A multi-run and multi-mode pushover procedure for the approximate analysis of the seismic response of steel moment-resisting frames is developed and evaluated. A set of generalized force vector is defined as the combination of modal forces in order to reproduce the inertial load pattern applied to the structure when the maximum drift occurs under the earthquake ground motion. The proposed procedure is easy to implement and reduces the computational cost when compared to nonlinear dynamic analysis and adaptive nonlinear static procedures. Furthermore, it overcomes the disadvantages in the use of the modal combination rules commonly used. The paper presents a parametric analysis of the response of steel moment resisting frames under various earthquake ground motions with increasing peak ground accelerations. The advantages of the proposed procedure compared to other nonlinear static procedures in literature are highlighted.
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