INTRODUCTION
Steel structures are famous all around the world nowadays. There are some reasons for this and economical factors as well as easy construction with less time duration are the main reason for it. Most members in the steel structure are pre fabricated and this is saves lots of time when constructing a steel structure. Steel structures are used for many purposes and warehouses, factories and workshops are very much popular among them
In this report steel design is carried out for auto workshop which is located at Southport, Gold Coast in QLD.
The structure consist single story and length and the breath are 25.0m and 15.0m respectively.

METHOD OF ANALYSIS AND DESIGN
Frame analysis is done by using computer application S PACE GASS as well as manual calculations. S PACE GASS is a general purpose structural analysis and design program for 2D and 3D frames, trusses, grillages and beams.
Further design part is completely done by manual calculations and for this analysis and design, Australian standard for civil engineering student (HB 2.2- 2003) and the study guide for steel design are used.
3.0 PRELIMINARY DESIGN
Fig No 01: Plan view of the building
Fig No 02: Front view of the building
Fig No 03: Side view of the building
4.0 LOAD CALCULATIONS
4.1 Dead and Live Loads
4.1.1 Load by Roof Sheeting
Sheeting type: CUSTOM ORB
Thickness: 0.42 mm
Weight: 4.3 kg/m2
Area load: 4.3 x 9.81/1000=0.042 kPa
4.1.2 Load on Purling
Assume purling size: Z10012
Spacing: 1.25 m
Weight: 2.07 kg/m
Lind load due to self weight: 2.07 x 9.81/1000= 0.02KN/m
Line load on Purling by dead load
g purling= 0.042 x 1.25+ 0.02 = 0.07kN/m
Load on Purling by live load
Apurling=1.25×5=6.25 m2
1.8/6.25+0.12=0.41 kPa > 0.25 kPa (HB 2.2-2003 Table 3.2)
Line load on purling by live load = 0.41 x 1.25= 0.51 KN/m
Design load on purling
F = 1.2x gpurling +1.5x qpurling = 1.2x 0.07 +1.5x 0.51 = 0.85 KN/m
4.1.3 Load on Rafter
Size of the rafter:…