Challenge

Identification of Cracks

What is the mode of failure or damage of the beams in the figure above? Are the damages repairable? Elaborate ?

QUESTION : 1 (A)
ANSWER :
Mode of failure is given below :
It is the form of flexural failure and it is developed at the bottom of the beam shown in above picture .
this failure is occuer due to reversal of stress during earthquake .
we see that above picture the only beam failure at bottom and column is not disturbed .
During the stress reversal support top experiences copmpession and bottom experriences tension .
The top compression is managed by slab advantages as shown above picture and bottom compression is not satisfied by provided reinforcement
the reinforcement is yielded
This is non repairable

QUESTION : 1 (B)
ANSWER :
In above picture we see that the crackes are developed at beam column edges
we see that the beam is not connected to the column .
It is the beam pull out failure and such failure is occur due to insufficient developement length of reinforcement in joints.
the beam is not attached to the column .
during the earthquake the horizontal movement of structure makes this condition worse and detached the beam member from column .
if we think about repair so that we have to provide the anchorage length between two existion concrete member and it is very difficults , so that it is not repairable .

QUESTION : 1 (C)
ANSWER :
In above picture we see that the crackes are developed at the joints of column beam
the crakes in beam are developed through its entire width .
also slab is developed the more crackes
This is the plastic hinged type of failure
the major damage is occer only in joints zone
the joints can be repairable

QUESTION : 2
What is the mode of failure or damage of the beams in the figure above? Are the damages repairable? Elaborate ?

QUESTION : 2 (A)
ANSWER :
In above picture we see that concrete damage around the column faces
the above beam is safe .
in the picture the this is the column is at ground floor or basement of the building no walls are provided around the wall
this failure is occer due to soft story failure or due to plastic hinged formation .
during lateral movement the absence of infill walls the plastic hinged is formed at the top of the column .
it can be either repariable or non repairable .

QUESTION : 2 (B)
ANSWER :
In above picture the concrete developed complete brakages diagonally
the spacing of shear reinforcement is too wider and less amount of shear rebar is provided .
it is the pure shear failure
inadiquate shear reinforcement compels concrete takes all the shere stresses
it is non repariable

QUESTION : 2 (C)
ANSWER :
In above picture we see that column is completely failled
there are two slabes are connected to the one column .
It is short column failure
the failure is occur due to slab are provided at mid height it is not accoding to codel provision .
this type of failure is not repairable .

Ship work like this
in your own course.