How Do I Choose the Best Truss Design?

The gold truss is a structure in which the rods are hinged to each other at both ends. A truss is a flat or space structure with generally triangular elements consisting of straight rods. The truss members mainly bear axial tensile or compressive forces, so that the strength of the material can be fully utilized. When the span is large, it can save material and reduce its weight compared to the solid web beam. And increase stiffness.

A truss is a geometrically invariant structure composed of triangular frames made of straight rods. The joints between members are called nodes (or nodes). The trusses can be divided into plane trusses and space trusses according to the axis forming the truss members and the distribution of the external force. Space structures such as roof trusses or bridges are composed of a series of parallel plane trusses. If they are mainly subjected to plane loads, they can be simplified as plane trusses for calculation. ^[1]

From the perspective of mechanics, when the truss shape is similar to the bending moment diagram of the simply supported beam, the axial force of the upper and lower chords is evenly distributed, the axial force of the web member is small, and the material is most economical. From the perspective of materials and manufacturing, the wooden truss is made into a triangle The steel truss adopts trapezoidal or parallel chord shape, and the reinforced concrete and prestressed concrete truss are polygonal or trapezoidal.

The ratio of the height of the truss to the span. Generally, the three-dimensional truss is 1/12 ~ 1/16, the three-dimensional arch is 1/20 ~ 1/30, and the tensioned three-dimensional arch is 1/30 ~ 1/50. And specifications. The truss has a wide range of uses. When selecting the truss type, the truss' use, materials, support methods, and construction conditions should be considered. The principle of selecting the best form is to meet the requirements for use, and strive to manufacture and install materials and materials. The amount of labor is minimal. ^[2]

Sufficient strength-no fracture or plastic deformation occurs; sufficient rigidity-no excessive elastic deformation occurs; sufficient stability-no collapse due to a sudden change in equilibrium form; good dynamic characteristics-seismic and wind resistance.

Design requirements for truss: There must be rods that meet the requirements; there must be good connections, including rivets, pins and welds. These involve the type of truss, the size and material of the members, but first of all

The steel structure in the Wenzhou Science and Technology Museum project is divided into six units: 1. The sign tower is a steel structure tower with a height of 62.016 meters. The tower body is a pipe frame structure and adopts a spatial steel pipe structure system. 2. The roof of the middle gallery adopts a spatial steel tube structure system. Directly intersecting welded joints are used between the steel tubes. The main truss is a flat truss. 3. The roof of the North Exhibition Hall adopts a spatial steel pipe structure system. Directly intersecting welding nodes are used between the steel pipes. The main truss is a flat truss. 4. The square quadrangular pyramid grid in the South Hall's bolt ball joint. The roof is made of double laminated color steel plate. 5. Spherical grid with a diameter of 33.5 meters. 6. The steel folding canopy is H-type simple steel structure. ^[2]