临时固结拆除顺序对悬臂浇筑不平衡段连续梁线形和应力的影响

Study on Inf luence of Removal Sequence of Temporary Fixed Device on Alignment and Stress of Cantilever Casting Continuous Girder Bridge with Unbalanced Segment

以悬臂浇筑3跨连续梁不平衡梁段的施工为工程背景,探讨固定墩临时固结拆除顺序对浇筑不平衡梁段时连续梁变形和应力的影响。计算了连续梁边跨不平衡段浇筑前、后拆除固定墩临时固结的2种不同工况下连续梁的线形和应力,对比2种工况下施工位移和关键截面应力的计算结果,研究改变主墩临时固结拆除顺序对连续梁施工应力及线形的影响。分析结果表明:改变施工步骤后浇筑不平衡段时累计位移将会变大,但位移和应力满足要求。

The three-span continuous girder bridge with unbalanced segment was studied in this paper.The influences of removal sequence of temporary consolidation of fixed pier on deformation and stress were analyzed during the construction of the unbalanced segment.The alignment and stress of the continuous girder bridge at two stages were studied.One is that the unbalanced segment was poured,and the other is that the removal of temporary consolidation of fixed pier.The effect of removal sequence was analyzed through the comparison of displacements and stresses at key sections at these two stages.The results show that the cumulative displacements of unbalanced segment construction will increase due to the change of construction procedures,but the displacement and stress meet requirements.