弱横向联系变截面肋拱桥的弹性稳定计算方法研究

在肋拱桥的设计中 ,常采用弱横向联系变截面拱肋。桥涵设计规范中用组合压杆法计算临界荷载有其局限性。文章用当量压杆法推导出了实用弱横向联系变截面肋拱桥的纵向稳定临界荷载计算公式 ,并用能量法推导出了弱横向联系变截面肋拱桥的横向稳定临界荷载计算公式 ,同时考虑了拱肋的扭曲效应和矢跨比效应。这种方法计算结果更趋于准确。

Elastic stable calculating method for rib arch bridge with variable cross-section of weak transverse fixed

In the design of rib arch bridge, the arch rib of variable cross section of weak transverse fixed is adapted usually.In the paper, the practical calculating formula of the longitudinal stable critical load of the rib arch bridge which has the weak transverse fixed is deduced with the method of the equivalent compression bar.And the calculating formula of the transverse critical load of the rib arch bridge which has the variable cross section of the weak transverse fixed is deduced with the method of energy.In the calculation, the effects of rise to span ratio and torsion of arch rib are considered. In comparison with the methods of the combined compression bar in the design specification of highway and bridge, which has some limitations,the presented calcualting methods tends to more accurate resolutions.