The single-layer reticulated shell needs to be made into a rigid rod system. The joints and the rods need to bear the bending moment in addition to the axial force, which is the biggest difference from the grid structure. However, when the force is large and the span is large, in order to prevent the surface from being unstable, it is preferable to form a double-layer net shell. The double-layer net shell is a dumpling rod system like a net rack.
The load-bearing structural system consisting of the tensioned steel cable and the supporting steel cable member is called a suspension cable structure. The most outstanding advantage of the suspension cable structure is that the steel cable used only bears tensile force, which can fully exert the performance of high-strength steel, thereby saving steel, reducing the weight of the roof and effectively covering large-span buildings.
The suspension cable structures commonly used on roofs can be divided into four categories according to their composition, namely single-layer suspension cables, double-layer suspension cables, lateral reinforcement cables and cable nets. The construction of the suspension cable structure requires attention to two major problems. One is to enhance the rigidity of the roof, and the other is to effectively transmit the tension of the cable.
The method of reinforcing the rigidity of the roof is to use pre-stressing; the pulling method of the transmission cable adopts the pillar and the ground anchor, and the side frame or the stand of the building is utilized, and the most effective way is to make the edge member of the building roof into a closed shape, such as Round, elliptical shape, etc., the tension of the chord is balanced by itself in the edge member.
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