36.3m single-slab concrete flat roof on 5,000-seat hall in Jaipur enters Guinness Book of World Records
A 5,000-seat hall in Jaipur, India, has entered the Guinness Book of Records for having the largest single-span reinforced concrete flat roof. Measuring 36.3m, the roof comprises a waffle slab that employs a criss-cross square grid of deep ribs that are supported by a perimeter beams measuring 1.4m x 2.7m supported by eight columns.
鈥淲e faced several engineering challenges while designing a structure of this size. Our major concern was to minimise the deflection, or the sagging of the roof,鈥� says Deepak Sogani, chief executive officer of NM Roof Designers, the structural engineer behind the design. This was overcome by using a 200mm-thick post-tensioned slab.
The hall is situated in the old walled city in Jaipur.
