摘要
箱形截面存在剪力滞效应影响,有关桥梁工程中箱梁结构剪力滞文献颇多,但均集中于箱形主梁,而对于箱形墩柱的剪力滞效应分析鲜有报道。本文基于有限梁段法,在考虑两个剪力滞位移自由度前提下,分析连续刚构桥在一般结构体系及不同施工阶段下的箱形墩柱剪力滞系数变化规律。结果表明:该方法可有效地分析连续刚构桥箱形墩柱的剪力滞效应;在一般结构体系下,当集中荷载或均布荷载作用于主梁时,箱形墩柱总体剪力滞系数分布规律一致;在不同施工阶段下,墩柱墩顶与墩底截面剪力滞系数变化明显,在中跨合龙前的顶推阶段墩顶截面剪力滞系数达到最大,至三年收缩徐变完成时,墩底截面剪力滞系数达到最大。
There have been many researches on the shear lag effect of box girder structures in bridge engineering because of the influence of shear lag effect on box cross section, but almost all of them focused on the main box girder and ignored the box-shaped pier. On the basis of the finite beam method considering two shear-lag degrees of freedom, the variation regulations of shear lag coefficient of box-shaped pier of continuous rigid frame bridge under the static structure system and the dynamic construction processes are analyzed. The results show the method is reliable when it analyses shear lag effect on box-shaped pier of continuous rigid frame bridge. Under the static structure system, the distribution regulations of the shear lag coefficient of the box-shaped pier are similar when the main box girder is subjected to concentrated or uniformly distributed loads. Under the dynamic construction processes, the shear lag coefficient of top and bottom sections of the box-shaped pier changes obviously. The shear lag coefficient of top section of pier reaches the maximum at the pushing process before the middle span is closed, and the shear lag coefficient of bottom section of pier reaches the maximum at the completion of three-year shrinkage and creep.
作者
杜逢春
DU Fengchun(The 5^(th)Engineering Co.Ltd.,of China Railway 21^(st)Bureau Group,Chongqing 402160,China)
出处
《铁道建筑技术》
2023年第2期123-125,199,共4页
Railway Construction Technology
基金
重庆市永川区技术创新与应用发展重点项目(2021yc-cxfz20004)。
关键词
连续刚构桥
箱形墩柱
有限梁段法
剪力滞效应
施工阶段
continuous rigid frame bridge
box-shaped pier
the finite beam method
shear lag effect
construction process
