Characteristics of grid structure

1. The grid is a network structure composed of many rods. Is a higher order statically indeterminate space structure. The grid structure can be divided into flat and curved grids.

2, the plate grid adopts more, its advantages are: space force system, rod mainly bear axial force, reasonable force, save the overall performance of the material is good, stiffness, good seismic performance. Fewer types of rods are suitable for industrial production.

3. Flat plate grid can be divided into two types: cross truss system and Angle cone system. The angular cone system has more reasonable stress and greater stiffness.

4, the height of the grid and the ratio of the short span is generally about 1/15. Steel pipe is generally used as the rod of the grid, and ball node is generally used as the node.

One, arch structure:

(1) Stress characteristics and scope of application of arch:

1. Arch is a thrust structure, its main internal force is axial pressure. The concrete with good compressive strength can be used to construct the arch structure with long span.

2. Arch structure is widely used in buildings and Bridges because of its reasonable stress. Suitable for gymnasium, exhibition hall, etc.

(2) Type of arch: arch can be divided into three hinged arch, two hinged arch and no hinged arch, the latter two kinds of arch used more.

(2) Suspension cable structure

111

(1) Suspension cable structure, one of the ideal long-span structure forms, is widely used in Bridges. The main load-bearing member of the suspension cable structure is the tension cable, which is made of high strength steel strand or wire rope.

(2) The cable tension depends on the sag in the span, the smaller the sag, the greater the tension. The sag of the cable is generally 1/30 of the span.

(3) Thin-walled space structure

(1) also known as shell structure. Belongs to the space force structure, mainly bears the axial pressure in the surface, the bending moment is very small.

(2) Thin shells are often used in large-span roof structures, such as exhibition halls, clubs, aircraft hangars, etc. The thin shell structure adopts cast-in-place reinforced concrete, which costs formwork and labor time.