What is signified by steel supports that bow or sag?

The indication of steel supports that bow or sag is a critical warning sign of structural integrity being compromised, often pointing towards a potential collapse. When steel supports begin to deform in such a manner, it suggests that they are undergoing excessive loads or stress that they were not designed to handle. This deformation can result from various factors, including fire damage, which weakens the steel's structural strength, or improper load distribution.

In the context of firefighting and building safety, recognizing these signs is vital for ensuring the safety of both responders and occupants. A sagging support could lead to further structural failure if not addressed adequately. Thus, the presence of sagging steel supports is a clear indicator of increased collapse risk, necessitating immediate attention and a cautious approach to navigation around or within the affected structure.