عنوان مقاله [English]
In this paper plastic hinges generation in elements, story drift and performance level of frames for various location of column removal and lateral force resisting systems are investigated. The obtained results provide better insight into the influence of lateral force resisting system on dynamic response and seismic safety of special steel frames under progressive collapse. The obtained results provide better insight into the influence of lateral force resisting system on dynamic response and seismic safety of special steel frames under progressive collapse. In this paper, applied element method for linear analysis of structures based on energy concept has been developed and introduced as modified applied element method. This method considers the structure as a set of rigid elements. Both elements of the structure are connected by a spring that contains normal, shear and rotation stiffness. Springs stiffness can be calculate according to the properties of the materials. Considering principle of minimum total energy potential for the structure, deformation in the structure are calculated. This method, with a very good accuracy and low analytical time, estimates the linear behavior of the structure in the range of small deformations. In this paper, first, the formulation of the modified applied elements method for the analysis of the behavior of linear structures in the small range of deformation is expressed, then, compare the accuracy and speed of this method with applied element method and theoretical values. The results show that in analyzing a cantilever beam with the proposed method, even with a model that includes the minimum number of elements, the error rate is less than 2 percent. However, solving this problem by applied element method with the same dimensions of element, has more than 31% of the error rate. The calculation time of the proposed method is less than 40% of the calculation time in the applied element method with 10 series of connection springs.