The design methods of steel structures mainly include seismic design methods and performance design methods. The seismic design method is designed according to the seismic code. For example, for frame structures below 50 meters and in the six-degree zone, they belong to the fifth level of seismic resistance according to the seismic code. The corresponding structural measures need to be controlled in the design to ensure that the strength stress ratio, stability stress ratio and deformation under earthquake and wind loads under small earthquake design meet the requirements of the code. The performance design method involves "low ductility-high bearing capacity" or "high ductility-low bearing capacity calculation". According to the actual situation of the project, the corresponding structural measures are relaxed to meet the requirements of the seismic code.
In addition, steel structure design also involves a variety of design methods and technologies, including safety factor method, semi-probabilistic empirical limit state method, approximate probabilistic limit state design method, full probability design method, etc. In the design process, it is necessary to focus on factors such as structure selection, steel structure layout, steel structure component design and node design. Structural selection and layout are the key to steel structure design, and it is necessary to consider the stability, seismic performance and construction feasibility of the structure. Component design and node design are important links to ensure the safety and economy of steel structures.