship between arc curve and catenary and its variation range. By analyzing the arc curve instead of catenary, this paper verifies the force rationality of arc curve and the change of internal force under constant load.