Challenge

Identification of Cracks

The above image show the damage at beam column joint
In this damage is more for part of beam
Damage is caused due to not providing sufficient cover to beam from reinforcement.
May be caused due to insufficient vibration of Concrete as there will be hinderence of the reinforcement while vibration
The repair can be done providing proper cover at the joint

In above image it is clearly damage
This damage is caused due to improper shotcrete plaster materials
This damage can be repaired by removing pieces of plaster surrounding the damage materials and shotcrete once again by applying suitable adhesive

The above image show the damage exactly at beam column joint
It occurs due to joint subjected to high shear force
This type of damage temporarily repaired but during long run this damage may cause harm and also can turn into failure

The above image shows failure of Column due to Bulking
The column should be long column even though beams are provided at intermediate levels the column couldn't resist the buckling long so failure occurred
Generally buckling occurs at the midpoint of the column where the bending moment is maximum and the shear force is zero
To avoid this type of failure the reinforcement should be provided in such a way that the lapping of the all reinforcement bars in single column not meeting at same point
It is better if alternate bars are provided for lapping of joint.

The above image show failure due to shear
Generally shorter column attach high shear force
This undesirable mode of deformation caused as short column effect
This is one of mainly observed failure during earthquake Which generally occurs at the open ground floor levels

It is failure at beam column joint
It is looking like the column got misplaced after concreting and during which the concrete was unable to set for the required dimensions
So it resulted in uneven placement of concrete which caused the exposure of reinforcement
During the earthquake due to strong column and weak beam phenomenon the beam got some movement in horizontal Direction which resulted in failure of the joint and rebars got exposed

Ship work like this
in your own course.