1,720,994 research outputs found
Definizione di un modello di comportamento teorico per il calcolo delle barriere antisvio mediante analisi limite
No full textLe curve di frenatura a variazione continua del contraccolpo (FCP ed FCS) in relazione alla curva di frenatura di Nemesdy
No full textExpanded polystyrene (EPS) in road construction: Twenty years of Italian experiences
Full text linkExpanded polystyrene (EPS) is a thermoplastic material, derived from pre-expanded polystyrene beads, that combines an extreme lightweight with versatile strength and thermal insulation. These characteristics made EPS an excellent alternative to natural materials for the feasibility of building and construction projects that would otherwise destined, for time and implementation costs, to be postponed or alienated. Specifically, this technology has been successfully used in road infrastructure sector in the last twenty years in the construction of roads, bridge abutments, lightweight embankments and backfills, above all for the rapid restoration of compromised roads following landslide or calamitous events, representing an interesting and resilient solution in areas exposed to seismic risk or persistent vibratory actions. Thus, the authors want to offer a critical analysis of different EPS road applications in Italy, considering benefits and drawbacks, proposing technical and economic considerations for ideal conditions of use and suggesting failure analysis methods and tools. © 2020 The Author(s)
An NMR-Based Method for the Chemical Characterization and Rheological Selection of Modified Bitumens
No full text
A Laboratory Experience Regarding the Use of Reinforcing Fibres in Open Graded Bituminous Mixtures
No full textCrack element in the non-linear f.e.m. program PA.R.M.A. for the design of reinforced concrete pavements
No full textThe code PA.R.M.A. (PAvement Reinforced Model Analysis), developed by the research group of Parma University, is a non-linear layered f.e.m. program for P.C., oriented to the analysis of reinforced concrete slabs resting upon an elastic-plastic foundation and subjected to monotonic loadings, capable of evaluating both the serviceability load and the ultimate load. In the program, flexible slabs exposed to the activity of local heavy loads, unilateral contact constitutes the dominating feature. Unilateral bonds may also become evident in the case of eccentrically loaded thick slabs or when plastic deformations appear in the elastic-plastic foundation due to variable loads. An orthotropic incrementally linear relationship and equivalent uniaxial concept are used to represent the behaviour of concrete under biaxial stresses while a uniaxial bilinear elasto-plastic model with hardening is employed for reinforcing bars. After cracking, the orthogonal fixed crack model is adopted and tension stiffening, reduction in compressive strength and stiffness after cracking, and strain softening in compression are accounted for. In this paper, is presented the implementation of the program with an original formulation of a crack element dedicated to the study of the effect in the plate due to the presence of crack in the top of it. The proposed finite element model has been tested by the comparisons with other analytical models available in literature, showing a good agreement
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