摘要
内蒙古某(85+6×150+85)m PC黄河特大桥冬季休工期(长达6个月),恰逢主梁施工至最大悬臂状态,需验算非连续施工阶段受力状态以保证安全合龙成桥。采用计算土弹簧刚度来模拟桩—土摩阻效应,以Maxwell模型模拟墩顶新型阻尼器的墩梁位移效应,建立连续成桥和非连续成桥的线性和非线性数值模型。结果表明,与连续施工成桥相比,长悬臂施工状态休工使梁端上挠增大,主梁位移变化明显;主梁纵向最大弯矩增大,箱梁混凝土上下缘应力累积减小。
In order to evaluate the safety of bridge through the day release, the action response analysis and safety cheek is analyzed based on the yellow river bridge（85 ＋6 × 150 ＋ 85）m engineering in Inner Mongolia at the Longest Cantilever Construction Stage. This paper chooses the soil spring stiffness and Maxwell Model to simulate the pile-soil and pier-girder deformation effect respectively, and the linear and nonlinear models were also established in consideration of the damping effect. The results show that the deformation of the Longest Cantilever arms would increase obviously comparing to the continuous construction, the moment of the girder would increase and the accumulation of the normal stress on the edge of the girder would decrease.
出处
《铁道建筑》
北大核心
2012年第3期17-19,共3页
Railway Engineering
基金
中央高校基本科研业务费专项基金资助-武汉理工大学研究生自主创新基金(2010-ZY-JT-021)
关键词
大跨径梁桥
休工影响
非连续施工
箱梁挠度
箱梁应力
Large Span girder Bridge
Day release effect
Discontinuous Construction
Girder deflection
Girder stress
