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How to support and construct the steel structure space frame

How to arrange the support of the steel structure space frame? The support of the space frame generally includes peripheral support, point support, etc. Peripheral support is the most commonly used support form at present. It rests the peripheral nodes of the space frame on columns or beams; point support means that the space frame is placed on independent columns, and the columns have no connection with other structures.

The space frame structure generally adopts the upper chord support method. When the lower chord support is used due to building function requirements, vertical or inclined side trusses should be formed around the support sides of the space frame to ensure the geometric indeformability of the space frame and to effectively transmit the vertical and horizontal loads of the upper chord to the support.

The horizontal rigidity in the plane of the two-way orthogonal orthogonal space frame truss is small. In order to ensure the stability of each truss outside the plane and effectively transmit and distribute horizontal loads such as wind loads acting on the roof structure, the space frames around the upper chord of the space frame should be set Closed horizontal supports, for large-span structures or support around the lower chord, closed horizontal supports should be set along the space frame around the lower chord. For the multi-point support space frame, because there are too few support columns, the internal force of the rods around the columns is generally very large. Setting column caps on the top of the column can reduce the support span of the space frame, and disperse the internal force of the surrounding members of the support column, and the nodes are also difficult to handle. Therefore, it is generally appropriate to set column caps on the top of the column for multi-point support space frames. The column cap should be set under the lower chord plane, or it can be set above the upper chord plane or an umbrella-shaped column cap can be used. The form of the column cap can be combined with architectural functions (such as ventilation, lighting, etc.) to adopt different forms.  

The supporting structure of the reticulated shell, including its support nodes and edge members, is very important for the correct stress of the reticulated shell. If the required edge constraint conditions cannot be met, the requirements of the mechanical characteristics of the reticulated shell mainly bearing the membrane stress cannot be realized, and sometimes the bending internal force will be greatly increased, the internal force of the reticulated shell member will change, and even the internal force will produce a negative sign. . In addition to reliably transmitting the vertical reaction force, the supporting structure of the reticulated shell should also meet the edge constraint conditions required by different reticulated shell structures; the edge constrained components should meet the stiffness requirements, and the overall calculation should be carried out together with the reticulated shell structure.