Seismic ball bearing hinge Application and Examples [seismic] ball joint seat National Stadium in Beijing's Olympic Park in the central area of ??seismic steel ball bearing hinge, floor space 80 476m2, fixed seats 1180000, activities Block 2 000 for 2008 Olympics gymnastics, handball game ball joints fixed seismic steel bearing, after the game to hold sports events and theatrical performances. Although the stadium is functionally divided into the competition hall and arena for the two parts, but roof structures in the two regions together into a whole, which uses orthogonal spatial grid structure being put in a row over the competition hall and arena for the two regions to form a continuous span structure. Space frame structure in the mesh size is 815m north-south direction bidirectional slide bearing steel ball joint seismic grid east-west direction, there are two dimensions, where the middle (between the shaft and a ○ K) mesh size of 1210m, mesh size other axis is 815m. In accordance with the building design requirements, network structure thickness between 11518 ~ 31973m. [Earthquake] does not include the ball joint bearing cantilevered structure including, plane size competition hall is 114m × 144m, larger span, in order to reduce the amount of structural steel, increased structural rigidity, give full play to the performance of the spatial structure of the force, In the lower part of the space frame structure also arranged a bi-orthogonal being put cables, cable structural steel truss masts connected through its upper part, the formation of two-way string spatial grid structure. Wherein the length of the longest mast is 91237m, cable shape according to the mast height is determined by fitting the arc. In the arena for the region, excluding cantilevered structures, structural span 51m × 63m, a smaller span, height and span space frame structures seismic activity more coordinated two-way steel ball bearing hinge, need not be disposed in the lower part of the steel truss structure Cable. Figure 2 is a structural layout. [Seismic] ball bearing hinge mounting [earthquake] on a ball joint bearing pad stone, the positional relationship between the lower part of the structure, the position of the lower structure of the coordinate system is not the same, you must first determine the coordinates. This case, the following items should be described in the design drawing on: 1 [the earthquake] linear ball bearing hinge elements arranged beams and other basic items. 2. [seismic] ball bearing hinge method of determining the origin of a small coordinate axes. 3. [seismic] ball joint bearing coordinate value of the position coordinates of the small big coordinates. When [the earthquake] ball bearing hinge installation bearing installation direction determines the direction of the upper structure must take into account the direction of movement and the direction of rotation, not the upper and lower part of the structure excessive stress. Especially for curved bridge and the bridge of hair by moving a little inconsistent with the direction of rotation, so consider bearing function, and so should be indicated on the design drawings mounting direction is extremely important. [Seismic] ball hinge support compared to traditional construction activities, green construction is an integral part of the full life cycle of green building, along with the popularity of green building concepts proposed. Green construction refers to construction, to ensure the quality and safety of the premise, the use of scientific management methods and advanced technology to maximize save resources and reduce the negative impact of construction activities on the environment, to meet the land, energy, water and materials and environmental protection as well as comfort. Green with green building construction, is built on the concept of sustainable development, is thinking is reflected in the construction of sustainable development.