Clause 7.1.2 gives the design strength of a tension member limited by yielding of the gross cross-section. This is typically the governing check for ductile tension members with adequate net section and connection detailing. The design strength is Tdg = Ag × fy / γm0.
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Key Requirements
•Design strength due to yielding: Tdg = Ag × fy / γm0
•Ag = gross area of cross-section (without deducting bolt holes)
•fy = yield stress of steel (from Table 1, corresponding to plate thickness)
•γm0 = 1.10 (partial safety factor for yielding)
•This check ensures the member does not undergo excessive elongation under factored loads
Formulas
Tdg = Ag × fy / γm0
Design strength of tension member governed by yielding of gross cross-section
Tdg = Design tensile strength due to yielding (N)Ag = Gross area of cross-section (mm²)fy = Yield stress of steel (MPa)γm0 = Partial safety factor for yielding = 1.10
Practical Notes
✓For standard sections (ISA, ISMC, ISMB), Ag is directly available from steel tables (IS Handbook SP:6). No need to calculate from dimensions.
✓For tension members with bolted connections, the gross section yielding check (Cl. 7.1.2) and net section rupture check (Cl. 7.3.2) must both be performed — the lower value governs.
✓In practice, for members with few bolt holes (1–2 bolts per row), gross section yielding often governs. For heavily bolted connections (gusset plates), net section rupture may govern.
Common Mistakes
⚠Using γm1 = 1.25 instead of γm0 = 1.10 for gross section yielding — yielding is a ductile mode, so γm0 applies.
⚠Deducting bolt holes from gross area — Cl. 7.1.2 uses gross area (Ag). Bolt holes are deducted only in the net section check (Cl. 7.3.2).
⚠Ignoring the net section rupture check — even if Tdg is adequate, Tdn may be lower and govern the design.