某大跨度系杆拱桥的参数分析

以某大跨度系杆拱桥为背景,对系杆拱桥的内倾角、拱轴线和矢跨比进行参数分析.重点讨论了不同拱肋内倾角下拱桥受力、合理拱轴线的选择和不同矢跨比对结构受力的影响,分析结果表明拱肋内倾角对拱肋的面外稳定影响较大;拱肋内倾角度加大,横撑线刚度增强,,可以增大拱肋面外稳定安全系数;1/4L拱肋截面为拱肋控制截面,悬链线方案拱肋截面受力最好;随着矢跨比的降低,拱肋面外稳定安全系数下降.

Parametric Analysis of a Long-span Bowstring Arch Bridge

Taking a long-span bowstring arch bridge as the background, the reverse camber, arch axis and rise span ration of bowstring arch bridge are used for the parametric analysis. The stress of arch bridge under the different reverse cambers of arch rib, the selection of reasonable arch axis and the influence of the different rise span rations on structure stress are specially discussed. The analysis result shows that the reverse camber of arch rib has the great influence on the out-plane stability of arch rib. The increase of arch rib reverse camber and the enhancement of transverse bracing line stiffness can increase the safety factors of arch rib out-plane stability. The 1/4L arch rib section is the arch rib control section. The stress on the arch rib section in the catenary scheme is the best. With the reduction of rise span ratio, the safe factor of arch rib out-plane stability reduces.