14 Non Fire Building Collapse Flashcards
Concerns with natural disasters
Loss of water supply. Rupture of gas mains, loss of electricity, loss of communications, impaired roads, multiple building collapse, multiple victim rescues, multiples fires from trapped flammable materials, impaired building life safety systems, arson fires, long term related fires
Buildings most susceptible to building collapse during earthquake
In reinforced concrete, buildings made prior to 1930s
Main contributing factor to damage form earthquake
Location of building relative to fault line or epicenter
Subsidence
Sinking or settling of land due to various natural and human factors such as removal of underground water or oil
Sinkhole
Natural depression in land surface formed by collapse of cavern roof general in limestone regions
Inadequate structural design collapse happens when
An inadequate design slips through inspection process or a change on made in the field that is not intended
Temporary load related collapse
When during construction phase building materials are carelessly loaded in the building and exceed the intended design load
Sequencing collapse
Improper sequencing of construction leads to failure
Weaknes of building frame collapse
Example is not letting foundation cure properly
Instability structural failure
Frame isn’t structurally stable yet and is submitted to horizontal or vertical loads, or is missing required cross bracing to strengthen it
Piecemeal demolition
Demo the building piece by piece using hand tools and machines
Controlled demolition
Using crane and wrecking ball, hydraulic pusher arms, wire role pulling or explosives
Primary goal of demolition process
Not to damage nearby properties
Vacant building or ones scheduled for demolition hazard
Scavengers removing important parts possibly weakening structure and systems leading to collapse
Two types of non fire collapse
Nature and human caused
