上承式拱桥主拱的内力计算和初始拱轴线确定方法

Determination of Deck Arch Bridge Arch Rib Internal Load and Preliminary Design of Arch Axis

摘要: 为了对主拱拱脚位置处弹性固定在地基上的无铰拱结构进行有限元分析，需要首先确定拱固端支座发生转角位移时内力的计算公式。应用力法和弹性中心法得到了拱固端支座发生转角位移时内力的计算公式。两种计算结果基本完全一致。最后讨论了初始拱轴线的确定方法。

Abstract: For final purpose to analyse of hingeless arch which two springs are fastened in the elastic foundation by Finite Element Method, the first preliminary task is to determine internal loads at the springs of the hingeless arch induced by the foundation bearing slope angle when the hingeless arch spring is assumed as rigidly fixed in the rigid foundation. Flexibility method and elastic center method were both used to determine the internal load acted on the arch spring induced by the slope angle of the foundation bearing assumed as rigid in a same example. Results indicate that the two methods give the almost same result. Preliminary design of arch axis was discussed.