Progressive Collapse Criteria and Design Approaches Improvement

Marchand, Kirk A.; Stevens, David

doi:10.1061/(asce)cf.1943-5509.0000706

Cited by 18 publications

(5 citation statements)

References 12 publications

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Section: Introductionmentioning

confidence: 75%

“…This suggests that when assessing robustness, one must take into account such different degrees of failure consequences (Gerasimidis & Sideri, 2016). This requirement also aligns with the current development of performance-based design methodology, which sets an intermediate performance value as the design target (Marchand & Stevens, 2015). Existing structural robustness studies have largely neglected to reflect the unique conditional cascading and disproportionate nature of progressive collapse, which rendered many of the existing robustness indices incongruous with progressive collapse design.…”

Section: Background and Research Motivationmentioning

confidence: 91%

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Robustness-Based Optimal Progressive Collapse Design of Reinforced Concrete

Praxedes Silva Neto

2023

Preprint

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Progressive collapse of structures is a cascading failure phenomenon with a failure consequence that is disproportionate to the direct damage of an initiating event. The Ronan Point Building collapse in 1968 triggered the start of research on disproportionate progressive collapse in building structural engineering. Intense research was followed after the Alfred P. Murrah Federal Building bombing in 1995 and the disastrous collapse of the World Trade Centre after aircraft strikes. Progressive collapse has essentially two distinct features: system- rather than component-level responses, and low probability and high consequences. The majority of existing design codes and standards consider progressive collapse implicitly, by improving the performance of a structure through the specification of minimum levels of strength, continuity, and ductility. On the other hand, existing explicit design procedures largely consist of a component-based design approach. This study proposes an innovative system-based and risk-informed decision making framework for progressive collapse design of reinforced concrete frames. Considering the full spectrum of risk due to initiating events, a novel risk-based robustness index is proposed as a system-level performance criterion for design. From a conventionally designed structure, an optimization pro- cess identifies optimal allocation of resources that results in a robust system. An efficient design frontier is defined based on optimal designs when varying the additional expenses provided for the improvement of robustness of a structure. The efficient frontier is then used to verify the cost effectiveness of the design alternatives in conjunction with the cumulative prospect theory. In order to assist in the decision-making process of progressive collapse design provisions, a risk-cost trade-off framework is proposed. The design framework establishes whether additional resources must be used to enhance the robustness of a structure, and when required, it further identifies the optimal expenses that should be used to prevent potential progressive collapse.

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Section: Introductionmentioning

confidence: 75%

Section: Background and Research Motivationmentioning

confidence: 91%

Robustness-Based Optimal Progressive Collapse Design of Reinforced Concrete

Praxedes Silva Neto

2023

Preprint

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“…The second approach generally requires the design team to envision certain initial structural damage scenarios, without regard to cause, and to design the system as a whole to be sufficiently robust that it can absorb such damage without general disproportionate collapse. Modern design guidelines and code officials favor the latter threat-independent approach because it is not possible to identify or characterize all sources of abnormal loads [46]. Instead, the officials ask that the structure be designed to withstand various threat-independent damage scenariosremoval of a first-story corner column or exterior bearing wall as surrogates for robustness.…”

Section: Design For Conditional Limit Statesmentioning

confidence: 99%

Risk-Informed Approaches for Mitigating Impacts of Extreme and Abnormal Events in the Built Environment

Ellingwood

2021

Springer Tracts in Civil Engineering

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Our built environment is essential for community health and welfare. Even with proper design and construction to withstand demands imposed by occupancy, service requirements and natural environmental hazards, buildings and other civil infrastructure may be susceptible to damage due to events outside the design envelope, which may include extreme windstorms, earthquakes, flooding, accidents or intentional malevolence. The human and economic losses that result from such damage can be significant. Changes in design and construction practices over the past several decades have made some modern structural systems vulnerable to extreme and abnormal events. Social and political factors also have led to an increase in events that may pose a threat to civil infrastructure. Finally, public awareness of infrastructure performance and safety issues has increased markedly in recent years. The move toward risk-informed design, with its formal tools for analyzing uncertainties and consequences of damage or failures in the built environment, promises a level of coherence in decision-making that cannot be achieved by judgment alone, and increases the likelihood that judgements, when necessary, are consistent with logic and the available data. Codes and standards provide a highly visible forum for demonstrating economic and social benefits of risk-informed design. Chapter 3 explores the prospects of improving engineering practices to enhance facility robustness and to manage the risk of unacceptable damage from low-probability, high-consequence threats.

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“…The problem of studying the bearing capacity of damaged structures is very relevant because of the adverse consequences of the destruction of buildings [1,2]. In Russia, when designing unique buildings and structures, the calculation of load-bearing structures is performed with damage to their individual elements [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. One of the ways to calculate survivability is to apply a modified long-term load with a dynamic coefficient to the changed design.…”

Section: Introductionmentioning

confidence: 99%

Analysis of dynamic coefficients for damage to the middle support of two-span and three-span continuous beams

Tusnin

2017

MATEC Web Conf.

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Annotation. The paper deals with the operation of continuous two-and three-span beams with damage to the middle support. For a two-span continuous beam, the dynamic coefficients for the action of concentrated forces over the middle support and span of the beam are theoretically substantiated. The results of numerical studies of double-span beams at different loads and time intervals of damage to the middle support are presented. The method of dynamic calculation, which can be used to calculate the survivability of steel structures, has been worked out. A good correspondence of the dynamic coefficients obtained numerically with theoretical values is established. Depending on the order of the formation of the design, the dynamic coefficients vary from 1 to 3. For survivability of the design, the pre-bending of the beams above the middle support is most dangerous. With the use of a well-grounded numerical technique, the dynamic coefficients for a continuous three-beam beam are investigated. For continuous beams, if the middle supports are damaged, it is recommended to use a dynamic coefficient of 2 for the load in the spans adjacent to the damaged support

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Progressive Collapse Criteria and Design Approaches Improvement

Cited by 18 publications

References 12 publications

Robustness-Based Optimal Progressive Collapse Design of Reinforced Concrete

Robustness-Based Optimal Progressive Collapse Design of Reinforced Concrete

Risk-Informed Approaches for Mitigating Impacts of Extreme and Abnormal Events in the Built Environment

Analysis of dynamic coefficients for damage to the middle support of two-span and three-span continuous beams

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