Stucture large span area

This document discusses long span building structures. It defines long span as structures with spans larger than 20m that cannot be achieved with ordinary reinforced concrete structures. It lists various loads that act on structural systems including dead, live, wind, and temperature loads. It also lists common materials that can be used for long span structures such as reinforced concrete, steel, timber, and composites. Common structural forms including insitu and precast concrete, steel structures, and portal frames are discussed. Long span structures are classified into form active, vector active, section active, and surface active systems with examples provided. Design considerations for long span beams are also mentioned, noting benefits such as flexible column-free spaces. Long span buildings create large column-Read less