Introduction to design code for structural steel
Characteristic loads
The anticipated load levels due to self weight, contents and users, snow and wind are called characteristic loads.
Classification of cross-section
Cross-sections with slender flanges or webs can be subject to distortions; this is referred to as local buckling.
Design loads
For the Ultimate Limit State, the design loads are taken as the characteristic loads multiplied by the appropriate safety factor; for the Serviceability Limit State unfactored characteristic loads are used.
Factors of safety
Safety factors provide security against collapse and allow for unavoidable differences between assumed and actual structural behaviour.
