CDS Structural Assessment & Demolition Methods Flashcards

What is the primary purpose of a demolition sequence plan?

Answer: Specify the order of structural element removal to maintain stability and worker safety

A demolition sequence plan defines the order in which structural elements are removed to control the demolition process and prevent unplanned collapse.

Robotic demolition equipment is primarily deployed:

Answer: In confined spaces or high-hazard areas too dangerous for an operator

Robotic demolition machines are deployed in confined, low-headroom, or high-hazard environments where it is unsafe to place an operator inside.

How does selective demolition differ from total demolition?

Answer: Selective demolition removes specific components while preserving the rest of the structure

Selective demolition targets specific components — walls, floors, or systems — for removal or salvage while leaving the remainder of the structure intact.

What is the key structural hazard when demolishing a post-tensioned concrete floor system?

Answer: Stored tension in steel tendons that can release violently if improperly cut

Post-tensioned tendons are under significant prestress; improper cutting can cause sudden, violent release of stored energy, posing a serious safety hazard.

In a pre-demolition structural assessment, what does a load path analysis determine?

Answer: How gravity and lateral loads are transferred through the structure to the foundation

A load path analysis traces how gravity and lateral loads flow through structural members to the foundation, informing the safe sequence of removal.

What is the primary hazard associated with demolishing older steel-framed buildings with riveted connections?

Answer: Unexpected release of residual stress causing sudden member movement or collapse

Riveted steel connections can retain residual stress, and their removal can cause sudden, unexpected movement or collapse of adjacent structural members.