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The Khan Lecture Series honors Dr. Fazlur Rahman Khan’s legacy of excellence in structural engineering and architecture. This Lecture is organized by Dan. M. Frangopol, Fazlur Rahman Khan Endowed Chair of Structural Engineering and Architecture, Department of Civil and Environmental Engineering, ATLSS Center, Lehigh University...click here for more information
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Alfredo H-S. Ang
Research Professor, University of California, Irvine, CA
Friday, April 19, 2013 – 4:10 pm
Sinclair Lab Auditorium, Lehigh University, Bethlehem, PA
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Minimizing the Effects of Uncertainties in Developing Reliability-Based Design Criteria
Uncertainties are unavoidable in the analysis and design of engineering systems. Traditionally, engineers had to contend and dealt with significant uncertainties through conservative assumptions and applied safety factors to cover the effects of the underlying uncertainties. These assumptions and safety factors are invariably determined on the basis of engineering judgments; as such, the level of conservativeness is difficult to quantify. Proposed is a more scientific approach to handle uncertainties and to provide a systematic method to quantify and analyze their effects – namely, the reliability-based approach. The emphasis is to minimize the effects of uncertainties in the development of practical criteria for the design of infrastructure systems, including the formulation of safety factors and/or load/resistance factors in LRFD consistent with the corresponding level of uncertainties. Examples of real structures will be illustrated, including the optimal design based on minimum life-cycle cost.
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