Chapter 4 Masonry Wall Collapse

Question 1

what are the three ways in which a masonry exterior building wall may collapse

Answer 1

1. 90° angle collapse
2. curtain fall collapse
3. inward/ outward collapse

Question 2

what is the most common type of missionary wall failure that occurs at fires

Answer 2

90° angle collapse

Question 3

Fire spreading uncontrolled through a brick and joist structure causes the collapse of all floors. The pile of compressed rubble created by the fallen interior exerts an outward or lateral force against the inside of one of the still standing brick enclosing walls…. vertical crack separation appears at the corner starting at the top and progressing downward…. this describes the cause of what type of collapse

Answer 3

90° angle collapse

Question 4

A explosion or the outward impact caused by the collapse of a roof for several floors in a progressive pancake fashion causes what type of collapse

Answer 4

inward outward collapse

Question 5

what type of collapse do you bowstring trusses cause

Answer 5

inward outward collapse

Question 6

as a general rule the collapse of Isa distance equal to the height of the wall this may be increased to 1 1/2 or twice the height of wall if…

Answer 6

if a trust roof on explosion triggers wall collapse, or if ordered by command

Question 7

which is the greater collapse hazard… a marquee or canopy

Answer 7

canopy…… a marquee is a large continuous beam supported at one end… canopy is composed of two noncontinuous beams supported at one end, if bolt cable, or connector fails it can trigger complete canopy collapse