Description: Das Projekt "Basis for the design of timber structures" wird vom Umweltbundesamt gefördert und von Eidgenössische Technische Hochschule Zürich, Institut für Baustatik und Konstruktion, Gruppe Risiko und Sicherheit durchgeführt. The aim of this research project is to establish the basis for deriving a consistent set of probabilistic models for strength and stiffness related timber material properties and to calibrate corresponding partial safety factors such that the level of structural reliability for timber structures is equivalent to the safety of concrete and steel structures. This seen in the light of the ongoing revision of the national Swiss codes for the design of structures. CONCLUSIONS/PERSPECTIVES: The statistical characteristics of strength related short term timber material properties are assessed and treated in consistency with the implemented quality control and selection for grading procedures. The suggested probabilistic modelling seems to provide the required framework for establishing a basis for codification of design and assessment by means of quantifying the efficiency of the different quality control and selection for grading procedures. It is envisaged that different quality control and selection for grading procedures may be described by means of their regression characteristics and probability of acceptance curves corresponding to different grading criteria. It also has been demonstrated how an optimal (in terms of monetary benefit) set of timber grades can be identified through the solution of an optimization problem. An approach for the probabilistic modeling of the effect of load duration is presented. The method is exemplified for calibrating the design code short term strength modification factor kmod for different characteristics of the applied loading process. The considered damage model takes basis in fracture mechanical considerations and is able to take both creep and fatigue effects into account. The damage model is calibrated against duration of load tests. Furthermore, the damage model has been investigated and compared with a simpler model not including the effect of fatigue. A proposal for a proper representation of the duration of load effect in the probabilistic model code of the Joint Committee on Structural Safety will be subject of further investigations.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Stahlbeton ? Holzwerkstoff ? Seen ? Zürich ? Beleuchtung ? Kalibrierung ? Schweiz ? Bodendegradation ? Bodenstruktur ? Wirkung ? Holz ? Qualitätsmanagement ? Forschungsprojekt ? Bodenbelastung ? Bodenbewegung ? Bodenlösung ? Wirkungsgrad ? Modellierung ? Berichterstattung ? Probabilistische Methode ? Technisches Risiko ? Sicherheitsvorschrift ? Baufläche ? kurzzeitig ? Annäherung ? Zuverlässigkeit ? angewandt ? bewerten ? Akzeptanz ? national ? statistisch ? vergleichen ? verwandt ? Aufbereiteter Boden ? Auslese ? Belastungsanalyse ? Bodeneffizienz ? Buchgrundstück ? Dauer ? Gegenwart ? Gesetzbuch ? Kodifizierung ? Kriterium ? Methode ? Perspektive ? Projektstudium ? Schlußfolgerung ? Schädigung ? Thema ? Untersuchung ? Verarbeiten ? Vertretung ? Vorgang ? Vorschlag ? Vorschläge ? Werkzeug ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2001-07-01 - 2005-12-31
Webseite zum Förderprojekt
http://www.km.fgg.uni-lj.si/coste24/coste24.htm (Webseite)Accessed 1 times.