Search results for "Dowel"
showing 9 items of 9 documents
FEM analysis of push-out test response of Hybrid Steel Trussed Concrete Beams (HSTCBs)
2015
Abstract Aiming to investigate the steel truss–concrete stress transfer mechanism in Hybrid Steel Trussed–Concrete Beams (HSTCBs), a three-dimensional (3D) nonlinear Finite Element (FE) model is developed. The constitutive relationship of the steel composing the plates and the rebars is modeled by means of a quadri-linear law, while the concrete behavior is defined by means of a Concrete Damaged Plasticity (CDP) model, suitable for modeling concrete and brittle materials. Two main failure mechanisms are considered, namely the tensile cracking and the compressive crushing. In order to accurately grasp the complicate dowel and bond phenomena arising at the steel–concrete interface, a 3D solid…
A Literature Review of Different Criterias for Selecting and Cementing a post- A review
2011
The primary function of a corono-radicular post is to provide retention for a core, which replaces lost coronal tooth structure and retains the final restoration without compromising the apical seal of the endodontic filling. Therefore, it is important to select a post system that provides maximum retention, yet removes as little as possible of the remaining subgingival tooth structure. Several new esthetic dowel systems are available for the restoration of endodontically treated teeth, but little is known about how effectively these dowels seal the restored teeth. These post and core restorations are subjected to repeated tension, compression and torquing forces. Most forces clinically man…
Perception, Normativity and Action in Contemporary Philosophy of Mind and Cognitive Science
Working on the background of a view of mind as “in action”, as pragmatically shaped by its own dynamic interactions with the world, emerging from the achievements of contemporary philosophy of mind (from Searle to enactivism)and cognitive science (from Gibson to Goodale and Milner)I aim to propose a view of perception as a form of human activity of which we are responsible, and in which our “commitment” to truth and rationality can take place. Against some recent phenomenalist and antirepresentationalist views of perception I'll try to show that the action-oriented character of perception does not challenge its rational constraint to a right representation of the state of affairs which it i…
Atlantin ylityksiä : amerikkalaisen kirjallisuuden- ja kulttuurintutkimuksen navigointia 1965-1995
2011
Teoriat muuttuvat paitsi aikaa myös paikkaa myöten. Kirjassa tutkitaan eurooppalaisen, varsinkin ranskalaisen teorian Atlantin ylityksiä. Millaisiksi eräät keskeiset teoriaotteet muotoutuivat yhdysvaltalaisessa yliopistomaailmassa ja kohdatessaan uudet poliittiset ja kulttuuriset haasteet? Tämän muotoutumisen vaikutukset näkyvät vuorostaan muualla. Ajanjakso on 1965–1995. "Korkean teorian" nousu liittyi kielelliseen käänteeseen ja perustojen horjumiseen, ja sen erilaisten muotojen ja myös vastustamisen tarkastelu ulottuu kielen merkityksiä hajottavasta retorisuudesta valtarakenteiden marxilaiseen analyysiin, afrikkalaisamerikkalaiseen feminismiin ja "orientalismin" symboliseen tuottamiseen …
Mieli, maailma ja referenssi : John McDowellin mielenfilosofian ja semantiikan kriittinen tarkastelu ja ontologinen täydennys
2008
Petteri Niemi tarkastelee väitöskirjassaan referenssiä eli sitä, miten mieli ja kieli viittaavat maailmaan. Arkisessa kielenkäytössämme viittaamme maailmaan sujuvasti, mutta realistisen referenssin teorian rakentaminen on osoittautunut vaikeaksi tehtäväksi filosofialle.Niemen lähtökohta on, että inhimillinen tietoisuus ja kieli todella tavoittavat maailman ulkopuolellaan. Käsitteet, jotka jäsentävät inhimillisiä mielentiloja ja kielellisiä ilmauksia eivät ole vain sosiaalisia rakennelmia, joiden takainen maailma jäisi meille tuntemattomaksi. Päinvastoin, käsitteet toimivat ikkunoina maailmaan ja maailmasta on mahdollista saavuttaa objektiivista tietoa.Niemen keskeinen väite on, että inhimil…
Analytical prediction of the shear connection capacity in composite steel–concrete trussed beams
2016
Steel–concrete trussed composite beams are a particular types of composite girders constituted by a steel truss embedded in a concrete core. The truss is typically composed by a steel plate or a precast concrete slab working as bottom chord while coupled rebars are generally used to form the upper chord. Moreover, a system of ribbed or smooth steel rebars welded to the plate and forming the diagonals of the truss, works as web reinforcement. In the present study, the attention is focused on the evaluation of the shear resistance of the connection between bottom steel plate (the bottom chord) and concrete core through the diagonal bars of the truss developing a mechanical model able to accou…
Introduzione. Mutamenti paradigmatici e nuovi modelli nel dibattito contemporaneo su razionalità, verità e mente.
2008
Evaluation of the shear connection strength of precast hybrid steel-trussed-concrete composite beams
2015
In last decades, significant efforts have been carried out by the scientific community to evaluate the main technical issues of Hybrid Steel-Trussed-Concrete beams, investigating both the first opera-tive phase, i.e. before the concrete casting, when only the bare truss works, and, the second phase, i.e. after the concrete curing, when the beam works as a composite element. In the present study, the attention is focused on the evaluation of the shear strength of the connection between the bottom plate of the steel truss and the concrete core proposing a mechanical model able to predict its ulti-mate resistance. The proposed mechanical formulation is mainly based on the extension of existing…
Effect of cyclic loading on fracture strength and microleakage of a quartz fiber dowel with different adhesive, cement and resin core material combin…
2010
Background: This study evaluated the performance of different adhesive-cement-core combinations coupled with quartz fiber dowels after cyclic loading and fracture strength tests and assessed the microleakage using dye penetration method. Methods: Forty maxillary canines (n=10 per group) were restored with fiber dowels (Quartz fiber DT Light Post) and four adhesive-cement-core material combinations [(Group 1: All-Bond 2+C&B (root) / All-Bond 2+Biscore (core); Group 2: All-Bond 2+Bisfil 2B (root) / All-Bond 2+Bisfil 2B (core); Group 3: Scotchbond 1+RelyX ARC (root) / Scotchbond 1+Supreme (core); Group 4: RelyX Unicem (root) / Scotchbond 1+Filtek Supreme (core)]. The specimens were initially c…