Design Analysis of Single Layer Saddle Net for Swimming Pool of Desheng Sports Center in Shunde

Shunde Desheng Sports Center is the first time to adopt the single-layer saddle shaped cable net structure in the coastal typhoon high incidence area in China. The plane of cable net is 109 m×71 m ellipse, and the rise height of cable net is 8 m. The support system and lateral force resistance system of cable net roof steel structure are composed of peripheral V support and roof ring beam. Two high-strength sealing cables with a diameter of 65 mm and 45 mm are respectively used for the longitudinal stress cable and the lateral stability cable of the cable network structure. The ring beam is a giant rectangular beam 1 m×2 m. The roof system is a three-layer membrane system. As the saddle shaped cable net roof used for the first time in the coastal strong typhoon area, the pretension of the main cable and the secondary cable must be determined through fine shape finding and force finding, and the relative proportion of the deflection and the cable internal force under the combination of "constant load+ live load" and "constant load+ wind load" must be closely coordinated, so that the upward and downward deformation are balanced. After the structural system and form finding and force finding are preliminary determined, the detailed design of the components is carried out and the rationality of the structural scheme is verified through static analysis, stability analysis, continuous collapse prevention analysis, construction simulation analysis and large earthquake elastic-plastic analysis. The safety redundancy and construction sequence of the cable network are very important to the formation of the structural system. The nonlinear static analysis method is adopted for the cable breaking analysis in the design, and it is suggested to adopt the tensioning scheme of high-altitude sliding cable + tensioning stable cable from the perspective of engineering design. According to the stress characteristics of the structure, the surrounding V supports bear large two-way axial force and are exposed and visible. Therefore, the innovative two-way thrust bearing node is adopted to ensure the structural stress and the architectural aesthetics, and ensure the safety and redundancy of the node. The design of roof steel structure and cable structure can meet the requirements of Steel Structure Design Standard(GB 50017-2017), and can effectively realize the architectural form.