开口钢箱梁的顶推工法

针对传统的钢箱梁顶推施工中因箱体自重过大而导致局部屈曲的问题,提出了无顶板的开口钢箱梁顶推施工方案.基于ABAQUS软件分析了开口钢箱梁模型在顶推过程中的应力和应变,对跨中处梁段的弯曲失稳情况进行了后屈曲分析.结果表明,开口梁顶推过程中的应力和应变均在材料的允许范围以内,结构的稳定性能够得到保证;开口梁的顶推工法能够减小钢箱梁顶推过程中箱体的自重,通过调节支承的高度可以很好地解决最大悬臂段由于起拱现象导致的支承所受应力过大的问题.

Incremental launching construction method for open steel box girder

In order to solve the local buckling problem caused by excessive box body weight in the incremental launching construction process of traditional steel box girder, an incremental launching construction scheme for the topless open steel box girder was proposed. Based on ABAQUS software, the stress and strain of open steel box girder during the incremental launching process were analyzed, and the post buckling analysis for the bending instability situation of girder segment in the mid span was performed. The results show that the stress and strain of open girder in the incremental launching process are within the allowable ranges, and the stability of the structure can be guaranteed. The incremental launching construction method for open girder can reduce the box body weight of steel box girder in the incremental launching process. Through adjusting the height of the support, the problem that the support bears too large stress due to the arching phenomenon of largest cantilever segment can be well solved.