Large-Span Arched Tubular Truss

A large-span arched tubular truss represents a sophisticated structural system that combines the mechanical advantages of tubular steel members with the efficient load-bearing characteristics of arched configurations.This structural solution typically spans over 40 meters,with many notable applications exceeding 100 meters in clear span.The system integrates curved steel tubes arranged in truss formations to create expansive column-free spaces ideal for various architectural applications requiring both functionality and aesthetic appeal.

Structural Characteristics and Advantages

The arched tubular truss leverages the inherent structural efficiency of arches in transferring loads primarily through axial compression,while the tubular sections provide optimal resistance to buckling and torsional forces.The closed circular or rectangular hollow sections offer excellent strength-to-weight ratios,with uniform stress distribution around their perimeter.This geometric configuration results in enhanced stability against both local and global buckling phenomena,making it particularly suitable for long-span applications.

The structural efficiency is further amplified by the arched configuration's natural load transfer mechanism,which minimizes bending moments and reduces deflection compared to straight truss systems.This system demonstrates remarkable resilience against various loading conditions,including dead loads,live loads,wind pressures,and seismic forces.The curved profile also facilitates efficient drainage when used in roofing applications,while the smooth exterior surfaces promote natural snow shedding and reduce wind resistance.

Material and Construction Considerations

Modern large-span arched tubular trusses typically employ high-strength steel grades ranging from Q235 to Q460(according to Chinese standards)or ASTM A500/A501 grades in international projects.The fabrication process involves precise computer-controlled cutting of tube ends to ensure perfect fit-up at the complex nodal intersections.Advanced welding techniques,including submerged arc welding and gas metal arc welding,ensure high-quality connections with minimal residual stresses.

Erection methodologies vary based on project requirements and site constraints.Common approaches include segmental erection using temporary supports,cantilever installation for constrained sites,and sometimes full assembly at ground level followed by lifting into position using synchronized crane operations.The construction process often incorporates sophisticated temporary works and precision surveying to maintain geometric accuracy throughout erection.

Applications and Notable Examples

Large-span arched tubular trusses find extensive application in numerous architectural domains:

Sports and entertainment venues:Arenas,stadiums,and concert halls requiring unobstructed views and large seating capacities

Transportation infrastructure:Airport terminals,railway stations,and bus terminals

Exhibition and convention centers:Facilities needing flexible,column-free spaces

Industrial buildings:Aircraft hangars,warehouses,and manufacturing facilities

Cultural and religious structures:Museums,churches,and monumental buildings

Globally recognized implementations include the roof structures of Olympic stadiums,international airport terminals,and landmark cultural buildings.These structures typically span between 60-150 meters,with some exceptional projects exceeding 200 meters in clear span.