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When designing and constructing the space grid structure according to the regulations, in addition to complying with the relevant regulations of the regulations, it should also comply with the current relevant mandatory standards of the family.

1. Basic design regulations for grid/space frame

1) For the peripheral support grid/space frame whose plane shape is rectangular, when the side-to-length ratio (long side/short side) is not greater than 15, it is advisable to choose a square pyramid grid frame/space frame or an inclined quadrangular pyramid grid frame. /space frame, chessboard-shaped quadrangular pyramid grid/space frame, positive evacuated quadrangular pyramid grid/space frame, two-way positive oblique grid/space frame, two-way stop and orthogonal grid/space frame. When the side-to-length ratio is greater than 1.5, it is advisable to use two-way orthogonal grid/space frame, positive quadrangular pyramid grid/space frame or evacuated quadrangular pyramid grid. When the plane is narrow and long, a one-way broken line grid/space frame can be used.

2) The plane shape is a rectangle. The grid frame with three sides supporting and one side opening can be selected according to one type. The opening side must have sufficient rigidity. It can be used to increase the height of the grid frame, increase the number of layers of the grid frame, or form a complete side truss, etc. Method.

3) The plane shape is a rectangle, and the multi-point support grid can be selected according to the specific situation.

4) The plane shape is circle, regular hexagon and space frame/net frame that is close to regular hexagon and is supported by the periphery. Three-way space frame/net frame, triangular cone grid or evacuated triangular cone grid can be selected according to specific conditions. . For medium and small spans, a honeycomb triangular pyramid grid can also be used.

5) The grid height and grid size of the space frame should be determined according to the span size, column grid size, grid form, roof material, structural requirements and building functions, etc. The height ratio of the grid frame can be 1/10-1/18 . The number of grids in the short span of the space frame should not be less than 5. When determining the grid size, the angle between adjacent members should be no less than 30 degrees.

6) The space frame/grid can be supported by the upper chord or the lower chord. For example, when the lower chord is used, a vertical or inclined side truss shall be formed on the side of the support. Column caps should be provided for multi-point support grids. The cap should be placed below the lower chord plane (Figure 1a), or above the upper chord plane

7) For floors of multi-storey buildings with a span not greater than 40m and roofs with a span not greater than 60m, a combined grid structure in which reinforced concrete slabs are used instead of the upper chord can be used. The combined grid should be selected as a positive quadrangular pyramid space frame/grid, a positive evacuated quadrangular pyramid space frame/grid, a two-way orthogonal positive grid, an inclined quadrangular pyramid and a honeycomb triangular pyramid grid.

8) The drainage method of the grid roof can be used to find the slope.

A. Add a small column to the upper chord node to find the slope (when the small column is high, you must pay attention to the stability of the small column itself);

B. The height of the grid frame changes;

C. The grid structure starts from the slope

2. Basic requirements for reticulated shell structure design

1) The rise-span ratio of the spherical reticulated shell should not be less than 1/7

The thickness of the double-layer spherical reticulated shell can be 1/30~1/60 of the span (plane diameter)

The span (plane diameter) of the single-layer spherical reticulated shell should not be greater than 80m

2) The vector height of the cylindrical reticulated shell supported on four sides or along the longitudinal edge may be 1/2~15 of the span B. For the cylindrical reticulated shell supported at both ends, the ratio of the wave width B to the span L should be less than 1.0. The sag height of the complete body can be 1/3~16 of the wave width

The thickness of the double-layer cylindrical reticulated shell is preferably 1/20-1/50 of the width

The span L of the single-layer cylindrical reticulated shell supported at both ends should not be greater than 40m. The span B of the single-layer cylindrical reticulated shell supported along the longitudinal edge should not be greater than 30m.

3) The ratio of the diagonal length of the bottom of the hyperbolic parabolic reticulated shell should not be greater than 2; the sag height of a single piece of hyperbolic parabolic shell can take the span of 1/2~14 (the span is the distance between the diagonal support points), and the combination of four The sag height in each direction of the double parabolic shell can be 14~1/8 of the corresponding span.The thickness of the double-layer hyperbolic surface reticulated shell may be 1/20~1/50 of the short span

The span of the single-layer hyperbolic parabolic reticulated shell should not be greater than 60m.

4) The ratio of the bottom side to the side of the elliptical parabolic reticulated shell should not be greater than 1.5, and the sag in each direction of the shell can be taken as 1/6~1/9 of the short span.

The thickness of the layered ellipsoid parabolic blood shell may be 1/20~1/50 of the short span.

The span of the single-layer elliptical parabolic reticulated shell should not be greater than 50 m.

5) In addition to ensuring the reliable transmission of the vertical reaction force, the supporting structure of the reticulated shell should also meet the necessary edge constraints for different structural forms of the reticulated shell. The support point of the spherical reticulated shell should ensure the restraint condition against horizontal displacement

The cylindrical reticulated shell can adopt the following support methods: support at both ends, support along two longitudinal sides, and support along four sides. End supports shall have sufficient in-plane stiffness. The bearing points supported along the two longitudinal sides shall ensure restraint conditions against lateral horizontal displacement.

The hyperbolic parabolic reticulated dome shall transmit the load to the supports or substructure through the edge members. Edge members should have sufficient stiffness and be calculated together as an integral part of the reticulated shell.

The elliptical parabolic reticulated shell and the four-piece combined hyperbolic parabolic reticulated shell shall be supported along the periphery through edge members. Edge members should have sufficient stiffness.

 


Post time: Jul-20-2022