# Guide to designing a Rolled Steel Beam

#### Six Step Guide to Designing a Rolled Steel Beam

Here are a few simple steps that are to be followed for the design of Rolled Steel Beam:

#### Step one

Calculate the maximum Bending Moment and Shear Force

#### Step two

Depending upon whether the beam is laterally restrained or unrestrained, calculate the permissible stress in bending compression (sigma bc) using the equation;

sigma bc = 0.66fy

#### Step three

Find the required Section Modulus (Zreq)

Zreq = M/sigma bc

#### Step four

From the structural tables, choose a suitable section such that the section modulus is slightly more than the required section modulus.

#### Step five

Check for shear.

Calculate the maximum Shear force in the beam. Calculate the average shear stress in the web and this should be less than 0.4fy.

Tv = (Shear Force)/HLw

where = H = height of the web

Lw = length of the web

#### Step six

Check for deflection

Ymax < 1/325 of span

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