Planning and Design Method of Steel Building Structure

Now, the application of steel building structure is more and more extensive. Some countries are relatively late in the planning of steel structure building, which makes the planning skill level of steel building structure far behind the developed countries. To this end, relevant planners should be down-to-earth, constantly advance and summarize the corresponding planning experience, so as to ensure that the planning of steel structure construction has a higher level of skills, thus promoting the deepening of the construction of steel structure buildings.

Planning method for steel building structure

1. Plastic planning method

When the plastic property and strength of the structural members of a building are higher than those of the members under the code load multiplied by the safety factor, the plastic planning method will generally be adopted in the analysis of the internal force structure of the members. This method has corresponding advantages. Specifically, it can allow redistribution of internal forces after its structure enters plasticity. However, it is necessary to be careful that its structure and members should have satisfactory ductility, and strictly bind the share of flange and section web according to specific needs in the planning process.

2. Allowable stress method

The allowable stress method should also adhere to the corresponding criteria in the process of planning and application. Specifically, the structural accounting stress is required to be smaller than the allowable stress specified in the structural member planning. In the stress calculation of structural members, the corresponding planning shall be carried out according to the standard load. The calculation is based on the first-order elastic theory, and the ultimate stress with a safety factor greater than 1 and with data removed may be admitted by subjecting to the stress. There are corresponding shortcomings in this planning method, which should be scientifically selected according to specific conditions in the process of application.

3. Limit state method

The presentation of limit state method can effectively deal with the shortcomings of the above two methods, and better conduct quality planning for steel structure buildings. The limit state method adopts load partial factor and resistance instead of single safety factor. Under the load effect, the structure can complete two limit conditions in the corresponding cycle, namely, the limit condition under normal operation and the limit condition of bearing capacity. The latter corresponds to the safety of the structure, specifically refers to the structural damage caused by structural cracking, plastic deformation, etc. The limit state is a widely used planning method in today's steel structure engineering planning, which can be used to improve the planning quality and ensure the stability of steel building structure.