系梁对双肢薄壁墩连续刚构桥稳定性的影响

Influence of Tie on Stability of Continuous Rigid Frame Bridge with Double Thin-wall Piers

介绍了全桥稳定性分析的基本原理,分析了高墩连续刚构桥在施工最大双悬臂和成桥运营状态下的一阶失稳模态,最后就系梁设置的数量、位置和刚度等参数对全桥一阶弹性稳定系数的影响作了详细探讨。研究结论表明100m左右的高墩设置1道系梁是较为合理的;系梁应尽量设置在墩柱的中间位置;系梁刚度不宜过大,系梁相对墩柱单肢的刚度比设置在10%~30%是较优的方案。

Tie beam setting has an important effect on the stability of continuous rigid frame bridge with double thin-wall piers.Firstly,basic principle of the stability analysis of the overall bridge is introduced.Then first order instability mode is given under the maximum double cantilever stage of construction stage and under operation status of finished stage.Finally,the influence of tie beam number,position and stiffness on first order elastic stable coefficient is discussed in detail.The research results indicate that it is reasonable to set one tie beam for high pier about 100 m,which position should be set in the middle of pier.The tie beam stiffness should not be set too large,and the ratio of tie beam stiffness to single limb stiffness set in 10% ~ 30% is an optimal scheme.Research conclusion also provides important reference for high-pier＇s tie beam design.