Subject: Design and Drawing of Steel Structure

Topic: Plate Girder

Difficulty: Medium

A welded plate girder of span 25 m is laterally supported throughout and required to carry superimposed udl 100 KN/m over the entire span. The girder will not have intermediate transverse stiffeners. Design the most economical section. Provide suitable curtailment of flange plates if necessary. Also design the welded connection between web &flange plate.

Given,

L = 25m

w = 100 kN/m (Superimposed)

1) Load calculation

Total factored load on girder = 1.5x100 = 150 kN/m

Maximum bending moment = $\frac{150 \times 25^2}{8}$ = 11,718.75 kN.m

Maximum shear force = $ \frac{150 \times 25}{2} $ = 1875 kN

2) Design of web

Section classification …