Whole Process Analysis of the Prestressed Construction of the Spoke-Type Cable-Truss Structure of Xiamen New Sports Center Stadium

In recent years, with the continuous emergence of a variety of new long-span spatial structure forms and their wide application in large public buildings, on-site prestressed construction is facing considerable challenges. Through a simple combing of the current prestressed tensioning construction process simulation methods, combined with specific engineering examples, the whole process of prestressed construction of the spoke-type cable-truss structure of Xiamen New Stadium was analyzed. Xiamen New Sports Center Stadium, also known as Bailu Stadium, has a construction area of 180 600 square meters. It is expected to be used as a football stadium for the 2023 Asian Cup. It is composed of north-south giant arches, inner ring trusses, peripheral trusses, orthogonal positive connection grids and a saddle-shaped spoke-type cable truss structure in the center of the shed. The spoke-type cable truss structure is composed of 40 groups of cable trusses and ring cables. The length of the steel roof is 326 m from east to west, and 350 m from north to south. The plane projection is an ellipse of 143 m×95 m, and the space is saddle-shaped. The maximum elevations on the east and west sides of the canopy are 77 m and 85 m respectively, and the maximum elevations on the north and south sides are 24 m and 32. 5 m respectively. It is the stadium structure with the largest height difference in China. The radial cables of the cable truss structure are anchored on the connection grids between the giant arch structure and the giant arch. In view of the complex structure, the enormous volume of the cable system, the large height difference of the saddle surface, and high synergy of the overall lifting and synchronous tensioning of the novel structural system, a five-stage lifting scheme of the spoke-type cable-truss structure was innovatively proposed, whose core steps were as follows:low-altitude assembling-traction lifting-batch anchoring-steel brace hoisting-high-altitude tensioning. Then, the LS-DYNA dynamic analysis software was used to carry out numerical simulation of the whole process of prestressed cable construction. Through the division of working conditions, the construction simulation check calculation was carried out for the lifting stage, the steel diagonal brace installation stage, the upper radial cable anchoring stage and the tensioning stage, and compared with the results of the design stage to verify the operability of the five-stage lifting scheme. The construction forming scheme of the saddle-shaped spoke-type cable structure of Xiamen New Sports Center Stadium with large height difference showed that:the simulated value of the displacement deformation and the cable force cloud image basically coincided with design values; Compared with the traditional lifting scheme, the five-stage lifting scheme had certain advantages in terms of safety, quality, temporary design and schedule control; the simplicity and convenience of form-finding analysis, force-finding analysis, and load analysis through finite element software still had room to be greatly improved; the development of integrated interactive analysis software for dynamic simulation of the construction process could provide stable technical support and broad application prospects for the whole process of prestressed cable structure construction.