# List of Symbols

From Composite Systems

## Abbreviations, Acronyms, and Initialisms

- CFT — Concrete-Filled Steel Tube
- HT — hollow steel tube
- NA — test data not available or category not applicable for given test
- RC — reinforced concrete
- SRC — steel reinforced concrete (encased steel shape)
- CFDST — concrete-filled double skin steel tubular

## Symbols

- A
_{c}— cross-sectional area of concrete - A
_{s}— cross-sectional area of steel - D — outer diameter of circular tubes or depth (largest dimension) of rectangular tubes
- E
_{c}— modulus of elasticity of concrete - E
_{s}— modulus of elasticity of steel - F
_{y}— yield strength of steel - G
_{c}— shear modulus of elasticity of concrete - G
_{s}— shear modulus of elasticity of steel - I
_{c}— moment of inertia of concrete - I
_{s}— moment of inertia of steel - K — effective length factor
- L — member length
- M
_{no}— computed nominal bending moment capacity - P
_{no}— computed nominal axial load capacity of CFT (i.e., cross-section strength) - e — eccentricity of applied load
- e
_{x}, e_{y}— eccentricities of applied load about the major and minor axes, respectively - f'
_{c}— characteristic 28-day cylinder strength of concrete - f'
_{cc}— confined concrete strength (ksi) - t — steel tube thickness
- w
_{c}— density of concrete