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Full Description
This volumeaddressestheissueofuncertaintyincivilengineeringfromdesign toconstruction. Failures do occur in practice. Attributing them to a residual risk or a faulty execution of the projectdoesnotproperlycover the range of causes. A closer scrutiny of the design, the engineering model, the data, the soil-structure-interactionand the model assumptions is required. Usually, the uncertaintiesininitialandboundaryconditionsaswellasmaterialparameters are abundant. Current engineering practice often leaves these issues aside, despite the factthatnewscienti?c tools have been developed in the past decades that allow a rational description of uncertainties of all kinds, from model uncertainty to data uncertainty. It is the aim of this volume to have a critical look atcurrent engineering riskconcepts in order to raise awareness of uncertainty in numericalcom- tations, shortcomings of a strictly probabilistic safety concept, geotechnical models of failure mechanisms and their implications forconstruction mana- ment, execution,and the juristic questionas to who has to takeresponsibility. In addition, a number ofthe new procedures for modelling uncertaintyare- plained.
Our central claim is that doubts and uncertainties must be openly - dressed in the design process. This contrasts certain tendencies in the en- neering community that, though incorporating uncertainties by one or the other way in the modelling process,claim to being able tocontrol them.
Contents
Assessment of characteristic shear strength parameters of soil and its implication in geotechnical design.- Ambiguity of safety definition in geotechnical models.- The fuzziness and sensitivity of failure probabilities.- The mathematics of uncertainty: models, methods and interpretations.- Multi-parameter models: rules and computational methods for combining uncertainties.- Sensitivity analysis.- Difficulties related to numerical predictions of deformations.- FE ultimate load analyses of pile-supported pipelines - tackling uncertainty in a real design problem.- The Implications of Geotechnical Model Uncertainty for Construction Management.- Fuzzy, probabilistic and stochastic modelling of an elastically bedded beam.- Queueing models with fuzzy data in construction management.- Fuzzy models in geotechnical engineering and construction management.
