blast loading and evaluation of nonlinear response of structural buildings

in the conditions in which terrorist attacks on facilities and civilian places increase more and more attention to design of structures against impact loads of explosion is more important and needs special considerations. study of nature of blast loads and methods of applying it on the structure is one of the important problems. explosion is a sudden and rapid release of a great amount of energy that produces light, heat, voice and shock wave. this wave contains dense air that moves outward radially and spherically, with velocity about the sound speed. applying this huge load on structure leads to nonlinear deformations and failure in some elements. then using of nonlinear analysis is necessary. in this paper blast loads and it's parameters have been introduced, and different formulas and models for blast loading have been studied and compared, and the most suitable model for calculating and applying this load on the structural buildings has been recognized and used. then by using structural analysis softwares, nonlinear response of different structural frames against blast loading, have been calculated and evaluated. also with comparison of nonlinear behavior of structural frames with different stories and bays effective parameters on response of structures, have been recognized and introduced.