1. The effect of changes in the cross-sectional dimensions of the truss on its internal forces

For the space triangular steel truss, once the cross-sectional height, top chord width, and spacing length are determined, the shape of the cross-section can be ascertained. With the variation of the top chord width, the internal forces within the chords remain relatively constant, but there is a significant change in deflection of the web members and the mid-span.

2. Mechanical properties of tubular truss structures

Pipe trusses are latticed structures connected at both ends with round rods. The spatial triangular steel truss exhibits the mechanical mechanism of web member shear and chord member bending under the action of uniformly distributed vertical loads. The main factor affecting the chord member axial force is the cross-sectional height.

3. Pipe truss structural calculation

Basic Design Requirements

The height of the three-dimensional truss can be 1/12 to 1/16 of the span; the thickness of the arch can be 1/20 to 1/30 of the span, and the height of the arch can be 1/3 to 1/6 of the span. The included angle between the弦 (main pipe), the web (branch pipe), and the two webs (branch pipes) should not be less than 30°.

4. Calculation Principle

Calculate the internal forces and displacements of the bucket-shaped truss structure under the action of gravity and wind loads. Additionally, displacements and internal forces under specific conditions such as earthquakes, temperature changes, support settlement, and construction installation loads should be computed. According to elastic theory, the finite element method for the space key system can calculate its internal forces and displacements.