Influence of seismicity level and height of the building on progressive collapse resistance of steel frames

Abstract

Influences of building height and seismicity level on progressive collapse resistance of buildings are investigated in this paper. For the height, 4-story, 8-story and 12-story steel special moment resisting frames are focused. The obtained results indicate that taller buildings are safer against progressive collapse. To study the influence of seismicity level, different four-story structures having special moment resisting frame systems are designed for different levels of seismicity, namely, very high, high, moderate and low. The structures are evaluated, using nonlinear dynamic method and two main scenarios of the codes, including sudden removal of a corner and a middle column in the first floor. Some graphs are presented for progressive collapse resistance of the structures, depending on their seismic base shears. It is shown that the structures designed for greater seismic base shears are more resistant against progressive collapse. lapse resistance of structures, panel zone effect in seismic behavior of structures, driving a correction factor for deflection amplification factor, Cd, with panel zone effect, record selection, nonlinear dynamic analysis, accidental eccentricity, and asymmetric structures.

Progressive collapse potential of different types of irregular buildings located in diverse seismic sites

“…In this research, the effects of building height, seismicity level of site and severity of building irregularity on the progressive collapse potential were evaluated together, while in some references [17] only the parameters of the seismicity level of site and building height were discussed. Furthermore, this paper proved that both the parameters of resistance to earthquake and irregularity of structures have positive effects on mitigating progressive collapse potential, and these parameters should be evaluated together.…”

“…Because each building in everywhere has its own site seismicity level and irregularity specification and considering only one parameter from the two results in an incomplete evaluation. Nevertheless, many references [12, 16, 17, 18] evaluated only one parameter solely. Meanwhile, finding of this research in contrast with some references [18, 19] proved that irregularity of building increases the resistance to progressive collapse phenomenon, because in this research equivalent-designed buildings with and without irregularity were compared.…”

“…Meanwhile, they reported that earthquake-resistant buildings do not have the potential for progressive failure and are strong enough. Kordbagh and Mohammadi [17] investigated the effect of the building height and the seismicity of site on the resistance to progressive collapse. They reported that increasing the height would increase resistance to progressive failure, and higher seismicity of the site would also increase structural strength.…”

Theoretical investigations on load‐bearing capacity of RC flat‐plate framed structures subject to middle column loss

“…The recent events occurring in the United States [5,6] indicate that the civil engineering structures are under increasingly complicated surrounding conditions. Therefore, how to reduce the risk of progressive collapse of structures has gained increasing popularity among researchers and engineers [1][2][3][7][8][9][10][11][12][13][14][15][16][17][18][19] .…”

بررسی اثر انواع اتصال های گیردار در رفتار قاب خمشی فولادی تحت خرابی پیش‌رونده

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