How to deepen the design of the exhibition truss building?

The exhibition truss structure is a relatively common structural form in steel structures, and is often used in large public buildings such as venues, stations, and airports. It has the characteristics of large span and many shapes. 

The truss structure of the exhibition is generally composed of chord rods, web rods and node plates. Due to the different materials used for structural members, there are various types of steel pipe trusses, H-beam trusses, box-section trusses, and angle steel trusses. Different types of exhibition truss structures have their own characteristics, and there are also different attention points and requirements when deepening the design.

1. Steel pipe exhibition truss

The structural member materials of the truss at the steel pipe exhibition include round steel pipes, square steel pipes and rectangular steel pipes, and the members are mostly connected by intersecting nodes. The following aspects should be paid attention to when deepening the design of this truss:

The truss members at the exhibition are mostly stressed by the axial center, and the eccentricity should be avoided as much as possible when the members are connected.

The external dimension of the main pipe shall not be less than that of the branch pipe, and the wall thickness of the main pipe shall not be less than that of the branch pipe. When the rods intersect, the large pipe shall pass through the small pipe, and the branch pipe shall not be inserted into the main pipe.

When the rods intersect, the included angle between the rods shall not be less than 30 degrees.

The connection weld between the branch pipe and the main pipe shall be continuously welded and smoothly transitioned along the entire circumference.

When multiple pipes intersect, attention should be paid to the order of intersection between the rods to ensure that each rod can be continuously welded around the entire circumference.

When the exhibition truss is produced in sections, the subsection points of the upper and lower chords need to be staggered. The butt liner is generally installed at the sectional point to ensure the quality of the butt weld. Corresponding measures should be taken to avoid the phenomenon of hindering the installation of the truss after setting the butt liner.

2.H type exhibition steel truss

H-shaped exhibition steel trusses are in the form of chords and webs, all of which are H-shaped steel or the chords are H-shaped steel, and the webs are round steel pipes, square steel pipes or rectangular pipes. In addition to paying attention to the key points of the detailed design of the steel tube truss, the following points should be paid attention to during the detailed design of the H-beam truss:

The splicing length of the flange plate of the H-beam upper and lower chord welding H-beam is not less than 2 times the plate width; the splicing width of the web plate is not less than 300mm, and the length is not less than 600mm. (If the design has special requirements, it will be executed according to the design).

The H-beam truss is butted on site, and the butt welds of the upper and lower chords cannot be in the same position, and the upper and lower staggers are greater than 200.

If the material section of the upper and lower chords of the H-beam truss needs to be cut, the cut-off position cannot be set at the node (generally, the cut-off position is set at the node in the structural design drawing). Chord butt welds.

When the H-beam truss is deepened, attention should be paid to controlling the overall size of the truss, and the overall lofting should be adopted during processing to avoid wrong sides during on-site installation.

3. Box Section Exhibition Truss

Box-section exhibition trusses are in the form of chords and webs, all of which are box-shaped, or the chords are box-shaped, and the webs are round steel pipes, square steel pipes or rectangular pipes. When the web rod is a round steel pipe, square steel pipe or rectangular pipe, the connection between the web rod and the chord rod and the web rod is mostly a continuous connection, and the attention points when deepening are the same as those of the steel pipe truss. When the abdominal chords are box-shaped, the following points should also be noted:

The butt joint of the rods needs to ensure the quality of the welding seam, and adopts the connection node form that is conducive to on-site welding. Generally, the top reserved cover plate or the side open cover plate is used.

The connection sequence of the box wall and the position of the welding seam need to consider the assembly of the stiffening plate in the box to ensure that the stiffening plate that cannot be welded by electroslag can be welded on four sides through the assembly process.

When the box-section truss web and chord are connected on site, corbels are often set at the chord nodes to simplify on-site welding and ensure welding quality.

4. Angle steel exhibition truss

Angle steel exhibition trusses are mostly used in roof structure systems, and are often used in industrial plant construction. Angle steel trusses mostly use T-shaped sections composed of double angle steels. The following aspects should be paid attention to when deepening the design:

The exhibition truss should take the centroid of the bar as the axis, the center line of the connecting bolt should be as close as possible to the centroid of the bar, and the axes at the nodes should intersect at one point to avoid eccentricity as much as possible.

When two different section materials are used for the same chord, the changing position of the section should be at the node, and the center line of the bar should coincide with the center line of the truss.

Except for the support nodes, the other nodes connected by steel plates should use steel plates of the same thickness, and the support nodes are more than 2mm thicker than other nodes.

The shape of the gusset plate is generally rectangular or trapezoidal. Usually, two sides are required to be parallel to each other, and the gusset plate generally protrudes from the edge of the angle steel by 10~15mm.

In addition to the in-depth design of the truss structure system of the exhibition truss structure building, the in-depth design of the roof and wall enclosure system is also one of the important contents.

The content and key points of the in-depth design of the enclosure system are similar to those of the door rigidity and the grid structure, and the materials used are basically the same. It should be noted that the detailed design of the enclosure system often needs to be completed jointly with the curtain wall units, and the connection method of the interface should be handled well. If the corresponding conditions are met, the connection nodes should be made in the factory as much as possible to reduce the on-site construction on the main structure. welding.

The truss structure of the exhibition has various shapes and complex structures. The shape of each project is unique. The in-depth processing of the relevant nodes by SHIZHAN Group is irreproducible. The designers use the existing technical flexibility to meet the requirements of the project. It is believed that with the passage of time, the continuous development of technology and the accumulation of experience, the key points of the in-depth design will be gathered, and the in-depth design work will provide more assistance for the convenience of construction.