# SNiP II-23-81: Steel Structures by NATIONAL CODES & STANDARDS OF RUSSIA (SNIP)

By NATIONAL CODES & STANDARDS OF RUSSIA (SNIP)

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Extra resources for SNiP II-23-81: Steel Structures

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V. ftoi we , s ,I Figure 14. Diagram of beams strengthened by lateral major stiffening ribs (1), longitudinal stiffening rib (2) which divides wall stretch to plate (3) near compression chord and plate (4) near tension chord. Strengthening by short stiffening ribs (5) is also shown. 8 with the Mowing a'Aeralions: - when walls are strengthened by lateral major stiffening ribs only, it is necessary to adopt he in formulas (75) and (81) and in Table 25 equal to double distance from the neutral axis to design (compressed) boundary of the wall stretch.

0 ?. 6 Channel, except for T. 8 rolled steel one 1 L. 85 + 019 7. 0 x, L. 1 Symbols applied in Table 27*: X is fictitious flexibility of component adopted in stability analysis at centric compression; •X 1 is fictitious flexibility of component adopted in stability analysis in the plane of moment action. No te: 1. The box sections refer to sections with closed rectangular shape (compound, formed rectangular and square ones). for box section at m > 0 shall be determined for wall which is parallel to 2.

Factor ye shall be determined according to Table 6 of this Code. 8. When the plate 3 is strengthened by additional short ribs the latter shall be continued to the longitudinal rib (Figure 14). In such case the plate 3 analysis shall be implemented by formulas (82) to (86) where the value a must be substituted by a 1 where a 1 is the distance between axes of neighboring short ribs (Figure 14). 7 b. com SNIP 11-23-81, STEEL. STRUCTURES a) b) Figure 13. Diagram of beams strengthened by lateral major stiffening ribs and longitudinal stiffening rib.