系杆拱桥设计参数讨论

On design parameters of tied arch bridge

为了明确系杆拱桥的受力特点，本文选取包括拱轴线矢跨比、梁拱刚度比两个参数进行研究，分析其对结构力学性能的影响规律。由分析可知：当梁拱刚度比在30～85之间变化时，拱肋内力值随梁拱刚度的增大而减小的幅度较大；但当梁拱刚度比在90～105之间变化时，拱肋内力值随梁拱刚度的增大而减小的程度变得相对较平缓，对于圆弧形拱肋，当梁拱刚度比较小时，此值取为0．24～0．29较为合理，

In order to explicitly specify the force characteristics of tied arch bridge, we selected two parameters such as rise - span ratio of arch axis, beam - arch stiffness ratio to investigate its impact law upon structural mechanical properties. The analysis shows that when the bean, - arch stiffness ratio varied between 30 to 85, the rate of decreases is relatively large when internal force value of the arch rib increases with the beam stiffness; when beam - arch stiffness ratio varies between 90- 105, the rate of decreases is relatively fiat when internal force value of the arch rib increases with the beam stiffness. For the arc- shaped rib, when the beam - arch stiffness ratio becomes comparatively small, this value between 0.24 - 0.29 is more reasonable.