Influencia de la puesta en obra del hormigón armado en la durabilidad de las estructuras de hormigón armado y pretensado PDF Download
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Author: Manuel Burón Maestro
Publisher:
ISBN:
Category :
Languages : es
Pages : 0
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Author: Manuel Burón Maestro
Publisher:
ISBN:
Category :
Languages : es
Pages : 0
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Author: Manuel Burón Maestro
Publisher:
ISBN: 9788489670228
Category :
Languages : es
Pages : 415
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Author: Manuel Burón Maestro
Publisher:
ISBN:
Category :
Languages : es
Pages : 32
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Author: Manuel Burón Maestro
Publisher:
ISBN:
Category :
Languages : en
Pages : 415
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Author: FIB – International Federation for Structural Concrete
Publisher: FIB - International Federation for Structural Concrete
ISBN: 2883940401
Category : Technology & Engineering
Languages : en
Pages : 191
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Author: fib Fédération internationale du béton
Publisher: fib Fédération internationale du béton
ISBN: 2883940800
Category : Technology & Engineering
Languages : en
Pages : 151
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fib Bulletin 40 deals mainly with the use of FRP bars as internal reinforcement for concrete structures. The background of the main physical and mechanical properties of FRP reinforcing bars is presented, with special emphasis on durability aspects. For each of the typical ultimate and serviceability limit states, the basic mechanical model is given, followed by different design models according to existing codes or design guidelines. Composite FRP materials are still relatively new in construction and most engineers are unfamiliar with their properties and characteristics. The second chapter of this bulletin therefore aims to provide practising engineers with the necessary background knowledge in this field, and also presents typical products currently available in the international market. The third chapter deals with the issue of durability and identifies the parameters that can lead to deterioration, which is necessary information when addressing design issues. A series of parameters is used to identify the allowable stress in the FRP after exposure for a specified period of time in a specific environment. The bulletin covers the issues of Ultimate Limit States (primarily dealing with flexural design), Serviceability Limit States (dealing with deflections and cracking), Shear and Punching Shear and Bond and Tension Stiffening. It provides not only the state-of-the-art but also in many cases ideas for the next generation of design guidelines. The final chapter deals with the fundamental issue of design philosophy. The use of these new materials as concrete reinforcement has forced researchers to re-think many of the fundamental principles used until now in RC design. The bulletin ends with a discussion of a possible new framework for developing partial safety factors to ensure specific safety levels that will be flexible enough to cope with new materials.
Author: fib Fédération internationale du béton
Publisher: fib Fédération internationale du béton
ISBN: 9782883940758
Category : Technology & Engineering
Languages : en
Pages : 234
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Book Description
fib Bulletin 35 is the first bulletin to publish documentation from an fib short course. These courses are held worldwide and cover advanced knowledge of structural concrete in general, or specific topics. They are organized by fib and given by internationally recognized experts in fib, often supplemented with local experts active in fib. They are based on the knowledge and expertise from fib's ten Commissions and nearly fifty Task Groups. fib Bulletin 35 presents the course materials developed for the short course "Retrofitting of Concrete Structures through Externally Bonded FRP, with emphasis on Seismic Applications", given in Ankara and Istanbul in June 2005. The course drew on expertise both from outside Turkey and from the large pool of local experts on this subject. In most countries of the world, the building stock is ageing and needs continuous maintenance or repair. Moreover, the majority of existing constructions are deficient in the light of current knowledge and design codes. The problem of structural deficiency of existing constructions is especially acute in seismic regions, as, even there, seismic design of structures is relatively recent. The direct and indirect costs of demolition and reconstruction of structurally deficient constructions are often prohibitive; furthermore they entail a substantial waste of natural resources and energy. Therefore, structural retrofitting is becoming increasingly widespread throughout the world. Externally bonded Fibre Reinforced Polymers (FRPs) are rapidly becoming the technique of choice for structural retrofitting. They are cleaner and easier to apply than conventional retrofitting techniques, reduce disruption to the occupancy and operation of the facility, do not generate debris or waste, and reduce health and accident hazards at the construction site as well as noise and air pollution in the surroundings. fib Bulletin 35 gives state-of-the-art coverage of retrofitting through FRPs and presents relevant provisions from three recent standardisation milestones: EN 1998-3:2005 "Eurocode 8: Design of structures for earthquake resistance - Part 3: Assessment and retrofitting of buildings", the 2005 Draft of the Turkish seismic design code, and the Italian regulatory document CNR-DT 200/04, "Instructions for Design, Execution and Control of Strengthening Interventions by Means of Fibre-Reinforced Composites" (2004).
