Model test study on integral steel structure roof of the Gymnasium of Shenzhen Universiade Sport Center

The integral steel structure roof of the Gymnasium of Shenzhen Universiade Sport Center is composed of a folded single-layer grid and an inner circular roof.A 1/10 scaled model test was conducted to provide a detailed understanding of the behavior characteristic of the structural system,reveal the weak link and failure pattern of the system,as well as verify the modeling strategy of finite element analysis.The structural characteristic,testing plan design,and analytical assumption were reported in this paper.The theoretical analysis results were compared with the testing results.Moreover,the phenomenon during the test was described and analyzed.The study reveals that the structure generally behaves linearly under the design load combination,and the measured value of displacement and internal forces are close to the analytical results.When subjected to vertical loads,the dome effect of the structure significantly influences the behavior of the folded grid as well as the inner roof.The ultimate load test indicates the ring elements are important to the entire structure,and the rupture of one ring element would lead to the change of load-transfer path,resulting unfavorable failure mode.