Load and load combination structure bear the following main loads: 1) self weight; 2) wind load; 3) temperature load; 4) maintenance live load; 5) earthquake load.
There are three types of load combination: 1) basic combination; 2) special combination; 3) construction hoisting.
Stress analysis because the steel column is a compression bending member, its bearing capacity depends on the slenderness ratio, supporting conditions, section size and the load acting on the column. The calculation shows that the bearing capacity of steel column is generally controlled by stability.
The main beam of the superstructure can be simplified as a rigid or hinged cantilever structure on the steel column. The space parallel composite truss is formed by the beam and diagonal brace hinge between the main beams. The calculation of internal force is completed by finite element program on computer.
According to the design theory of steel structure, the strength of butt weld can reach the strength of base metal without reducing the cross section, so it is not necessary to check the weld stress, but the weld quality and plumpness should be strictly checked. The connection between upper truss members is mainly fillet weld.
The welding seam bears the stress transfer between members, and the stress magnitude has been calculated by the upper structure. For the single column billboard and other structures, the upper structure members are generally not stressed. For the convenience of welding, the welding leg size is HF = 10 mm, which can meet the requirements of the specification. However, the welding of the hanging point of the billboard panel skeleton and the main framework must be calculated one by one.
Notice of column billboard
（1） Those that affect traffic safety facilities and traffic signs cannot be set up;
（2） Those that affect the use of municipal public facilities, traffic safety facilities and traffic signs shall not be set up;
（3） Those that hinder production or people's life and damage the appearance of a city or the image of a building shall not be set up;
（4） Those that use street trees or damage green space cannot be set up;
（5） It can not be set up in the building control zone of state organs, cultural relics protection units, excellent modern buildings and scenic spots;
（6） It is not allowed to set up single column billboards in the areas where the Municipal People's government forbids the setting up of single column billboards or on carriers.
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