An application of high strength steel tubes is presented for a 20.5 m cantilever roof structure over Salt Lake Stadium in Calcutta, having a capacity for 125 000 persons. Considering the environmental requirements, flo-coat tubes with high strength and high resistance against corrosion were selected for this stadium, which is one of the largest integrated stadia in the world. 3-dimensional analyses for this space deck using trusses, purlins, bottom runners and tetrahedron bracing elements, etc., were carried out. Troughed aluminium sheets were used on the roof. Structural arrangements had to accommodate special requirements for the lighting. Fabrication, including joint details and sequence of erection, is presented in detail. Use of high strength and thus light tubes has been found to be very effective in reducing erection time. It is concluded that the application of high strength flo-coat tubes for the stadium was ideal in reducing construction time and overall cost.
K.K. Gangopadhyay, D. Guha and P.V.N. Reddy