Pre-Engineered Steel Buildings use a combination of built-up sections, hot rolled sections and cold formed elements which provide the basic steel frame work with a choice of single skin sheeting with added insulation or insulated sandwich panels for roofing and wall cladding. The concept is designed to provide a complete building envelope system which is air tight, energy efficient, optimum in weight and cost and, above all, designed to fit user requirements. It can be used to provide mezzanine floors, Canopies, Overhead Cranes, fascia’s etc. They are supplied as a fully finished product along with steel structure, roofing, cladding and building accessories. They require no on-site fabrication or welding – they can simply be bolted together as per specifications. It got the ad together as per specifications. It got the advantage of consistent quality control, durability, faster delivery, aesthetic beauty etc. PEB buildings are ideal for Warehouses, offices, Shopping Malls, Metro stations, Schools, Factories etc. PEB’s are most recommended for wide span low rise buildings.
A Space Frame or Space Structure is a truss like, light weight rigid structure constructed from interlocking struts in a geometric pattern. Space frames usually utilize a multidirectional span, and are often used to accomplish long spans (up to 100 m) with few supports. Space Frames are excellent in resisting the loads in different angles; due to the three dimensional inter connectivity of members and continuity of the truss in the three dimensions. To utilize the maximum structural advantage of the space truss technology, continuous members are used as bottom and top chord members, joined together with the diagonal members. Space Frames are ideal for use in Shopping Malls, Food Court, Transport Terminals, indoor stadiums, Convention centers, Warehouses, factories, Centre Courtyards etc.Space Frames are most recommended for large span structures with minimum columns, Cantilever structures, structures with inbuilt roof drainage and cat walk, structures with irregular supports or concentrated loads etc.
Structures with hollow sections are more economical and stronger than conventional rolled sections. Large radius of gyration compared to unit weight of a member, the tube has the largest possible value, which makes the tubular sections most cost effective. The advantages of tubular sections are low maintenance, speedy construction, flexible layout, inherent resistance to earthquake etc.
The principal structural elements of a typical multi-storey building are the floors, beams, columns and foundations. Minimum foundation is required for a steel building which can be either isolated footings or pile foundations. Columns and beams are fabricated from Hot Rolled Plate sections. Floors can be made by composite Trapezoidal profiled decking sheets.The elements of steel building are usually prefabricated in the factory under effective quality control thus enabling a better product. The steel frame construction is more suitable to withstand lateral loads caused by wind or earthquake.Steel buildings have 20 to 30% reduction in construction time relative to site-intensive construction, depending on the scale of the project.Site management costs can be reduced by 20 to 30% which can lead to a 3 to 4% saving in terms of overall building cost.Steel construction is less than half the weight of an equivalent concrete structure, which is equivalent to a 30% reduction in overall foundation loads.Long span steel construction provides more flexible use of space, which depends on the function of the building and its future uses.