Investigation the Performance of Irregular Steel Moment-Resisting Frame Structure under the Progressive Collapse Using nonlinear Static and Dynamic Methods

Document Type : Research Paper

Authors

1 Department of Civil Engineering, Engineering Faculty, Garmsar Branch, Islamic Azad University, Garmsar, Iran

2 Department of Civil Engineering, SemnanBranch, Islamic Azad University, Semnan, Iran

3 Department of Civil Engineering, Engineering Faculty, Mashhad Branch, Islamic Azad University, Mashhad, Iran

4 Department of Civil Engineering, Engineering Faculty, Sistan and Baluchestan University, zahedan, Iran

Abstract

This study investigates the magnitude of damage index in irregular structure under the impact of progressive collapse base on measuring values of damage index with considering nonlinear material behavior and geometrical nonlinearity in static and dynamic methods. Progressive collapse in every element and magnitude of influences of column location in damage index for every element were investigated. The main aim of this study is how progressive collapse by removing a column effects on damage index of bearing element. For this reason, impacts of progressive collapse in steel structure and also removed column location in this structure were surveyed. A four story building with moment frames and irregular plans is chosen for investigation. Loading were conducted base on 6th issue of the national building regulations of Iran and 2800-Standard. Designing of structure was done base on 10th issue of the national building regulations of Iran and ETABS software. In second step, designed structure was simulated in ABAQUS software and with considering nonlinear material behaviour and geometrical Nonlinearity under load combination which proposed by GSA analysed in static and dynamic methods. In static approach, the ultimate capacity of structure under removing every column were checked by using push-down curve. Based on results it was seen that the corner column had the maximum failure potentially. In the next step structural responses to progressive collapse under present loadings were studying by nonlinear dynamic analyse in diverse column removing scenarios. Values of displacements in top of removing column and proportional of maximum rotation of every beam end node in critical region to yield rotation are investigated. The result is exactly in accordance with static results.

Keywords


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