Fig 57- Circulation: Wankhede

Area Analysis: Narendra Modi Stadium Structure and Roof Form: Narendra Modi Stadium

The structural elements of the Narendra Modi Stadium are:

1. Upper and lower bowls planned for seating 2. A podium level to enter the upper and lower bowls 3. Vomitory staircases designed for the entry and exit of the audience from the stadium 4. HY and GY Columns 5. Primary, Secondary and circumferential beams 6. Structural Steel roof

Portal Frame

Primary radial beams are supported by the GY and HY columns in the upper bowl. The lateral support to primary radial beams is provided by the circumferential beams at the column-beam joints. The force transfer mechanism between the column and beam was achieved by providing structural steel components inserted in and stretching out from the columns into pockets of the primary radial beams.

The city of Ahmedabad is located in a level 3 seismic zone because of which the roof had to be lightweight to reduce seismic demand and develop an economical roof system.

The tensile fabric roof system is seismically separate from the concrete seating bowl and supported by steel “V” shaped columns.

These columns were made to resist gravity and lateral loads that result from high winds and earthquakes. The three-tier system of the design made it crucial for the roof system to be designed accordingly. All the tiers are structurally independent, which is created with the idea that the location of the stadium is at a level three seismic zone. The roof design had to be made light in weight and had to be created separately from the bowl.

Structural Steel Roof

The structural steel roof of the stadium consists of radial cables, an inner tension ring, an outer compression ring, and a membrane. The radial cables are fully locked between the outer compression and inner tension rings.

Fig 71- Various Structural Components of Narendra Modi Stadium Source- https://theconstructor.org/case-study/sardar-patel-stadium-construction-features/452817/