PROPOSED SYSTEM FOR REDUCING PROGRESSIVE COLLAPSE POTENTIAL OF STEEL MOMENT RESISTING FRAMES | ||
| International Journal of Advances in Structural and Geotechnical Engineering | ||
| Volume 06, Issue 01, February 2022, Pages 78-86 PDF (290.24 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/asge.2022.274840 | ||
| Abstract | ||
| Progressive collapse may be defined as the spread of an initial local failure from element to element, eventually resulting in the collapse of an entire structure or a disproportionately large part of it. The uncertainty related to lack of knowledge of which columns will be lost during extreme events makes it very complicated to consider all possibilities of column loss scenarios. Progressive collapse is triggered if the surrounding elements are not able to transfer loads that were originally carried by the lost member to other paths. Hence, alternate load paths need to be available in order to prevent collapse of the whole structural system. In this paper, a system composed of tension members is proposed to improve the performance of multi-story steel moment resisting frames upon loss of a column considering a comprehensive study of possible scenarios. The system depends on tension diagonal members to contribute to distributing the load whenever a column is lost. Static and dynamic linear analyses are performed to assess the efficiency of the system under multiple column loss scenarios. More than 450 two-dimensional finite element models are built representing steel moment resisting frames (SMRF) having different number of stories, considering multiple scenarios for column loss in addition to different arrangements for added tension ties. Results focus on impact of the proposed system on reducing the potential of progressive collapse of steel moment resisting frames. | ||
| Keywords | ||
| Progressive collapse; Alternative path; Collapse reduction | ||
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