CDS CDS Structural Assessment & Demolition Methods

Question 1

What is the primary purpose of a pre-demolition structural assessment?

Accepted Answer

Identify structural systems, load paths, and potential collapse hazards

Answer

Estimate total labor costs for the project

Answer

Select recycling and waste hauling vendors

Answer

Obtain project insurance quotes from carriers

Question 2

Which demolition method uses long-boom excavators with attachments to systematically dismantle a structure from the top down?

Accepted Answer

High-Reach Mechanical Demolition

Answer

Implosion

Answer

Wrecking Ball

Answer

Hydraulic Bursting

Question 3

Wrecking ball demolition is most appropriate for:

Accepted Answer

Heavy reinforced concrete or masonry structures with adequate surrounding clearance

Answer

Structures located directly adjacent to sensitive utilities

Answer

High-rise buildings over 20 stories tall

Answer

Light wood-framed residential structures

Question 4

What is progressive collapse, and why is it a key concern during demolition?

Accepted Answer

Uncontrolled sequential failure of structural elements beyond the intended demolition zone

Answer

A planned sequence of floor-by-floor removals

Answer

A method of gradually sorting recyclable materials

Answer

The slow settling of soil after excavation

Question 5

Which structural system typically requires temporary shoring before interior demolition to prevent premature collapse?

Accepted Answer

Load-bearing masonry walls

Answer

Non-structural curtain wall cladding

Answer

Glass storefront facades

Answer

Suspended acoustical tile ceilings

Question 6

Implosion (explosive demolition) is best suited for:

Accepted Answer

Large, isolated reinforced concrete or steel structures with an adequate fall zone

Answer

Small wood-frame residential buildings

Answer

Structures immediately adjacent to occupied hospitals

Answer

Sites with a high water table and weak soils