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| Variable | Nomenclature |
|
| Stress factor |
| Concrete compressive strength (MPa) |
| h | Column depth (mm) |
| b | Column width (mm) |
| c | Depth of the concrete compressive zone (mm) |
| d | Column effective depth (mm) |
| Area of the rebar in compression (mm2) |
| Area of the rebar in tension (mm2) |
| Yield stress of the rebar (MPa) |
| Yield stress of steel (MPa) |
| Area of the steel web (mm2) |
| Area of the steel flange (mm2) |
| Yield strain |
| Concrete strain of 0.003 |
| Centroid factor |
| Yield strain of steel |
| Area of the flange in compression (mm2) |
| Fc | Compressive force (concrete) (kN) |
| Compressive force (rebar) (kN) |
| Mt | Moment contributed by the rebar in tension (kN·m) |
| Ft1 and Ft2 | Tensile force in rebars (first and second layers) (kN) |
| Ft1s and Ft2s | Tensile force in headed studs (first and second layers) (kN) |
| Moment contributed by the flange in compression (kN·m) |
| Moment contributed by the steel web in compression (kN·m) |
| Distance from the tensile rebar to the tensile flange (mm) |
| Distance from the extreme compressive layer of concrete to the compressive rebar (mm) |
| H and B | Steel width and steel depth (mm) |
| Distance from the extreme compressive layer of concrete to the compressive steel flange (mm) |
| Thickness of the steel flange in compression (mm) |
| y | Yield |
| ny | Not yield |
| P | Plastic |
| pp | Partially plastic |
| Young’s modulus of steel (MPa) |
| Thickness of the steel flange in tension (mm) |
| Thickness of the steel web in tension (mm) |
| Width of the steel flange (mm) |
| Distance from the extreme compressive layer of concrete to the first layer of the headed stud (mm) (Figure 4) |
| Distance from the extreme compressive layer of concrete to the second layer of the headed stud (mm) (Figure 4) |
| Yield strain of the rebar |
| Af and Ass | Area of the flange in tension and area of the headed stud (mm2) |
| Mc | Moment contributed by concrete in compression (kN·m) |
| Ft | Tension force (rebar) (kN) |
| Moment contributed by the rebar in compression (kN·m) |
| Mt1 and Mt2 | Moments contributed by rebars (first and second layers) (kN·m) |
| Mt1s and Mt1s | Moments contributed by headed studs (first and second layers) (kN·m) |
| Mflange | Moment contributed by the steel flange in tension (kN·m) |
| Mweb | Moment contributed by the steel web in tension (kN·m) |
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