Identification of Cracks

Question 1:

a) 

b) 

 c) 

What is the mode of failure or damage of the beams in the

figure above? Are the damages repairable? Elaborate

 

 

ANSWER-

 

OBSERVATION -

This type of failure occur at bottom to top .

and this faiure looking deep , in there 

structure .

--and RCC comes in contact of Air .

AND  also  increase chances of Corrosion .

 

conclusions -

-it is a form of flexural failure .

-this failure occur due to reversal 

stress of earthquake .

-when  earthquake comes , in here 

upper part of beam is connected to 

slab , so slab provide protection of 

upper part of beam ,

-but lower part didnot overcome 

these reversable stress effect so 

this type failure are take place in 

here .

-and Reinforcement seems not 

yielded , 

-and permanant and nonrepairable 

deformation comes in here .

 

 

 

B)

OBSERVATION -

-

-Shown in here big and deeper crack .

-in here seems to beam is seprated 

to column and also deformed .

-and feel like reinforcement is helps 

to hold that structure .

-

CONCLUSION -

-When seismic force act, than beam try 

to pull themselves out of beam ,

due to less devlopment length  , 

provided  over in here , so structure fail.

-this failure occured due to very less 

devlopment length of RCC  bars 

-less devlopment lenth and  cracks 

are wide , open  so structural is non 

repairable .

 

 

 

 

C]

OBSERVATION -

-CRacks observed whole beam width 

and column 

-and cracks observed at joint .

 

 

CONCLUSION-

 

-A  high load is acted on beam and column.

--all components try to overcome forces .

-as cracks seems to minor and its a 

repairable condition .

 

 

 

 

 Question 2:

a)  b)  c) 

ANSWER

 

 a) 

 

OBSERVATION-

-In here columns seems to damaged 

-and no  failure comes in beam .

 

CONCLUSION -

-When Seismic forces is acted ,

than in here plastic hinge may 

have been created over there 

due to absence  of walls .

-that is reason cracks are occured in 

there .

-it's looks like not bad but it's 

not repairable .

 

 

 

B]

OBSERVATION -

-Cracks are wide and deep 

-all Reinforcement visible .

-and look to like shear failure 

 

b) 

 

CONCLUSION-

- basiclly ,when we provided improproper 

RCC . calculation , this types 

of shear failure comes in our 

structures .

-no repairing are done in  here .

 

 

C] OBSERVATION -

-Wooden piles supported on a slab .

columns seems to completely failed .

-two slabs seems to connected a column 

and column is completely failed .

 

 

c) 

 

CONCLUSION -

-When we start to design a structure 

than proper calcultion according to 

type of structure are nessesary ,

but in here  design analysis ,

calulation mistake 

play important role , so that's a reason 

this type of failure will occur .

-i think another reason is that some 

platic hinge position , not proper 

detailing done , not provided proper 

R/F  according to demand .

-and surely not repairable.