Search results for " Foundation"
showing 10 items of 119 documents
Simplified Formulation of Solution for Beams on Winkler Foundation allowing Discontinuities due to Loads and Constraints
2009
The paper discusses material for a course in Structural Mechanics addressed to second-Year Civil Engineering students. The response of beams on a Winkler foundation characterized by discontinuities in both the displacements (deflections and/or slopes) and forces (internal forces and/or loads) is studied. In particular, a simplified formulation for the solution of the discontinuous differential equation governing this problem is given. In some cases, the formulation is able to give the exact solution in a closed form. This is made possible through the use of the generalized functions, such as the well-known Unit Step Function and the Dirac delta function. The cases of discontinuities due to …
ANALISI DEL COMPORTAMENTO AD INDENTAZIONE IN TRAVI SANDWICH IN COMPOSITO CON ANIMA IN SCHIUMA POLIMERICA
2010
Nel presente lavoro si propone una estensione dei modelli basati sulla teoria delle travi vincolate su una fondazione cedevole di tipo Winkler per lo studio del comportamento ad indentazione di travi sandwich in schiuma polimerica sollecitate da carichi concentrati. L’approccio proposto è in grado di considerare schiume polimeriche aventi comportamento a compressione di tipo non lineare. Sono derivate soluzioni analitiche in forma chiusa della curva di indentazione per anime in schiuma polimerica il cui comportamento a compressione è approssimabile con un andamento bi-lineare. In tal modo è possibile considerare comportamenti di softening o hardening della schiuma nel tratto post-elastico. …
L'Islam di fronte e attraverso
2020
Il volume raccogliei testi delle lezioni introduttive di Cultura islamica tenutesi a Mazara del Vallo nel 2019 con l'intento di proporre al lettore degli argomenti di livello scientifico ma di carattere divulgativo. La cornice è quella di un contesto che desidera far conoscere e tenere vivo un antico legame con gli abitanti giunti da una sponda che non si vuole definire "opposta", ma piuttosto transfrontaliera e che quotidianamente ci attraversa e con noi si interseca. The volume collects the texts of the introductory lessons of Islamic culture held in Mazara del Vallo in 2019 with the aim of proposing to the reader topics of a scientific level but informative. The frame is that of a contex…
Inside-out Internal and External Limits to Rights: Does it matter?
2019
Literature is rich on whether and how rights are limited by external considerations, such as other rights or particularly important general interests. This article concentrates on what could be a different type of limit of rights: internal limits stemming from the very foundations of a right. Its aim is to understand whether these hypothetically different internal limits actually collapse on the idea of internal limits of coherence theories; or whether they are equivalent, in terms of effects, to external limits to rights. In order to show the origin of the troubling with internal limits, the article begins with a brief introduction of biocultural rights of indigenous peoples and local com…
How Integrated is Latvian Society? An Audit of Achievements, Failures and Challenges
2010
Alla base del processo: scientificità del progetto e attualità dei fondamenti teorici
2020
Di fronte a kaos e kosmos, ordine e disordine, teorizzazione generale e pensiero “debole”, modernità, postmodernità, surmodernità… l'uomo oggi non è in grado di formarsi un'opinione assoluta su nulla. Fare una scelta può creare problemi, forse anche disperazione, essere costretti a optare per più scelte conseguenti, come accade nel processo progettuale, può diventare davvero un dramma insolubile. Considerati questi aspetti, riteniamo sia necessario soffermarsi per fare alcune considerazioni (anche se relative e parziali) sulla disciplina, sui suoi fondamenti scientifici e sulla loro effettiva concretizzazione nel progetto architettonico. Possibili considerazioni sui fondamenti dell'architet…
Retrieval of characteristic parameters for water vapour transmittance in the development of ground based Sun-Sky radiometric measurements of columnar…
2014
Abstract. Sun–sky radiometers are instruments created for aerosol study, but they can measure in the water vapour absorption band allowing the estimation of columnar water vapour in clear sky simultaneously with aerosol characteristics, with high temporal resolution. A new methodology is presented for estimating calibration parameters (i.e. characteristic parameters of the atmospheric transmittance and solar calibration constant) directly from the sun–sky radiometer measurements. The methodology is based on the hypothesis that characteristic parameters of the atmospheric transmittance are dependent on vertical profiles of pressure, temperature and moisture occurring at each site of measurem…
Precipitable water vapour content from ESR/SKYNET sun-sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe
2018
The estimation of the precipitable water vapour content (W) with high temporal and spatial resolution is of great interest to both meteorological and climatological studies. Several methodologies based on remote sensing techniques have been recently developed in order to obtain accurate and frequent measurements of this atmospheric parameter. Among them, the relative low cost and easy deployment of sun–sky radiometers, or sun photometers, operating in several international networks, allowed the development of automatic estimations of W from these instruments with high temporal resolution. However, the great problem of this methodology is the estimation of the sun-photometric calibration par…
Hamiltonian structural analysis of curved beams with or without generalized two-parameter foundation
2013
The solution of curved Timoshenko beams with or without generalized two-parameter elastic foundation is presented. Beam can be subjected to any kind of loads and imposed external actions, distributed or concentrated along the beam. It can have external and internal restraints and any kind of internal kinematical or mechanical discontinuity. Moreover, the beam may have any spatial curved geometry, by dividing the entire structure into segments of constant curvature and constant elastic properties, each segment resting or not on elastic foundation. The foundation has six parameters like a generalized Winkler soil with the addition of other two parameters involving the link between settlements…
Unified theory for analysis of curved thin-walled girders with open and closed cross section through HSA method
2016
Abstract The behaviour of thin-walled structures is deeply influenced by non-uniform torsion and cross section distortion. In this paper the extension of the Hamiltonian Structural Analysis (HSA) Method to thin-walled straight and curved beams is presented. The proposed method solves the structural elastic problem of thin-walled beams through the definition of a Hamiltonian system composed of 1st order differential equations. The method allows engineers to solve the elastic problem by introducing the degrees of freedom and the corresponding compatibility equations, founding equilibrium equations in the variational form. The methodology is explained in the framework of the so-called Generali…