TY - JOUR
T1 - Risk-based cost-benefit analysis of frame structures considering progressive collapse under column removal scenarios
AU - Beck, André T.
AU - Ribeiro, Lucas da Rosa
AU - Valdebenito, Marcos
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/12/15
Y1 - 2020/12/15
N2 - The decision to design a frame structure to bridge over a column lost due to accidental loading has obvious impacts on construction costs. Moreover, not all structures are potential targets of hazards likely leading to column loss events. In this context, we propose a formulation for risk-based cost-benefit analysis of design for load bridging over failed columns. The formulation combines normal with abnormal loading conditions, treating column loss probability as an independent parameter. The proposed formulation is employed in design of continuous beams, typical RC floors and regular frame structures. The study reveals the conditions for load bridging design in frame structures to be cost-effective. We show that column loss probabilities play a major role in optimal design and reinforcement decisions. The proposed formulation allows optimal design of frame structures addressing competition between failure modes. Under discretionary column removal, competition between local bending and local pancake failures is typical of regular frame buildings, as stronger beams favor pancake compression failures.
AB - The decision to design a frame structure to bridge over a column lost due to accidental loading has obvious impacts on construction costs. Moreover, not all structures are potential targets of hazards likely leading to column loss events. In this context, we propose a formulation for risk-based cost-benefit analysis of design for load bridging over failed columns. The formulation combines normal with abnormal loading conditions, treating column loss probability as an independent parameter. The proposed formulation is employed in design of continuous beams, typical RC floors and regular frame structures. The study reveals the conditions for load bridging design in frame structures to be cost-effective. We show that column loss probabilities play a major role in optimal design and reinforcement decisions. The proposed formulation allows optimal design of frame structures addressing competition between failure modes. Under discretionary column removal, competition between local bending and local pancake failures is typical of regular frame buildings, as stronger beams favor pancake compression failures.
KW - Discretionary column removal
KW - Load bridging design
KW - Optimal design
KW - Probability threshold
KW - Progressive collapse
KW - Regular frame structures
KW - Risk optimization
KW - Structural reliability
UR - http://www.scopus.com/inward/record.url?scp=85091665132&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2020.111295
DO - 10.1016/j.engstruct.2020.111295
M3 - Article
AN - SCOPUS:85091665132
SN - 0141-0296
VL - 225
JO - Engineering Structures
JF - Engineering Structures
M1 - 111295
ER -