What is Soft storey & Weak Storey?

Updated: Nov 5, 2021

In this blog I will discuss about two closely related structural topics. Soft storey and weak storey. Though these are 2 different things, the situation that creates these 2 weaknesses are very similar in nature. Please also note that these two issues are the result of absence of one or two or three among the 4 virtues of seismic resistance namely good structural configuration, adequate lateral strength and adequate stiffness.

Both these terms are related to a weakness or an undesirable occurrence in a building structure. This situation is arising due to either a poor Architectural and structural scheming or sometimes due to challenging Architectural and functional requirement. What ever be the reason, these are undesirable irregularities which makes the building weak during any lateral loads like the seismic or wind load.

The best to do for a better structural performance during an earthquake is to have very regular buildings. Having said this, it is important to know what situations can create these undesirable conditions.

Soft Storey