1 According to the design load value ×1·5, the steel grating does not produce permanent deformation conditions, the allowable stress is [σ] 2 according to the design load value × 3, and the steel grating does not cause cracking conditions.
The allowable stress should be [σ]. In general, for 驿Q235 carbon steel, the allowable bending stress [σ] = 120N/mm2 is appropriate. When the span L is small, the size of the safety load is generally determined by the strength condition, that is, the allowable bearing capacity (including the uniform load Pu and the line load PL) is determined by the allowable stress [σ], and the deflection value is simultaneously calculated to be smaller than L/200, and the maximum does not exceed 10mm. As the span increases, the reference value for the check and calculation of the deflection value comes from: http://ShowProducts.asp?id=21 D≥L/200, when D≥10mm, the bearing capacity should be determined by the stiffness condition. At this time, the Pu and PL values ​​determined by the stiffness condition can certainly satisfy the requirements of the strength condition, that is, the bending stress [σ]. The safety load Pu and PL of the steel grating calculated by this calculation can certainly meet the requirements of Article 9.1 of the standard. 2 YB/T 4001-1998 Steel grating board standard Appendix B listed data problems.
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