Pre-Engineered metal Buildings (PEB) are the most efficient and economical solution for the fastest construction of single-storey industrial building having less column free areas. PEB is the better framing solution for the structure whose span length less than the 30 meters. For the spans over 30 – 80 meters the cost of construction will increase adequately because of member properties of the structure.
The main advantages of the PEB are faster erection, minimal maintenance and possibility of expansion of structure. The hangar structure having 73.8 meters clear span, 10 bays of each 8.48 meters length and 22 meters height to accommodate 19 meters height aircraft was designed and erected with the help of Pre-Engineered building in Mumbai airport, India (1). The Figure 4 shows the lattice frame roof structure for the large span single storey industrial building for coal storage purpose. This coal storage shed having 60 meters clear distance between the column in width direction and a length of 100m. Lattice frame are more suitable under gravity loads on roof structure. These frames are having high stiffness against deflection of the roof structure. Lattice frame also used for the structures having hanging loads from the roof structure. Lattice trusses are more expansive than portal frames for the small span structures, generally these trusses can have supported on either steel or concrete columns (2). The hangar structure shown in the Figure 5 is constructed for maintenance purpose of two Boeing 747-400 type aircrafts for Air India at Mumbai, India (3). The detailed dimension of this aircraft type is mentioned in the Table 1 of page 3 in this document. The required clear span and length of hangar structure to accommodate two aircrafts of type 747-400 are minimum of 130 meters and 90 meters respectively. Because of large column free area, the deflection of structure as well as overall rigidity of structure is extremely important and the hangar roof structure should carry the vertical hanging loads from all types of docking system. By considering all these principal factors the hangar structure roof is constructed with the help of space truss system. Space Frame is a structural system, assembled of linear elements so arranged that the loads are transferred in a three-dimensional manner (3). Space Frames are rigid joint structural system whereas space trusses are pin-jointed structural system. The Space truss is more economical structural system to cover large column-free spaces. The deflections of the structural roof system are in limit because of high stiffness of space trusses. The construction time of space tresses are saved by using factory-produced components. All the structural components used to construct space truss are circular hallow members and the dead loads are very much less. This helps to saving the material in column and substructure members.