What are the design details of a steel structure building?

Many details need to be considered in the design of steel structure buildings, such as: appropriate structural damping ratio, rigid column foot design, beam and column rigid connection design, floor design and so on. Next, I will tell you the details of steel structure building design.

1. Appropriate structural damping ratio

In the whole calculation of steel structure buildings, the appropriate damping ratio should be selected, especially according to the requirements of seismic codes. Except for some special provisions, the damping ratio of the building structure shall be 0.05. The damping ratio should be considered comprehensively according to the proportion of materials used because the seismic influence coefficient of different steel structures is different. Generally speaking, the softer the overall stiffness of the structure, the lower the damping ratio.

2. Design of rigid column foot

Steel structure building common column foot embedded type, outsourcing type and bright installed type, which is more convenient for site installation and positioning. It should be noted that the stiffness of the column foot is achieved by the elastic or plastic deformation of the bottom plate. Therefore, it should be considered that when the bending moment of the bottom steel column moves down, the limit value of the interlayer displacement Angle should be rich, and the bending moment of the top of the column increases.

3. Floor design

The steel structure building has prefabricated floor slab, cast-in-place floor slab, combined floor slab and so on. If prefabricated floor slabs are used, it should be considered that they may crack at floor joints due to temperature variations and load distribution. In addition, when designing floors, attention should be paid to avoid centralized unidirectional layout and form a bidirectional load-bearing structure as far as possible.

4. Beam and column rigid connection design

Common design method or full section bending design method can be used to calculate the rigid connection between beams and columns in steel structure buildings. If the bending capacity of the flange of the steel beam is greater than 70% of the full section capacity, the ordinary design method can be used. If less than 70%, the full section bending design method should be adopted.

There are many factors to consider in the design of steel structure buildings, and each link is very important, so we must pay special attention to the above details in the construction.