Design of Steel Industrial Shed Using STAAD.PRO

Steel industrial sheds are widely used for factories, warehouses, workshops and storage facilities because they can provide large column-free floor areas and can be erected quickly. This study presents the analysis and design of a single-bay steel industrial shed using STAAD.Pro, following the limit state provisions of IS 800:2007 and the load provisions of IS 875 (Parts 1 to 3). The shed has a clear span of 20 m, a length of 48 m with bays of 6 m, and an eave height of 8 m, and it is assumed to be located on the outskirts of Hyderabad in open terrain. The roof is supported by steel trusses of the Pratt type resting on built-up or rolled steel columns, and the roof covering consists of galvanised profiled sheeting carried on cold-formed purlins. Longitudinal stability is provided by bracing in the roof plane and in the end bays of the side walls. The complete three-dimensional structure, including trusses, columns, purlins, eave struts and bracing members, is modelled in STAAD.Pro so that the interaction between frames and the distribution of wind forces through the bracing system are represented properly. Dead load from sheeting, purlins and self-weight, imposed load on the roof as per IS 875 (Part 2), and wind load as per IS 875 (Part 3):2015 are considered. For wind load, the basic wind speed of 44 m/s is modified by the risk coefficient, terrain and height factor, and topography factor to obtain the design wind pressure. External and internal pressure coefficients are applied for the cases of wind parallel and perpendicular to the ridge, with both positive and negative internal pressure. Load combinations are generated according to IS 800:2007, including the combination of dead load with wind uplift, which usually governs the design of the roof members. The analysis provides the axial forces in truss members, the bending moments and shears in columns, the support reactions and the lateral deflection at the eave level. Steel sections are then designed and checked in STAAD.Pro for tension, compression, bending and combined actions using the IS 800:2007 design module. Member sizes are revised iteratively until all members satisfy the strength ratio and slenderness limits, and the eave deflection is kept within the serviceability limit of height divided by 150 for sheds with elastic cladding. The study shows that the wind uplift combination governs the design of the top chord and several web members of the truss, where members designed mainly for compression under gravity load experience reversal of force. The final design gives a steel consumption of about 24 kg per square metre of plan area, which is comparable with typical values for sheds of this span. The work demonstrates how STAAD.Pro can be used to obtain an economical and code-compliant design, and it can be extended to pre-engineered building frames, crane-supported sheds and comparative studies of different truss configurations.