NDLI: Effects of initial creep conditions and temporary unloading on the long-term response of stones

Content Provider	Springer Nature Link
Author	Sorace, Stefa
Copyright Year	1998
Abstract	A special part of a research programme concerning the tensile and bending creep behaviour of natural building stones is presented in this paper. The new experimental studies were aimed at inquiring the effects of temporary viscoplastic conditions on the time-delayed response produced by subsequent variations of the applied stress. Long-term tests were performed which consisted of unloading the specimens from different stages of the secondary creep branch and reloading them with the same, or decreased, shares of the ultimate-stress values. Further appreciable reductions in the delayed strengths were observed compared to the results of the continuous tests developed in the preceding phases of this research. At the same time, a series of instantaneous collapse reloading-tests highlighted a little influence of the initial deformation time-history on the relevant rupture-loads. Within the context of structural-diagnostic problems, these last values cannot be regarded as exhaustive references for estimating the safety limits of stone members, unless coherent interpretation criteria of the results deriving fromin-situ extracted specimens are adopted. A simple methodology is herein suggested to this aim. The delayed elasticity effects following load-removal were also analysed, and reproduced by means of a proper phenomenological law that allowed to complete the global creep model proposed in previous works.On présente une phase d'une étude sur le comportement de fluage des pierres naturelles à bâtir soumises à la flexion et à la traction. Le but de ces nouvelles expériences était d'étudier les effets d'états temporaires de viscoplasticité sur le comportement à long terme résultant des variations des efforts appliqués. Des essais à long terme consistaient à décharger les éprouvettes à partir de différentes étapes de fluage secondaire et à les recharge jusqu'aux mêmes valeurs, ou à des valeurs moindres, des efforts de rupture ultime. On a constaté des réductions significatives de la résistance en comparaison avec les résultats des essais effectués lors des précédentes phases de recherche. En même temps, une série d'essais à rupture instantanée a montré le peu d'influence exercée par l'historique de la déformation initiale sur les charges de rupture. Dans le contexte de problèmes de diagnostic de structures, ces dernières valeurs ne peuvent pas servir de références complètes pour estimer les limites de sécurité des éléments en pierre, à moins d'adopter des critères d'interprétation cohérents déduits des résultats obtenus sur des éprouvettes extraitesin situ. Pour ce faire, on présente une méthodologie. On analyse également les effets retardés d'élasticité après le déchargement, interprétés au moyen d'une loi phénoménologique qui permet de compléter le modèle général du fluage précédemment présenté.
Starting Page	555
Ending Page	562
Page Count	8
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	31
Issue Number	8
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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