Chapter 12 Stairway Collapse

Question 1

What are the three basic types of stairs

Answer 1

straight run stair
U returns stair
L-shaped stair

Question 2

collapse concerns with state straight run stairs

Answer 2

straight run stairs are supported by floor beams extending up through openings on each floor the stairs will collapse if the floor collapses

Question 3

will U return stairs collapse with floor collapse

Answer 3

as a general rule u-return stairs founded Mason Eric enclosures are independent of the floor structure and will not collapse during floor failure

Question 4

which stereotypes are built through floor openings in the center or side of the structure and depended upon the stability of the floor for support, and will collapse if the floor collapses?

Answer 4

straight run an L-shaped stairs

Question 5

what is the most serious collapse danger from u-return stairs?
what is the most frequent cause of collapse in a u-return stair?

Answer 5

intermediary lending collapse

failure of a stone stair tread or step

Question 6

flames coming from with in a wooden stair or burning wooden step may indicate what

Answer 6

serious hidden structural fire damage to the stair. stone treads on steel frame stairs may be cracked or shattered by heat

Question 7

when climbing a steel framed you return stare with stone trends a firefighter should place his foot where

Answer 7

directly over the riser and not allow the stone tread to support the weight all avoiding stepping on the intermediate landing

Question 8

stairs appear in danger of collapse what should firefighters do

Answer 8

place a ladder over the weekend stair riser and climb into the latter rungs

Question 9

intermediate landings made of stone or marble on steel frame to you return stairs most often collapse when

Answer 9

the firefighters descend the stair