1,721,046 research outputs found
Methodology for Landslide Damage Assessment
No full textAbstractThis article focuses on an original methodology for landslide damage assessment of either masonry or reinforced concrete ordinary buildings at the urban scale. In the first step of the methodology, an analysis of the crack patterns is quickly performed for all the buildings by means of the Load Path Method [1]. The second step consists in the filling in of new survey damage forms and it ends with the creation of a landslide damage geotechnical chart of the region under study. This chart includes geomorphological data together with both the damage grade of the buildings and the direction of the possible settlements
Interpretazione del comportamento meccanico di argille da intensamente a mediamente fessurate
No full textOn the compression behaviour of intensely to medium fissured clays
No full textThe compression behaviour of four clays outcropping within the Apennine chain in southern Italy is investigated in the light of their different fissuring features. For each of the fissured mesostructures under study a Fissuring Dentification chart has been created on the basis of a classification chart for fissuring recently proposed by the Authors. The laboratory tests were carried out on both natural and reconstituted clay specimens, and the results have been compared with those recognised in the literature to be typical of unfissured sensitive clays. Based on such comparisons, a unique framework of compression behaviour is found to be followed by the clays, independently of their different Fissuring IDentification charts. It appears to be still a sensitivity framework although for clays having Stress Sensitivity values (Cotecchia & Chandler, 2000) below unity, due to the fissured mesostructure. Conversely, the swelling behaviour of the clays is seen to be dependent on the fissuring intensity
On the model requirements to predict the behaviour of fissured clays
No full textThe paper reports the key features of the behaviour of different fissured clays whose fissuring features have been first related to specific classes within a characterization chart proposed by the Authors. For each of the clays under study, a Fissuring IDentity (F-ID) Chart has been created by selecting the most relevant fissuring features within the general chart. The approach used in the interpretation of the mechanical behaviour of the fissured clays has been that of continuum mechanics, through the development of element testing in the laboratory, analysis of the results in the framework of traditional Critical State Soil Mechanics and modelling following traditional elastic-plastic theory. Throughout the paper the mechanical effects of the different fissuring fea-tures of the clays have been evaluated accounting for their F-ID charts. The paper reports also the further requirements which elastic-plastic models of structured clays have to accomplish with in order to represent the behaviour of fissured clays
Caratterizzazione idraulica di Flysch argillosi sede di escursioni piezometriche stagionali innescanti movimenti di frana
No full textProcessi di localizzazione della deformazione e comportamento al taglio di argille fessurate
No full textBehavioural features of fissured clays: experimental evidence and modelling
No full textFissured clays are widespread all over the world and they are often catalysts of several and unexpected in-situ problems. In the last decade, a research started at the Technical University of Bari aiming to interpret the influence of fissuring on the clay behaviour. According to the approach adopted, a Fissuring IDentity (F-ID) has been associated to each clay being studied, as extracted from a general fissuring characterisation chart. Hence, the analysis of the fissured clay behaviour has benefited from systematically coupling the micro- to meso- features (i.e., F-ID charts) and processes, and the observations of the macro-response. The comprehensive experimental programme carried out on several Italian fissured clays has allowed to recognise that they can be still modelled as single geotechnical class which follows an extended sensitivity framework of behaviour. Moreover, for clays of specific F-IDs, most recent developments of the research have put in evidence discrepant behavioural facets induced by scale effects
The influence of intense fissuring on the mechanical behaviour of clays
No full text The paper discusses the geological history, intrinsic properties, structural features and mechanical behaviour of three differently fissured clays outcropping within the Apennine chain in southern Italy. Based on a large experimental database, the mechanical behaviour of the clays is investigated in the light of their different fissuring features, which have been distinguished and characterised by means of a new chart. The study assumed the soil to be a continuum, despite the different fissuring features of the clay fabric. Therefore laboratory tests were carried out on both natural and reconstituted clay samples, and the results were compared with those recognised in the literature to be typical of unfissured sensitive clays. Based on these comparisons, a behavioural framework is proposed for clays possessing certain fissure structures. The results of the analysis show that the mini- to mesostructure of clays of fissuring intensity I5–I6 can be modelled as part of the structure variable controlling the clay behaviour. Where the structure variable refers solely to the micro scale for unfissured homogeneous clays, for fissured clays I5–I6 it spans from the micro to the meso scale. As for the microstructure of unfissured clays, this micro- to mesostructure influences the soil response as an internal state variable in addition to specific volume in controlling the mechanical response. In particular, it appears that for clays of fissuring intensity I5–I6, structure is detrimental to strength, so that the material is even weaker than the reconstituted clay. </jats:p
A first approach to optimum design of cable supported bridges using load path method
No full textBorn as a method to design strut-and-tie models in reinforced concrete structures, the load path method (LPM) shows its effectiveness in the easy perception of the physical behaviour of a structure, from its global behaviour to the most accurate details. In this paper, starting from the interpretation of cable-supported bridge behaviour using LPM, two different approaches are proposed for the shape optimum design of this particular type of bridge
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