Card Set Information
Factors that increase building collapse are:
ge of building
A structure 75-100 yrs old is reaching the end of its life expectancy
Unprotected steel bar joists fail when exposed to __-__ min of fire exposure.
Fire resistance and collapse are directly related to?
The mass of the building
What is the leading cause of death and injury to FFs?
What's the most common falling object @ a structure fire?
Residential glass is how thick?
Commercial glass can be how thick?
*8X4 window can be 40 lbs
Most FFs who die in structure fires do so how?
One at at time
content fuel + fuel in the structure
1. exterior walls run foundation to top plate
2. non bearing wall will fall 90 degree
3. bearing wall can cause floor collapse
4. fire spread from cellar to attic
what is a buttress?
an exterior wall column
what is a pilaster?
collapse of a column is more destructive than a beam collapse
Gusset plate-thickness and cutouts?
1/4" thick, cutouts 1/2" (they only penetrate a fraction of an inch 3/8")
Braced frame construction
Post and girt, held together by mortise and tennon joints
I beam components?
top and bottom flange, web in the middle
Interstitial space can be spaced how far?
what is a lintel?
Horizontal member over an opening in a wall.
structural members can withstand the greatest load when applied how?
axially-most resistant to collapse
what's a dead load
static or fixed (building and permanent equipment)
whats a live load?
transient or moveable
when timber fails, it is often at what joints?
mortise and tennon
which is strongest, platform, brace frame, or balloon contruction?
what is the safety factor of most structural elements?
2 or more
What is a terrazzo floor?
small marble chips set in several inches of cement
what is considered timber?
anything larger than 2X4
What type of wall is most likely to collapse?
what is a demising wall?
partition wall floor slab to floor slab
what type of wall will fall in a curtain fashion?
what's the collapse zone
1, 1.5, or 2X the height of the wall
What's the main problem associated with fire resistive construction?
central A/C HVAC