Assumptions in working stress method
- The plane of section remains plane before and after bending
- Tensile strength of the concrete is ignored
- Both steel and concrete behave elastically
- Modular ratio is
σcbc: Permissible bending compressive stress in concrete
- The tensile stress can be calculated as
σt =Ft/(Ac+ mAs)
Where Ft: tensile force, Ac : Area of concrete section, m: modular ratio; As: Area of steel
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