Design of steel columns and supports
1. Outline of frame column design
Column section form: box shape, welded I-shape, H-shape steel, round pipe, etc
Section estimation: According to 1.2N axial compression members, 3~4 layers for a cross-section change, the thickness should not exceed 100mm
Plate width to thickness ratio, see table below
Slenderness ratio: Multi-layer (£12 layer) frame column should not be greater than 120 when 6 to 8 degrees of defense, and should not be greater than 100 when 9 degrees of defense. When the fortification intensity is 6,7, 8 and 9 degrees, the height of the tall (>12 stories) frame column is 120, 80 and 60, respectively
The "Technical Regulations for Steel Structures in high-rise Civil Buildings" (JGJ99-98) stipulates that: when calculating the stability under the combination of gravity and wind or earthquake loads, if the standard value of inter-story displacement does not exceed 1/250 of the height of the frame column, the calculated length coefficient of the frame column with support (or shear wall) can be m=1.0; When the standard value of interstory displacement does not exceed 1/1000 of the height, the calculated length coefficient of pure frame column can also be calculated by Wu's lateral displacement formula.
GB50017 for supported frame is divided into strong supported frame and weak supported frame.
2, column and beam connection
★ Common form: rigid connection
★ Fully welded
★ Fully bolted
★ Bolt welding mix
★ Improved form completely welded: bone joint (Dog bone), beam end with axils, cantilever beam segment
★ Flexible connection form: connecting Angle steel, end plate, support
★ Semi-rigid connection: end plate - high strength bolt connection mode, upper and lower Angle steel and high strength bolt mode
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