Load calculation of reinforced concrete cover of ditch

The load calculation for the reinforced concrete cover of a ditch is based on standard design principles for gutter covers. The maximum deflection, Dmax, should be less than or equal to L/200, and also not exceed 10 mm (where L is the span). The strength design of steel grating primarily involves determining the allowable bending stress [σ]. For Q235 carbon steel, the yield strength σS is 235 N/mm², and the ultimate tensile strength σb is 375 N/mm². According to Article 9.1 of the relevant standard, the allowable stress [σ] must meet the following conditions: 1. Under a design load multiplied by 1.5, the steel grating should not experience permanent deformation. 2. Under a design load multiplied by 3, the steel grating should not crack. The allowable stress [σ] is generally set at 120 N/mm² for Q235 carbon steel, which is considered appropriate under normal conditions. When the span L is small, the safety load capacity is typically governed by the strength condition. This means that the allowable bearing capacity—whether it's a uniform load Pu or a line load PL—is determined based on the allowable stress [σ]. At the same time, the deflection value should be calculated to ensure it remains below L/200, with a maximum not exceeding 10 mm. As the span increases, the deflection check becomes more critical. According to the reference data from , when the deflection D is greater than or equal to L/200, and also greater than or equal to 10 mm, the bearing capacity should be determined by stiffness conditions. In such cases, the values of Pu and PL calculated based on stiffness will certainly satisfy the strength requirements, including the bending stress [σ]. Therefore, the safety loads Pu and PL calculated using this method are in full compliance with the provisions of Article 9.1 of the standard. Additionally, there are some data issues listed in Appendix B of the YB/T 4001-1998 standard for steel grating boards. These discrepancies may affect the accuracy of certain calculations and should be carefully reviewed during design. For further details or specific technical support, you can refer to the information provided at .

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