Tube Truss in Transportation Hubs

Structural Design and Construction
Tube trusses in transportation hubs utilize spatial truss systems, such as the 20 fish-belly tube trusses with a length of 52 meters at Dalian North Railway Station. High-precision assembly is achieved through inverted triangular spatial truss support devices, solving construction challenges in confined spaces. The members are primarily subjected to axial forces, resulting in uniform stress distribution and high material utilization, making them suitable for large-span coverage.

Node Innovation and Material Optimization
Nodes adopt cast steel hinges or intersection line welding, such as the connection between the main truss and side truss of a gymnasium in Guangdong, which releases bending moments and reduces welding stress through multi-planar node design. Steel pipe specifications are diverse (maximum d245×20), and the height-to-width ratio of the cross-section is controlled at 2:1, balancing rigidity and economy.

Application Advantages
Tube truss structures are lightweight and aesthetically pleasing, and can adapt to curved shapes (such as elliptical roofs), while reserving space for equipment pipelines and reducing building height. Its modular construction shortens the construction period, such as the seamless integration of the 11,500 square meter skylight and transportation functions at Dalian North Railway Station.