Case Studies of Composite Tubular Truss Structures

Composite tubular truss structures achieve performance optimization through the synergistic force exertion of steel and concrete. A typical example is the Shenzhen Baoan Stadium, which uses a combination of Q345B steel tubular trusses and cast-in-place floor slabs to form an 80,000㎡ large-span cantilever structure. This leverages the tensile strength of steel and the compressive properties of concrete, resulting in an overall stiffness increase of 30%. The Shenyang Olympic Sports Center innovatively combines tubular trusses with prestressed cables, using tensioned cable nets to adjust the force distribution and successfully meet the load requirements of the 2008 Olympic Games.

In special scenarios, it can be extended to hybrid structural systems. Kansai International Airport in Japan uses cast steel nodes to connect steel tubular trusses and concrete core tubes, maintaining structural integrity during a magnitude 7.2 earthquake. A stadium in Guangdong, China, uses umbrella-shaped inclined columns to support box-section tubular trusses, achieving an 85m column-free space. Cast steel components are used at the nodes to ensure reliable multi-directional force transmission. Such combined solutions balance economy and functionality, making them the preferred choice for large-span buildings.