âComputational Civil Engineering - "Intersections" International Journal

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“Computational Civil Engineering 2005”, International Symposium 173terms of connections between the component parts of the structure, ofconnections to the ground, and of loading assumptions.3) As in general, such a computer program yields a very large amount of results,from these it will be necessary to extract the possible combinations whichprovide the highest loading and strain values to be used in comparing themwith the design limit values.4) In the case of the investigated structures, we consider that the adopted modelsand the results obtained were the correct ones, being confirmed by the 10 yearsof service life of brine pipe duct during which no defects have been discovered.References1. Jantea C., Varlam F., Poduri metalice. Editura Venus, Iasi, 19962. Dalban C., Juncan N., Varga Al., Dima S., Construcţii metalice, Bucureşti, editura Didactică şipedagogică, 19843. *** SR 1911 – 98, Poduri metalice de cale ferată. Prescripţii de proiectare.4. *** STAS 10101/20 – 1990, Acţiuni în construcţii. Încărcări de vânt
“Computational Civil Engineering 2005”, International SymposiumIaşi, România, May 27, 2005The study of geocomposite influence on wearing course asphaltmixture behavior at permanent deformationElena Diaconu, Carmen Răcănel1 Prof., Ph.D., Road Department, Tehnical University of Civil Engineering, Bucharest, Romania2 Assoc.Prof., Ph.D., Road Department, Tehnical University of Civil Engineering, Bucharest, RomaniaSummaryFollowing the research, it was demonstrated that can be used the octahedral shearstress theory to analyze the premature deformation that appear in pavementasphalt layers.This paper has an intention to study the influence of the place of geocompositeunder the asphalt layer on the values of octahedral shear stress ratio.To solve this problem we use the material characteristics obtained in laboratorfrom triaxial test and an analyze of stresses and strains state in pavement structure,with and without geocomposite obtained using an elastic linear software.The conclusion that can de drawn is the following: the placement of geocompositelead to smaller octahedral shear stress ratio values in wearing course than in thecase of structure without geocomposite.KEYWORDS: geocomposite, asphalt mixture, permanent deformation1. INTRODUCTIONOne of the most important distresses that can appear in a flexible pavementstructure is the permanent deformation. This kind of distress has considerableeffects on circulation comfort and safety and for this reason the asphalt mixturethat can become deformed under traffic and temperature, must be taken intoaccount.During the time it was demonstrated that the octahedral shear stress ratio (OSSR) isa very important parameter from pavement deformation point of view and gives thepotential for rutting of mix. The OSSR (equation (1)) is the ratio of the criticalinduced octahedral shear stress in the pavement layer (τ oct ) to the octahedral shearstrength of the material (τ oct, strength ):
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