Was it to physically identify crack orientation/inclination and differentiate it between lateral, flexural, shear cracks etc? Or is it for some other function i dont know about.
I think this refer to that there are two intersecting members, i.e.; beam and column.
to can follow the cracks
Yes, Even hairline cracks are easily identified, when analysed using grid lines.
Grid provides you the pattern of cracking and directions to allow you to study the detailing of reinforcement required in the joint.
I agree with om prakash
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