The Experts below are selected from a list of 87 Experts worldwide ranked by ideXlab platform
Ken Gemes - One of the best experts on this subject based on the ideXlab platform.
-
A New Theory of Content II: Model Theory and Some Alternatives
Journal of Philosophical Logic, 1997Co-Authors: Ken GemesAbstract:This paper develops a semantical model – theoretic account of (logical) content complementing the syntactically specified account of content developed in “A New Theory of Content I”, JPL 23: 596–620, 1994. Proofs of Completeness are given for both propositional and quantificational languages (without identity). Means for handling a quantificational language with identity are also explored. Finally, this new notion of content is compared, in respect of both logical properties and philosophical applications, to alternative partitions of the standard Consequence Class relation proposed by Stelzner, Schurz and Wiengartner.
-
A new theory of content I: Basic content
Journal of Philosophical Logic, 1994Co-Authors: Ken GemesAbstract:Philosophers of science as divergent as the inductivist Carnap and the deductivist Popper share the notion that the (logical) content of a proposition is given by its Consequence Class. I claim that this notion of content is (a) unintuitive and (b) inappropriate for many of the formal needs of philosophers of science. The basic problem is that given this notion of content, for any arbitrary p and q , ⌈( p V q )⌉ will count as part of the content of both p and q . In other words, any arbitrary p and q share some common content. This notion of content has disastrous effects on, for instance, Carnap's attempts to explicate the notion of confirmation in terms of probabilistic favorable relevance, and Popper's attempts to define verisimilitude. After briefly reviewing some of the problems of the traditional notion of content I present an alternative notion of (basic) content which (a) better fits our intuitions about content and (b) better serves the formal needs of philosophers of science.
Robby Caspeele - One of the best experts on this subject based on the ideXlab platform.
-
Global resistance factor for concrete slabs exposed to fire
2020Co-Authors: Ruben Van Coile, Robby Caspeele, Luc TaerweAbstract:In this paper a safety format is proposed to be applied when using Finite Element Models (FEM) to calculate the structural response of concrete slabs during fire. It is suggested to divide the structural resistance obtained with a FEM analysis by a global factor. While maintaining a high level of simplicity, the proposed method takes into account the Consequence Class of the structure and the fire incidence rate, and allows for the incorporation of other fire protection measures.
-
Assessment of current design guidelines for vertical ties in relation to progressive collapse of RC structures
2020Co-Authors: Didier Droogné, Wouter Botte, Robby CaspeeleAbstract:Despite the recent amount of theoretical and technological developments, structural robustness is still an issue of controversy being underlined by several structural failures in the past. Current design codes point out different strategies, among which strategies to limit damages due to the collapse of a load-bearing member by applying prescriptive design and detailing mies. For example for Consequence Class 2 structures EN1991-1-7 defines a risk Class CC2b for which also vertical ties are required. Flowever, the background of the design values of vertical ties in current codes is not clear and their adequacy should be validated. Moreover effects such as membrane action and Vierendeel action are important to consider when assessing structural robustness and are difficult to incorporate when applying only traditional design methodologies. To this extent a set of numerical simulations have been executed in this contribution in order to verify the Progressive collapse behaviour of RC frames including the response of the vertical ties in the columns.
-
Reliability-based analysis of tensile surface structures designed using partial factors
2020Co-Authors: E. De Smedt, Marijke Mollaert, Robby CaspeeleAbstract:The design of tensile surface structures is based on expert judgement. A standardized design approach as for traditional buildings is not yet available for tensile surface structures. To achieve a partial factor framework similar to that for traditional buildings (i.e. within the frame of the Eurocodes), research into structural reliability calculations for tensile surface structures is needed. This paper studies a hyperbolic paraboloid cable-net structure. The structure is designed using partial factors of which the partial factor for the material is investigated in more detail. Therefore, the cable-net is designed according to three material safety factors: 1.2, 1.5 and 2.0 and the reliability index is calculated for the catenary and arching cables for each structure subjected to either snow or wind load. As expected, an increase of the material safety factor results in an increase of the reliability index. If the structure is designed according to the Eurocode for a Consequence Class 2 and a 50 year reference period (material safety factor: 1.5, EN 1993-1-11) the reliability index of the cable-net proves to be 7.36 which is almost twice as high as the target reliability index 3.8 suggested by the Eurocode for the reliability based design.
