Abstract：
The main steel structure of National Indoor Stadium's roof is a large stepped arc shell, and its frame consists of top chord pipe beam, bottom chord square steel beam and cable support and etc while the beam and truss are connected by steel pipe rods and sway rods. Due to its good performances in energy-saving, wind resistance and fire resistance, the metal roofing system, when successfully used in the National Gymnasium Project, presented advantage in respects of wind resistance and rain resistance, being fully accepted by all relevant parties.
