How to determine the height of the space frame

There are several general influencing factors: span, load, space density, etc.. If estimated, it is generally 1/15 to 1/20 of the span, and the actual experience is between 1.2-2.2 meters. Greater than 30 large span space should be calculated.

Experience about 20 meters span space frame, usually 1.4-1.8 meters common.Computer software is needed to calculate the most reasonable height. Can contact with the space frame manufacturers, they have professional designers and design software, do the design can be reasonable height.

What is the span in the space frame structure?

The span in the space frame structure refers to the distance between the two ends of the load-bearing structure in the building, between the beam and the arch coupon, and between the centers of the two pivot points.

The space frame height and space frame size should be determined according to the span size, loading conditions, column net size, bracing conditions, space frame form, construction requirements and building functions. space frame height to span ratio should be 1/18 ~ 1/10, the number of short-span space frame should not be less than 5. In determining the size of the space frame, the angle of neighboring components should be less than 45 °, and should not be less than 30 °.

The construction and installation methods of the space frame structure are divided into two categories:

One is the overall lifting method, the overall lifting method and the overall lifting method assembled on the ground.

The other is overhead bulk assembly, block assembly and overhead zipline assembly.

The cross-section of the structural members of the net frame should be determined according to the strength and stability calculation. In order to reduce the calculated length of the compression rod and improve its stability, additional re-split rods and support rods can be used. There are three kinds of nodes for steel plate space frame and steel double shell space frame, including spanning plate node, welded hollow ball node and bolted ball node. The spanning plate joint is applicable to the space frame structure with steel reinforcement, and the connection between the steel reinforcement and the joint plate adopts welding or high-strength bolt connection.

Hollow ball joints and bolted ball joints are applicable to the net frame structure of steel pipe members.

Single-layer shell space frame should be able to withstand the bending internal force, in general, the steel consumption of the nodes accounted for 15% to 20% of the steel used in the whole steel space frame structure.

The sufficient conditions for the geometry of the space frame structure to remain constant are:

1.The point is intersected by three components that are not in a plane, which is a fixed point in space, i.e. geometric invariance;

2.The triangular cone is the smallest element that constitutes the geometric invariant of the space structure;

3.The nodes of a space structure consisting of planes of triangular figures are intersections of at least three planes.