FINITE ELEMENT ANALYSES OF TRUSS-TO-BOX BEAM CONNECTIONS IN STEEL FRAMES OF HEFEI XINQIAO INTERNATIONAL AIRPORT TERMINAL

摘要

Hefei Xinqiao International Airport Terminal is a steel structure consisting of long-span rigid frames,with 804m in length and about 161m in width at the widest part. The long-span frame consists of box columns,large curvature beams,tapered box beams and space trusses. The joints between space trusses and box beams named truss-to-box beam connections are the critical parts of the whole structure,because of the discontinuity in geometries and stiffness which result in high stress concentrations and complicated mechanical properties. Global structure of Section 3 of the airport terminal is modeled by ABAQUS. Structure internal forces at six load combinations of bearing capacity limit state and displacements at seven load combinations of serviceability limit state are calculated. Every structure component satisfies the stress allowance and every frame satisfies the vertical deflection limitation. For GJ3-4,GJ3-5 and GJ3-6,lower chords of the landside connections sustain large tensions,while web members of the airside connections sustain large pressures. Since these truss bars are directly connected to cover plate of the box beam,better design details are recommended to reduce the stress concentrations caused by geometrical discontinuity.