Why is cutting a tendon in prestressed concrete considered dangerous?

Cutting a tendon in prestressed concrete is considered dangerous primarily because it can lead to structural failure. Prestressed concrete relies on tendons—usually high-strength steel cables or rods—tensioned within the concrete to enhance its load-bearing capacity. These tendons create internal compressive forces that counteract external loads, which is critical for the integrity and performance of the structure.

When a tendon is cut, the balance of forces within the concrete is disrupted. This can result in significant cracking, loss of strength, and ultimately the collapse of the structure if the load exceeds the remaining capacity of the concrete. The potential for catastrophic failure not only endangers the building's integrity but also poses serious safety risks to workers and occupants.

Other aspects like aesthetic value, labor costs, and construction complexity, while relevant to overall project management and economics, do not directly address the core safety concerns that arise from cutting a tendon in prestressed concrete. The primary focus in this context should be on maintaining the designed structural performance to prevent severe outcomes.