Decision‐making for the efficient life cycle management of structures

Abstract

Structures made of structural concrete are designed to withstand different time‐dependent or time‐independent influences during their expected service lifetime. Most of these influences can be considered in a sufficient manner by mathematical and statistical approaches, while some do appear combined with certain structural, environmental, and material boundary conditions. These can, in most cases, not be foreseen, verified or they change during the lifecycle of a concrete structure. It is therefore obligatory to rely on an efficient conservation strategy for each structure to ensure its safety and overall economic efficiency. For this purpose, the fib Model Code for Concrete Structures 2010 already suggests a general workflow to follow a predefined or provisional conservation strategy and condition control procedure. These existing proposals are yet of very general nature and disclaim practical decision‐making rules to survey and assess existing structures as part of a condition‐based conservation strategy. In this contribution, the main decision‐making options at an early stage of a construction's life cycle management are pointed out, considering their importance for a structure's time‐dependent performance and their relation to continuative decisions for conservation management. Proposals for the implementation of practical advice for condition‐based conservation strategies in international guidelines are made.

Freiformbauteile im Stahlbeton‐, Spannbeton‐ und Verbundbau: Berechnung von Querschnittswerten

“…nach jeder geometrischen Anpassung des Bauteils manuell erfolgen [10]. Die Autoren arbeiten derzeit an einem Verfahren, welches die automatisierte Ableitung von Analysemodellen aus NURBS-Volumenkörpermodellen (bewehrter) Betonbauteile ermöglichen soll [11,12] Free-form reinforced concrete, prestressed concrete and composite components: Calculation of cross-section values A resource-efficient use of concrete as a construction material can be achieved by adapting the individual shape of a component under consideration to the stresses that occur and by arranging composite construction materials (e. g. reinforcing steel, prestressing steel or structural steel) in suitable areas of the component. Due to the advancing digitalisation in the construction industry, for example in the context of Building Information Modeling, computer-aided 3D modelling methods are increasingly being used in the planning of structures.…”

“…spruchter Stahlbetonbauteile auftreten und dienen als Eingangsgröße für die iterative Bestimmung des Kräftegleichgewichts am gerissenen Querschnitt[14]. Für Querschnittsteile W a,d (Hüllrohr) und W a,h (Loch) ist in Gl (11). ein negatives Vorzeichen vor das Integral zu setzen.Tab 3.…”

Practical concepts for the use of probabilistic methods in the structural analysis and reassessment of existing bridges - presentation of latest research and implementation

“…How to quantify the complete inability to measure a certain parameter during the probabilistic calculation is still a key question in this context. Possible aspects of the decisionmaking process are shown in [34]. Whether the data from individual measurements can have an equivalent significance as the well-known normative load models is another aspect which must be addressed more detailed.…”

Automatisierte Klassifizierung von Schäden an Massivbrücken mittels Neuronaler Netze

“…Zudem wird laut BMVI [1] die Güterverkehrsleistung respektive Schwerverkehr bis 2025 weiter steigen, was zu einer erhöhten Beanspruchung der gebauten Struktur führt. Durch regelmäßige Prüfungen können Instandhaltungsmaßnahmen an den Bauwerken ideal geplant und die Belastung der Wirtschaft und Bevölkerung infolge Verkehrsbehinderungen, speziell wenn diese abrupt erforderlich sind, gering gehalten werden [3].…”