-
Assessment of the behavior of vertical ties in RC structures under progressive collapse
ce papers, 2019Co-Authors: Didier Droogné, Wouter Botte, Robby CaspeeleAbstract:Despite the recent amount of theoretical and technological developements, structural robustness is still an issue of controversy being underlined by serveral progressive collapses in te past. Current design codes point out different strategies, among which strategies to limit progressive structual damage by applying prescriptive design and detailing rules. For example, for Consequence Class 2 structures, EN1991-1-7 defines a risk Class CC2b for which also vertical ties are required. However, te background of the design values of vertical ties in current code is not clear and their adequacy should be validated. Moreover, effects such as membrane action and Vierendeel action are important to consider when assessing structural robustness and are difficult to incorporate when applying only traditional design methodologies. To this extent, a set of numerical simulations have been executed in this contribution in order to verify and investigate the progressive collapse behavior of RC frames including the redistribution of internal forces and the response of the vertical ties in columns.
Mauro Overend - One of the best experts on this subject based on the ideXlab platform.
-
Abstract of: Repair of soda–lime–silica glass
2018Co-Authors: Kyriaki Corinna Datsiou, Dominic Hall, Mauro OverendAbstract:Glass strength is very sensitive to damage accumulation during its service life. Repair methods for glass have been proposed over the last decades to volumetrically fill or remove existing flaws from the surface of glass. However, the lack of information on the strength recovery attributable to glass repair methods restrict their use to low Consequence Class applications in buildings thereby making replacement of damaged installed glass the only safe and practical solution when dealing with damaged glass. Repair methods involving volumetric filling of visible flaws with resins, removal of visible flaws with polishing and chemical repair with acid treatment of visible flaws are undertaken in this study to investigate the strength recovery in 60 artificially aged annealed glass specimens. It is found that the polishing provides the most promising strength recovery results showing a 132 and a 40% increase in design and mean strength whilst the acid treatment provides the worst performance. Polishing repairs are further investigated in this study to determine their efficacy in strength recovery after environmental ageing (exposure to UV, humidity and freeze-thaw cycles).
-
Repair of soda–lime–silica glass
Glass Structures & Engineering, 2018Co-Authors: Kyriaki Corinna Datsiou, Dominic Hall, Mauro OverendAbstract:Glass strength is very sensitive to damage accumulation during its service life. Repair methods for glass have been proposed over the last decades to volumetrically fill or remove existing flaws from the surface of glass. However, the lack of information on the strength recovery attributable to glass repair methods restrict their use to low Consequence Class applications in buildings thereby making replacement of damaged installed glass the only safe and practical solution when dealing with damaged glass. Repair methods involving volumetric filling of visible flaws with resins, removal of visible flaws with polishing and chemical repair with acid treatment of visible flaws are undertaken in this study to investigate the strength recovery in 60 artificially aged annealed glass specimens. It is found that the polishing provides the most promising strength recovery results showing a 132 and a 40% increase in design and mean strength whilst the acid treatment provides the worst performance. Polishing repairs are further investigated in this study to determine their efficacy in strength recovery after environmental ageing (exposure to UV, humidity and freeze-thaw cycles).
Kyriaki Corinna Datsiou - One of the best experts on this subject based on the ideXlab platform.
