Indoor stadium structure construction analysis

The project for the school indoor play grounds stadium; Frame structure, four floors, roof space truss structure, foundation design for a class c grade, the independent foundation under column. Irregular network frame type: four pyramid space truss, the trilateral support. Drawing a total of 22, including: network frame embedded anchor tied arrangement, roof layout, rack layout, 15.200 m standard sorghum reinforcement figure, 11.700 m standard sorghum reinforcement figure, column layout and reinforcement, etc.
Now a large indoor sports venues (including basketball venues) are on top of the steel structure to support. Because indoor kids playground sports venues space span is large, and no pillar support in the middle, so generally the structure of the material do not have enough strength to bear with top quality and gravity itself, major security risk. And have enough strength can be used as the top of the structural material of steel in the most economical and practical, and so now, the top of the sports venues are basically steel frame structure. But the span of steel structure in the 60 m within the scope of security is higher, more than the span due to its own quality and gravity is bigger and bigger, will also is beyond the scope of steel to bear, so the football and track and field at the top of the only cover the stands. Open for the other part of the. Beijing\'s bird\'s nest was designed to be fully enclosed fields, then consider span is too large, the material requirements are too high, it is too big, the cost is too high, it is not sure to ensure safety, so then I gave up the idea, to open the middle.