考虑非保向效应的单榀拱肋系杆拱桥稳定性分析

系杆拱桥面外失稳时吊杆力的非保向效应是影响结构稳定性的重要因素,对于单榀拱肋尤为重要。考虑单榀拱肋拱脚加强钳固措施,拱肋面外侧向变形应考虑边界条件的改变。在对面外临界荷载的影响已作出研究的基础上考虑变截面的影响,同时研究非保向力的影响,引进侧向变形系数k,从而确定临界力。

Stability Analysis of Single-frame Arch Rib Bowstring Arch Bridge with Non-directional Effect

The non-directional effect of suspender force is an important factor affecting the structural stability in the outside instability of bowstring arch bridge,and especially for single-frame arch rib.Considering the strengthening clamping measures for the single-frame arch rib skewback,the change of boundary conditions should be considered in the lateral deformation of arch rib.On the basis of studying the influence on the outside critical load,the effect of variable cross section should be considered.At the same time,the effect of non-directional force is studied and the lateral deformation coefficient K is introduced so as to determine the critical force.