-
Abstract of: Repair of soda–lime–silica glass
2018Co-Authors: Kyriaki Corinna Datsiou, Dominic Hall, Mauro OverendAbstract:Glass strength is very sensitive to damage accumulation during its service life. Repair methods for glass have been proposed over the last decades to volumetrically fill or remove existing flaws from the surface of glass. However, the lack of information on the strength recovery attributable to glass repair methods restrict their use to low Consequence Class applications in buildings thereby making replacement of damaged installed glass the only safe and practical solution when dealing with damaged glass. Repair methods involving volumetric filling of visible flaws with resins, removal of visible flaws with polishing and chemical repair with acid treatment of visible flaws are undertaken in this study to investigate the strength recovery in 60 artificially aged annealed glass specimens. It is found that the polishing provides the most promising strength recovery results showing a 132 and a 40% increase in design and mean strength whilst the acid treatment provides the worst performance. Polishing repairs are further investigated in this study to determine their efficacy in strength recovery after environmental ageing (exposure to UV, humidity and freeze-thaw cycles).
-
Repair of soda–lime–silica glass
Glass Structures & Engineering, 2018Co-Authors: Kyriaki Corinna Datsiou, Dominic Hall, Mauro OverendAbstract:Glass strength is very sensitive to damage accumulation during its service life. Repair methods for glass have been proposed over the last decades to volumetrically fill or remove existing flaws from the surface of glass. However, the lack of information on the strength recovery attributable to glass repair methods restrict their use to low Consequence Class applications in buildings thereby making replacement of damaged installed glass the only safe and practical solution when dealing with damaged glass. Repair methods involving volumetric filling of visible flaws with resins, removal of visible flaws with polishing and chemical repair with acid treatment of visible flaws are undertaken in this study to investigate the strength recovery in 60 artificially aged annealed glass specimens. It is found that the polishing provides the most promising strength recovery results showing a 132 and a 40% increase in design and mean strength whilst the acid treatment provides the worst performance. Polishing repairs are further investigated in this study to determine their efficacy in strength recovery after environmental ageing (exposure to UV, humidity and freeze-thaw cycles).
Dominic Hall - One of the best experts on this subject based on the ideXlab platform.
-
Abstract of: Repair of soda–lime–silica glass
2018Co-Authors: Kyriaki Corinna Datsiou, Dominic Hall, Mauro OverendAbstract:Glass strength is very sensitive to damage accumulation during its service life. Repair methods for glass have been proposed over the last decades to volumetrically fill or remove existing flaws from the surface of glass. However, the lack of information on the strength recovery attributable to glass repair methods restrict their use to low Consequence Class applications in buildings thereby making replacement of damaged installed glass the only safe and practical solution when dealing with damaged glass. Repair methods involving volumetric filling of visible flaws with resins, removal of visible flaws with polishing and chemical repair with acid treatment of visible flaws are undertaken in this study to investigate the strength recovery in 60 artificially aged annealed glass specimens. It is found that the polishing provides the most promising strength recovery results showing a 132 and a 40% increase in design and mean strength whilst the acid treatment provides the worst performance. Polishing repairs are further investigated in this study to determine their efficacy in strength recovery after environmental ageing (exposure to UV, humidity and freeze-thaw cycles).
-
Repair of soda–lime–silica glass
Glass Structures & Engineering, 2018Co-Authors: Kyriaki Corinna Datsiou, Dominic Hall, Mauro OverendAbstract:Glass strength is very sensitive to damage accumulation during its service life. Repair methods for glass have been proposed over the last decades to volumetrically fill or remove existing flaws from the surface of glass. However, the lack of information on the strength recovery attributable to glass repair methods restrict their use to low Consequence Class applications in buildings thereby making replacement of damaged installed glass the only safe and practical solution when dealing with damaged glass. Repair methods involving volumetric filling of visible flaws with resins, removal of visible flaws with polishing and chemical repair with acid treatment of visible flaws are undertaken in this study to investigate the strength recovery in 60 artificially aged annealed glass specimens. It is found that the polishing provides the most promising strength recovery results showing a 132 and a 40% increase in design and mean strength whilst the acid treatment provides the worst performance. Polishing repairs are further investigated in this study to determine their efficacy in strength recovery after environmental ageing (exposure to UV, humidity and freeze-thaw cycles).