Abstract
Local failure of one or more components due to abnormal loading can induce the progressive collapse of a building structure. In this study, by the aid of available full-scale test results on double-span systems subjected to the middle column loss scenario, an extensive parametric study was performed to investigate the effects of different design parameters on progressive collapse performance of beam-to-column connections, i.e., beam span-to-depth ratio, catenary mechanism, and connection robustness. The selected full-scale double-span assemblies consisted of fully rigid (welded flange-welded web, SidePlate), semi-rigid (flush end-plate, extended end-plate), and flexible connections (top and seat angle, web cleat). The test results, including load-deformation responses, development of the catenary mechanism, and connection robustness, are presented in detail. The finding of this research further enables a comprehensive comparison between different types of steel beam-to-column connections since the effects of span-to-depth ratio and beam sections were filtered out.
Highlights
Progressive collapse refers to a devastating phenomenon in which failure of one key structural component, due to abnormal events, leads to chain reaction and spreads to other structural members, causing disproportionate or even entire collapse of the structure [1]
Their study confirmed that the reinforced flangeOverall,bolted the previous literature mainlyductility concerned with the anti-progressive collapse behavior connection possessesis higher and robustness compared to the conventional connection, leading to more reliable collapse performance.tests
This research comprehensively investigates comparison of types of double-span assemblies evaluate the anti-collapse thedifferent anti-collapse behavior of double-span assemblies and with to flexible, semi-rigid, and fully rigid performance beamto-column connections. This is done the aidpushdown of available test results steel beam-to-column of steel beam-to-column connections, thewith vertical load andonequivalent rotation were connections including top-seat angle and welded unreinforced flange-bolted web
Summary
Progressive collapse refers to a devastating phenomenon in which failure of one key structural component, due to abnormal events, leads to chain reaction and spreads to other structural members, causing disproportionate or even entire collapse of the structure [1]. Their study confirmed that the reinforced flangeOverall,bolted the previous literature mainlyductility concerned with the anti-progressive collapse behavior connection possessesis higher and robustness compared to the conventional connection, leading to more reliable collapse performance.tests Manyor researchers, such as Oosterhof and of typical beam-to-column connections using experimental numerical simulations. This research comprehensively investigates comparison of types of double-span assemblies evaluate the anti-collapse thedifferent anti-collapse behavior of double-span assemblies and with to flexible, semi-rigid, and fully rigid performance beamto-column connections This is done the aidpushdown of available test results steel beam-to-column of steel beam-to-column connections, thewith vertical load andonequivalent rotation were connections including top-seat angle and welded unreinforced flange-bolted web. 2. Ri Effects reliable comparison of different types of double-span assemblies and to evaluate the anti-collapse performance of steel beam-to-column connections, the vertical pushdown load and equivalent on Progressive Collapse rotation were normalized against connected beams’ plastic hinge and plastic rotation, respectively. The plastic hinge capacity of connected beams, Fp , of double-span assembly can be calculated from the following equation:
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