中文摘要：

以斜靠式拱桥拱肋系为研究对象，采用弧长法，对拱肋系的侧倾失稳全过程进行了跟踪分析，获得了失稳极值点，揭示了稳定拱肋刚度，主拱肋和稳定拱肋拱顶间横撑抗弯刚度，矢跨比，主拱边界条件对极限承载力的影响规律．研究表明：斜靠式拱肋系的极限承载能力随着横撑切向抗弯刚度的增大而增大，而稳定拱肋侧向抗弯刚度和抗扭刚度对极限承载能力的影响较小；主拱边界条件和矢跨比对斜靠式拱肋系的极限荷载有明显的影响．

英文摘要：

Arc-length method is employed to investigate the system of the leaning-type arch ribs. The process of its lateral buckling is tracked and analyzed, and the extreme value point of the lateral buckling is then obtained. The impacts of stiffness of the stable arch fibs, the bending stiffness of transverse brace, rise-span ratio, the main arch boundary conditions on the ultimate bearing capacity are revealed. It is shown that： the ultimate bear- ing capacity of leaning-type arch ribs increases with the increasing tangential bending stiffness of transverse brace, while the effect of lateral bending and torsional stiffness of the stable arch ribs are so small that it is often ignored. The rise-span ratio and main arch boundary conditions have distinct impact on the ultimate bearing ca- pacity of leaning-type arch ribs system.