Table 1 Design format and material strength of existing specifications.
From: Review of Design Flexural Strengths of Steel–Concrete Composite Beams for Building Structures
AISC 360-10 | KBC 2014 | Eurocode 4 | JSCE 2009 | |
|---|---|---|---|---|
Design format | Load and resistance factor design | Load and resistance factor design | Partial factor method | Partial factor method |
Design moment strength M d | M d = ϕM(f k ) | M d = ϕM(f k ) | f d = f k /γ and M d = M(f d ) | f d = f k /γ and M d = M(f d )/γ (1) b |
Resistance factor ϕ or Safety factor γ for materials | ϕ = 0.9 | ϕ = 0.9 | Concrete γ c = 1.5 Steel γ s = 1.0(2) Reinforcing bar γ r = 1.15 | Concrete γ c = 1.3 Steel γ s = 1.0 Reinforcing bar γ r = 1.0 |
Characteristic material strength f k (MPa) | Concrete 21 ≤ f ck ≤ 70 Steel F yk ≤ 525 | Concrete 21 ≤ f ck ≤ 70 Steel F yk ≤ 650 | Concrete 20 ≤ f ck ≤ 60 Steel F yk ≤ 460 | Concrete 18 ≤ f ck ≤ 80 Steel – (3) |