The type of space frame structure

 


There are many types of plane space frame structures, and there are different classification methods according to different classification indicators.

According to the structure, it can be divided into a double-layer space frame and three-layer space frame. The double-layer space frame is composed of upper and lower chords and webs; the three-layer space frame is composed of upper and lower chords plus a middle layer of chords and webs. Generally, double-layer space frames are used.

According to the different supporting conditions, flat space frames are divided into single-span and multi-span. The most commonly used is the single-span flat space frame, and its support forms include four-point support, multi-point support, and edge-point mixed support. The space frame frame supported by four points should be cantilevered, generally, 1/3 of the middle span; the continuous span supported by multi-point support should be 1/4 of the middle span, which can reduce the bending moment in the middle span of the space frame frame and improve the space frame frame. Stress performance, saving steel. There are three types of peripheral support positions: on the column, on the top of the column and on the ring beam. When the column is supported on the column, the distance between the columns can be taken as the modulus of the space frame; The space frame division is more flexible and suitable for small and medium-span space frames.

According to the different structural forms of the space frame, the flat space frame has two categories: the cross truss system and the space truss system. The plane truss system is composed of some plane trusses with parallel chords, with more rods and greater rigidity, so it has strong adaptability to buildings of various spans. The space truss system is a space truss composed of some pyramid systems. There are fewer rods, the amount of steel is economical, and the rigidity is not bad. Especially the space frame formed by removing the partial cones has fewer rods and a simple structure. , but the stiffness will be weakened, so this type of space frame is suitable for small and medium-span buildings.

The commonly used space frame structure forms are:

(1) two-way orthogonal positive space frame, two-way orthogonal oblique space frame (two-way oblique oblique space frame) three-way space frame composed of plane truss system;

(2) by four corners Cone composed of positive-placed quadrangular pyramid space frame, positive-placed evacuated quadrangular-pyramid space frame, obliquely placed quadrangular-pyramid space frame, star-shaped quadrangular-pyramid space frame, checkerboard-shaped quadrangular-pyramid space frame;

(3) Triangular pyramid network composed of triangular pyramids rack, evacuated triangular cone space frame, honeycomb triangular cone space frame.

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