某独柱支承连续曲梁桥侧向滑移事故处理

Treatment of Lateral Slipping of Continuous Curved Box Girder Bridge with Single Support

针对某独柱支承连续曲梁桥在护栏施工时发生支座脱空、梁体滑移事故,进行曲梁桥侧向滑移的事故原因分析。分析表明,在半径小,抗扭支座横向间距较小,扭转跨径较大时,会因施工步骤不当或活载偏载,出现支座脱空、扭转失稳现象,必须进行加固处理。本文对不同加固处理方案进行有限元分析,为曲梁桥侧向滑移加固处理提供参考建议。

To deal with an accident of the lateral sipping of a continuous curved box girder bridge with single support in the period of constructing the safety guards,the authors have analyzed the influencing factors of lateral slipping.When the curvature radius of the beam and the lateral distance between anti-torsion supports is small,but the longitudinal distance between anti-torsion supports is large,the beam would go upward at the support and the lateral slipping of the beam would take place if construction procedures are improper and the live loads are eccentrically applied.In this case,the reinforcement for the bridge is necessary.In this paper,several plans for the reinforcement and comparisons between these plans are presented.The analysis work is done with the finite element program with several suggestions.