Jordan Journal of Civil Engineering

Paper Detail

Evaluation of Progressive Collapse in Steel Moment Frame with Different Braces

Volume 11, No. 2, 2017
Received: 2017/03/06, Accepted:

Authors:

Hadi Faghihmaleki; Faeze Nejati; Sohiel Zarkandy; Hossien Masoumi;

Abstract:

Progressive collapse is a phenomenon that can happen as a consequence of natural and artificial dangers. In progressive collapse mechanism, a local damage (such as removing a column) leads to a comprehensive and significant damage, which results in structure collapse. Research studies on progressive collapse of structures usually focus on gravitational and explosive loadings, in which the design goal is to increase structure robustness in order to prevent progressive collapse. During an earthquake, redistribution of the load borne by structural damaged members to the adjacent ones might lead to excessive tension or exceed resistant capacity of other members’ load, which is the result of damage expansion and dispersion. In order to study progressive collapse of structures during earthquakes, three steel moment frame buildings with CBF, EBF and BRB have been selected, which have similar plans along with 8 stories, while lacking some structural members. In the above mentioned buildings, some braces have been removed, so that the influence of such scenarios on the structure’s dynamic behavior during the earthquake could be studied. In this research, the buildings’ potential and capacity for seismic progressive collapse as well as their damage modes were determined via Incremental Dynamic Analysis (IDA). Therefore, analysis can find the most probable damage modes for improvement goals, which in turn lead to structures with higher reliability in seismic regions.

Keywords:

Progressive collapse, Concentrically braced frame (CBF), Eccentrically braced frame (EBF), Buckling restrained brace (BRB), Incremental dynamic analysis (IDA)