Following are Steps involved in the design of laterally restrained beam :
1. Calculate the total load .
Total load = dead load + live load + snow load ( if there is any)
2. Calculate the max banding moment ( M) & also the max shear force developed (V).
3. Find out the required section modulus Z(x-x).
when Z(x-x) = M / F(b)
when F(b) = Permissible bending stress assumed = 165 N / mm2.
4. From the steel tables, select a suitable section having modulus Z(x-x) slightly more than required in step 3.
5. Check the steel beam for shear stress and actual shear stress developed should not exceed the permissible shear stress = 100 N /mm2.
6. Check the steel beam for deflection. The max deflection due to applied loads should not be more than Span / 325.
If the actual deflection developed is more than the permissible limit, select another section so that moment of inertia of new section is more than section selected in step 4 and simultaneously check the Z (x-x) of the new section is more than Z (x-x) required in step 3.
