【摘要】 本文研究运输荷载为１４０吨的五万千伏安变压器通过莆田江口石拱桥的问题。这个特大荷载在现行桥梁设计规范中是绝对不允许通过江口桥。本文采用结构极限分析了石拱桥在特大荷载下的极限承载能力，并在计算中提出利用外加荷载，调整压力线与拱轴线的偏离，明显地改善和提高石拱桥的承载能力。 本文对于挖掘现有圬工拱桥的潜力，以适应现代化建设的需要具有重大现实意义。更多还原

【Abstract】 This paper is devoted to the discussion of the problem of a 50 MVA trans- fomer (weighing 140 tons) to pass over the Jiangkou Stone-Arch Bridge of Pu- tian County. Of course, the current specifications for the arch-bridge design will allow no such load to go over it. We have applied the ultimate strength theory of structures to analyse the ultimate strength of the stone-arch and have applied the superimposed loads to regulate the coincience of the load pressure line with the arch axis. Thus, the ultimate strength of the stone-arch bridge is improved considerably. This has some immediate significance in tapping the "latent force" of old stone-arch bridges so as to meet the needs of transporta- tion for modern contructions.更多还原