be safely tolerated by the wall in this case strengthening elements 1 must be applied to the wall so as to eliminate the threat posed by the excess shear stress in order to determine the cross sectional area and vertical frequency i e interval of the strengthening elements to eliminate the shear stress along the wall 39 s cross section the below given method is followed the theoretical shear force in an unreinforced masonry wall with strengthening elements is taken up by both the wall itself and the mentioned strengthening elements this concept may be expressed by following formula the maximum shear force that can be tolerated by the wall is calculated as follows hence the shear force that the strengthening elements need to resist can be found as follows the required strengthening element area and interval i e frequency in line with the force to be counterbalanced by the strengthening elements 1 can be calculated according to the following formula v u00e7 a sh u00b7 f y u2062 u2062 d u00b7 d s h 1 7 according to this result the physical characteristics of the strengthening elements 1 manufactured from carbon fibers in the form of a grid and given in the representative implementation of the present invention are as follows modulus of elasticity e 210 000 n mm 2 tensile strength 2 400 n mm 2 ultimate strength 2 900 n mm 2 elongation at breaking point 1 2 density 1 6 gr cm 3 in the.