常规桥梁等截面板墩纵横向计算长度探讨

Discussion on the Longitudinal and Transverse Calculation Length of Conventional Bridges with Equal Cross-Section Panel Piers

乌拉斯沟大桥采用16×30 m先简支后连续小箱梁结构,是G331线青河(塔克什肯)至富蕴至阿勒泰段重要节点,墩高较高且墩高差异较大。论文基于受压构件的转角位移方程和欧拉公式,推导出了适用于板墩的一端固定、一端有转动和水平弹性约束构件的计算长度系数公式,并结合计算模型对该桥板墩6个方向的位移与转角变形进行分析,得到了相应的约束刚度,计算出了板墩的纵横向计算长度系数,从而实现对其进行受力计算。

Wulasigou Bridge adopts 16x30 m simple supported and then continuous small box girder structure.It is an important node of Qinghe(Takshken)to Fuyun to Altai ofG331 line,with high pier height and great difference in pier height.Based on the angular displacement equation and Euler'sformula ofthe compression member,this paper deduces theformula of calculating length coefficient for the member with fixed end,rotation end and horizontal elastic constraint.Combined with the calculation model,the displacement and angular deformation of the pier in 6 directions were analyzed,the corresponding constraint stiffness was obtained,and the longitudinal and longitudinal length coefficient ofthe pier was calculated,so as to realize the force calculation.