中文摘要：

利用有限元程序，对不同拱肋内倾角的钢管混凝土拱桥在恒载作用下的静力、稳定性以及结构的自振特性进行了计算，分析了结构位移、内力、稳定安全系数和自振频率值与拱肋内倾角的关系。结果表明：拱肋内倾角增大，有效地提高了拱桥结构的面外稳定性和横向刚度，拱肋控制截面的弯矩和拱脚的水平推力也均有大幅度的减小，当拱肋内倾角为8°时，拱脚处弯矩和水平推力均达到最小值；但拱肋内倾角在3°以下、8°以上时，对拱肋横向刚度的影响较小；结构面内稳定、面内刚度、扭转刚度及拱肋控制截面的竖向位移受拱肋内倾角的影响较小。综合静、动力学分析结果来看，拱肋内倾角以8°为宜。

英文摘要：

The static stress, stability and natural vibrating frequency of concrete-filled-steel-tube arch bridge with different arch rib leaning angles under constant load are calculated by finite element program. The relations of structural displacement, internal force, stable coefficient and natural vibrating frequency with leaning angles of arch rib are analyzed. The results show that： when the leaning angle of arch rib is increased, the structure＇s lateral stability and lateral stiffness can be increased effectively, and member moments in the middle span and horizontal force in the arch skew can be decreased greatly, and they will reach the minimum values when the leaning angele is 8°but when the leaning angle is below 3°or over 8°, to increase the leaning angle has little influence for increasing lateral stiffness; the changing of leaning angle also has little influence on arch stability, torsion rigidity and the vertical displacement of structure. The above analysis means that 8°is an appropriate value to arch rib from the views of static and dynamic mechanics. 3 tabs, 8 figs, 8 refs.