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- W2110068920 abstract "Recent events have shown that traditional design methods have not always provided sufficient protection against catastrophic failure when buildings are subjected to extreme events of an unpredictable nature. Hazards such as terrorist attack or accidental explosion followed by fire are difficult to deal with using the standard engineering methodology of designing structural capacity to match calculated loading. For one thing, catastrophic loading is virtually impossible to quantify due to its random and unpredictable nature. And even if such loading could be defined, the capacity vs. demand method would probably lead to structures too expensive to build. A design methodology is presented here that divides the structural design process into three phases based on three fundamental types of loading. The first level of loading consists of the known loads, such as those specified in building codes and those that can be accurately defined by engineering judgment. Structural design for these types of loads follows the usual demand vs. capacity methods. The second level of loading consists of the knowable loads, which can be visualized and quantified to some degree, such as earthquake loading or traditional fire exposures. Performance-based methods to design for these types of loading have been highly developed in recent years and have been very effective. The third level of loading consists of the unknowable loads, which are the catastrophic events that cannot be predicted or perhaps even envisioned before they actually occur. The most feasible way to protect a building from collapse due to a particular event of this type is to increase the overall robustness of the structure — its ability to survive all types of extreme loading. This paper offers a methodology to rationalize and quantify the third level of this approach — designing for unknowable loads. Characteristics of structures which contribute to robustness are identified and discussed. The concept of a robustness index to quantify structural robustness is introduced. Additionally, the application of such an index to evaluating robustness of new and existing buildings is discussed." @default.
- W2110068920 created "2016-06-24" @default.
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- W2110068920 date "2005-04-18" @default.
- W2110068920 modified "2023-10-18" @default.
- W2110068920 title "A Methodology to Evaluate Robustness in Steel Buildings — Surviving Extreme Fires or Terrorist Attack Using a Robustness Index" @default.
- W2110068920 doi "https://doi.org/10.1061/40753(171)51" @default.
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