挂车－300荷载作用下钢筋混凝土盖板涵通用图计算与编制

摘要

Through the analysis of elementary calculation theory and internal force calculation of rein-forced concrete cover plate,the steps and contents of the calculation are introduced in detail accord-ing to the calculation parameters and the characteristics of the 300 loads.The examples are given to show a method of determining the bearing capacity of a common graph.General diagram calculation of large amounts of data and comparative analysis of calculation shows:using different span,different culvert,a different filling height,different load,the calculation of the control load is different when calculation of culvert is under -300 loads.If calculation of the culvert size is done using the trailer-300 loads,the calculated results will not meet safe passage of less than 300 trailer loads.Moreo-ver,the load effect of the large aperture culvert cover is very large.In the reinforced concrete cover culvert general map (load:Highway -IIspecial loading Trailer -300;oblique angle:0 degrees), the calculation of top filling height of 4.00m culvert is limited to the range of 0.5 ~6.0 m.It should be used in the selection according to conditions on the ground.%通过钢筋砼盖板涵基本计算理论和内力计算的分析，根据计算参数和挂车－300荷载作用的特点，介绍计算的步骤和内容，并以示例说明确定通用图基底承载力的方法。通过通用图计算的大量数据及对比分析计算表明：在挂车－300荷载作用下进行涵洞计算，不同跨径、不同涵台高、不同填土高、不同荷载，其计算的控制荷载不同。若以挂车－300荷载计算其涵洞尺寸，其计算结果将不能满足比挂车－300荷载小的某些车型安全通过；其次，特载对大孔径涵洞盖板的荷载效应影响较大，在《钢筋混凝土盖板涵通用图》（荷载：公路－Ⅱ级特载挂车－300；斜交角：0°）计算时将跨径4．00 m 涵洞的板顶填土高度限制在0．5～6．0 m 之内，应根据实地情况选用。