Structural design of steel space frame for gymnasium roof of University of Science and Technology Beijing

 Beijing University of Science and Technology Gymnasium (Judo and Taekwondo Competition Hall for the 2008 Olympic Games) is located on the campus of the University of Science and Technology Beijing. The roof span of the competition hall is 76.8m in the east-west direction and 105m in the north-south direction, and the roof span of the swimming pool is 60m in the east-west direction and 30m in the north-south direction. The lower structure (including the partial basement) system, the competition hall is a frame structure with 4 reinforced concrete small cylinders, the swimming pool is a reinforced concrete frame structure below the second-floor platform, and the steel pipe column support space frame above the platform.

Stadium with the advantages of the design of the space frame

The space frame span of the competition hall is large, and there are hanging equipment layers along the east and west sides. The gable walls at the north and south ends are hanging glass curtain walls. The total roof load is relatively large (the average load standard value is 3.66kN/m). According to its characteristics, the design adopts the form of an improved two-way positive grid, that is, without increasing the number of webs and nodes, two oblique chord systems are added to the upper and lower chord planes. It not only effectively reduces the internal force of a single rod but also adjusts the reaction force between different supports. At the same time, due to the addition of these inclined rods, the mechanical performance of the overall roof in the oblique direction is improved, and the dependence of the overall force of the grid on a single rod is reduced, which effectively improves the safety performance of the structure. To improve the rigidity of the structure and reduce the number of materials used for the main body and auxiliary structures, the design combines the requirements of roof drainage and adopts the form of a four-sided structure to find a slope, the slope is 4%, and the upper string ball node is set at the position of the ridgeline to control the shape of the roof. The thickness of the grid is 3.9 ~5.5 m. The support arrangement a

dopts the peripheral support of the lower chord, the main structure on the north and south sides is overhanging 2.775m, there are 48 column top supports, 32 beam top supports, and 4 wall top supports. By adjusting the arrangement of the upper and lower chords, a larger support reaction force is generated at the top of the column, which effectively improves the structural efficiency and safety, and avoids the excessive size of the ring beam. To match the size change of the building on the plane and avoid the intersection angle between the rods being too small, the two-way positive grid is adjusted based on orthogonality, and combined with the position of the local equipment layer hanging point, the final grid is formed. layout form.

The main structure of the competition hall uses 516t of steel. The amount of steel used is 6kg/m. The calculated deflection is 285mm (1/70 of the short span), and the pre-arching is 150mm during construction. The amount of steel used for the main structure of the swimming pool is 66t. The amount of steel used is 7kg/m. The calculated deflection is 104mm (1/88 of the short span), and the pre-arching is 60mm during construction. The grid (grid) structure has strong design flexibility. If the rods are reasonably and carefully arranged and arranged in combination with the specific characteristics of various aspects of the project, it can not only ensure the safety and applicability of the structure but also improve the aesthetics. , economic and other aspects to achieve good comprehensive benefits.

In the design of joints, special attention should be paid to special loads and temperature effects. These effects not only act on the main structure but also the displacement and deflection generated by them will also have an important impact on the stress and construction of the secondary structure and the enclosure system. , so reliable measures should be taken to deal with it in the node design. Especially in some large-scale public buildings, the building structure is complex and diverse, and on-site factors such as construction procedures will also put forward different requirements for the design, and the overall design should be considered in coordination.

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