Enhanced external progressive collapse mitigation scheme for RC structures

Abstract

This paper discusses enhancement of an external mitigating scheme to maximise the resistance of reinforced concrete continuous beams to progressive collapse due to interior support failure. The mitigating scheme using external unbounded fibre reinforced plastic straight cables and a relevant numerical model were presented by the authors in a published companion paper to predict the progressive collapse resistance of the mitigated beams. This study extends the previous work to efficiently enhance the resistance of mitigated beams by inspecting different mitigating scheme setups. Straight and deviated cable profiles are considered, different cable deviator locations are examined, and different cable deviations are accounted for to compare the corresponding mitigated beam resistance enhancements. The mitigating scheme setup that provides maximum increase in the beam resistance is considered the enhanced setup that efficiently maximises the increase in the mitigated beam resistance and could economically prevent progressive collapse of beams due to interior column failure.

Performance evaluation of structures with reinforced concrete columns retrofitted with steel jacketing

“…Concrete follows a non-linear uniaxial constant confinement model [29][30][31]. Steel reinforcement (rebar) and steel angles for retrofitting (Section 4) were modeled with a simplified version of the Ramberg-Osgood model [30,31] cited by Elkholy & Ariss [32], using the software. The geotechnical survey displayed a high soil performance level, and therefore, the discussion of the performance of the building is centered on the structural non-compliances.…”

Benchmark Numerical Model for Progressive Collapse Analysis of RC Beam-Column Sub-Assemblages

“…Hao et al [31] and Shi et al [32] also employed explosive loads in their studies and proposed a new methodology for analyzing the behavior of RC frames under the progressive collapse scenario. Elkholy and El-Ariss [33][34][35][36] as well as El-Ariss and Elkholy [37] presented a system and modeling algorithm for strengthening RC statically indeterminate beams to resist progressive collapse due to internal column failure. External unbounded unstressed straight wires attached to the beam at deviator and anchorage locations were proposed as part of the technique.…”

Effects of Floor System on Progressive Collapse Behavior of RC Frame Sub-Assemblages

“…Although CL can be used to highlight the key load-transfer mechanisms, the results revealed that UDL is a better representative loading scheme for investigating the progressive collapseresistance of beam-slab sub-assemblages [38,39]. El-Ariss and Elkholy [40] and Elkholy and El-Ariss [41][42][43][44] presented a modeling procedure and strengthening arrangement for RC continuous members to withstand progressive failure as a result of a missing internal column. The method features external cables attached to the beam at constraint and holding locations without being stressed.…”