ABSTRACT
Masonry is a kind of load-bearing material made of the block materials (bricks or masonry blocks) bonded together by mortar. Compared with concrete, masonry has a certain capacity of compressive strength but lower capacity in tensile, shearing and bending strength. Therefore, masonry structure especially plain masonry has a very poor integrity, rather low capacity of load-bearing and is vulnerable to crack under external loads. Masonry needs to be repaired and retrofitted in the following situations:
a. Settlement cracks were formed in the wall because of the uneven settlement of foundation.
