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文章以张承高速公路张家口段6m波纹钢圆管涵为依托工程,建立了波纹钢圆管涵有限元模型,分析了施工过程中结构的稳定性,并讨论了采用拉筋对管涵施工过程中的屈曲荷载及其变形的控制效果。结果表明:由于拉筋对圆管涵的拉力作用,减轻了其自重情况下的下挠,减小了初始变形,有利于保持管涵设计形状;随着填土高度的增加,圆管涵的屈曲荷载逐渐降低,相应的变形增加,结构的稳定性随之降低,填土到管顶附近时其稳定性最差,填土超过管顶后,土体与结构相互作用形成了土拱,屈曲荷载随填土高度的增加而增加;回填过程中加拉筋的圆管涵的屈曲荷载及其相应的变形始终小于无拉筋圆管涵,说明增加拉筋可以减小结构的变形,增加结构的稳定性。
Based on the 6m corrugated steel pipe culvert of Zhangjiakou Section of Zhang-Cheng Expressway, the paper established a finite element model of corrugated steel circular pipe culvert, analyzed the stability of the structure during the construction, and discussed the construction process of pipe culvert In the buckling load and deformation of the control effect. The results show that due to the pulling force on the round culvert, the lower torsion under its own weight can be reduced and the initial deformation can be reduced, which is in favor of keeping the design shape of the culvert. With the increase of filling height, The buckling load gradually decreases and the corresponding deformation increases, the stability of the structure decreases. When the filling is near the top of the pipe, its stability is the worst. When the filling exceeds the pipe top, the soil arches with the structure and buckles The load increases with the increase of filling height. The buckling load and its corresponding deformation of tubular cofferdams in the process of backfill are always less than that of the non-tensioned tube culvert, which shows that increasing the tensioning bar can reduce the deformation of the structure and increase the structure Stability.