The blast loading on a structure is a function of the incident blast wave characteristics, that is, overpressure and dynamic pressure. But the most damaging effect to the guy cable from a nuclear explosion would be the dynamic pressure caused by the high winds which follow the chock front. This dynamic pressure reaches its maximum value very rapidly, almost zero time after the passage of the shock front, and then decays exponentially as shown by equation (17). The work of this thesis has been the investigation of a guy cable under blast loading by correcting the tension during each small time interval. The results from this procedure are considerably smaller than those in the analytical work of Mr. D. A. Ball. From this point of view, we know that the tension of the cable in such a problem can not be considered as constant. / Master of Science