加强圈对钢波纹板拱涵受力行为的影响研究

STUDY ON THE INFLUENCE OF REINFORCING RINGS ON THE MECHANICAL PERFORMANCE OF CORRUGATED STEEL PLATE ARCH CULVERTS

为研究大跨度钢波纹板拱涵在增设混凝土加强圈后的受力行为,建立考虑土–拱相互作用的精细化有限元模型,并与CHBDC的分析方法进行对比。在此基础上,研究加强圈承担的截面内力及其在拱脚、拱腰和拱顶等部位的分布规律,并讨论加强圈厚度、间距和宽度对拱涵力学行为的影响。研究表明:采用CHBDC方法计算钢波纹板拱涵时,轴力将被低估,其与精细化有限元计算结果的比值为0.38~0.48;钢波纹板拱涵的轴力起控制作用,加强圈使得最大轴力减小了22.14%;在拱脚位置,加强圈承担的截面轴力最大,占比50.32%;加强圈各部位的轴力贡献度与其设计参数呈正相关,增大加强圈宽度优于增加厚度和减小间距。

In order to study the mechanical performance of large-span corrugated steel plate arch culverts with concrete reinforcing rings,a refined finite element model was built,considering the soil-arch interaction,and compared with CHBDC analysis.On this basis,the cross-sectional internal force born by reinforcing rings and its distribution at the arch foot,waist and top were studied.In addition,the influence of the thickness,spacing and width of reinforcing rings on the mechanical performance of arch culverts was discussed.Results show that when the CHBDC method is applied,the axial force of corrugated steel plate arch culverts will be underestimated,and its ratio to the fine finite element calculation is 0.38 to 0.48.Due to the control of reinforcing rings over the axial force of corrugated steel plate arch culverts,the maximum axial force decreases by 22.14%.Reinforcing rings bear the maximum cross-sectional axial force at the arch foot,accounting for 50.32%.The contribution of each part of reinforcing rings to the axial force is positively correlated with its design parameters,and the effect of increasing the reinforcing ring width is better than that of increasing the thickness and reducing the spacing.