Wolfgang Fellin - Böcker

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.

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.

Schnee und Eis sind faszinierende Stoffe, deren mechanische Eigenschaft nur schwer zu fassen sind, insbesondere wenn sie als Lawine ins Tal stürzen.Um typische Aufgaben der alpinen Bautechnik, wie Gründungen am Eis oder  Abschätzung des Schnee- oder Lawinendruckes, sorgfältig behandelt zu können, ist ein fundiertes Verständnis der dafür verwendeten mechanischen Modelle notwendig. Andernfalls können diese Modelle, wie z.B. eine Simulationssoftware für Lawinen, nur als Black-Box verwendet werden.Dieses Buch bietet eine Einführung in Schnee-, Eis- und Lawinenmechanik. Die physikalischen Grundlagen zum Verständnis des mechanischen Verhaltens von Schnee und Eis sowie der jahreszeitlichen Veränderung von Schnee werden dargelegt. Die wesentlichen einfachen mechanischen Modelle zur Beschreibung des Materialverhaltens von Eis und Schnee werden in einer und mehreren Dimensionen eingeführt. Des Weiteren werden einfache Modelle zur Berechnung der Geschwindigkeiten und Ausbreitung von Schnee-, Geröll und Schlammlawinen eingeführt. Zusammen mit angegebenen Erfahrungswerten können damit Belastungen auf Bauwerke in Lawinenbahnen abgeschätzt werden.