Partial safety factors ((\phi)) are used in limit state design to account for uncertainties in material properties, fabrication, and loading. The values of (\phi) vary depending on the type of load, material, and fabrication process.

Limit State Design (LSD) is a modern approach to designing steel structures, which ensures that the structure can withstand various loads and stresses without failing. S.K. Duggal, a renowned Indian engineer and author, has written extensively on the subject of steel structures, including the limit state design approach. In this feature, we will summarize the key concepts and principles of limit state design of steel structures as presented by S.K. Duggal.

The design of compression members involves checking the member against buckling and yielding.

The limit state design approach involves the following steps:

Focuses on the maximum load-carrying capacity before failure due to fracture, buckling, or overturning.

: It moves away from the older Working Stress Method (WSM) to the Limit State Method (LSM)