Author: Rayner M. Mayer
Publisher:
ISBN: 9780852989579
Category : Blades
Languages : en
Pages : 246
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Author: fib Fédération internationale du béton
Publisher: fib Fédération internationale du béton
ISBN: 9782883940642
Category : Technology & Engineering
Languages : en
Pages : 322
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Book Description
In most parts of the developed world, the building stock and the civil infrastructure are ageing and in constant need of maintenance, repair and upgrading. Moreover, in the light of our current knowledge and of modern codes, the majority of buildings stock and other types of structures in many parts of the world are substandard and deficient. This is especially so in earthquake-prone regions, as, even there, seismic design of structures is relatively recent. In those regions the major part of the seismic threat to human life and property comes from old buildings. Due to the infrastructure's increasing decay, frequently combined with the need for structural upgrading to meet more stringent design requirements (especially against seismic loads), structural retrofitting is becoming more and more important and receives today considerable emphasis throughout the world. In response to this need, a major part of the fib Model Code 2005, currently under development, is being devoted to structural conservation and maintenance. More importantly, in recognition of the importance of the seismic threat arising from existing substandard buildings, the first standards for structural upgrading to be promoted by the international engineering community and by regulatory authorities alike are for seismic rehabilitation of buildings. This is the case, for example, of Part 3: Strengthening and Repair of Buildings of Eurocode 8 (i. e. of the draft European Standard for earthquake-resistant design), and which is the only one among the current (2003) set of 58 Eurocodes attempting to address the problem of structural upgrading. It is also the case of the recent (2001) ASCE draft standard on Seismic evaluation of existing buildings and of the 1996 Law for promotion of seismic strengthening of existing reinforced concrete structures in Japan. As noted in Chapter 1 of this Bulletin, fib - as CEB and FIP did before - has placed considerable emphasis on assessment and rehabilitation of existing structures. The present Bulletin is a culmination of this effort in the special but very important field of seismic assessment and rehabilitation. It has been elaborated over a period of 4 years by Task Group 7.1 Assessment and retrofit of existing structures of fib Commission 7 Seismic design, a truly international team of experts, representing the expertise and experience of all the important seismic regions of the world. In the course of its work the team had six plenary two-day meetings: in January 1999 in Pavia, Italy; in August 1999 in Raleigh, North Carolina; in February 2000 in Queenstown, New Zealand; in July 2000 in Patras, Greece; in March 2001 in Lausanne, Switzerland; and in August 2001 in Seattle, Washington. In October 2002 the final draft of the Bulletin was presented to public during the 1st fib Congress in Osaka. It was also there that it was approved by fib Commission 7 Seismic Design. The contents is structured into main chapters as follows: 1 Introduction - 2 Performance objectives and system considerations - 3 Review of seismic assessment procedures - 4 Strength and deformation capacity of non-seismically detailed components - 5 Seismic retrofitting techniques - 6 Probabilistic concepts and methods - 7 Case studies
Author: Arántzazu EspañaRoch
Publisher:
ISBN:
Category :
Languages : es
Pages :
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La corrosión del acero de refuerzo es una de las principales causas de deterioro en las estructuras de hormigón. Las principales consecuencias de la corrosión de las armaduras son la reducción de la sección transversal de la barra, el desprendimiento y fisuración del recubrimiento y el deterioro de las características de adherencia entre el hormigón y el acero. Dichas consecuencias conllevan a la disminución de la capacidad portante máxima, la pérdida de la capacidad de servicio y la seguridad estructural. En la actualidad existen dos teorías sobre si afecta o no la fisuración en la corrosión de las armaduras, llegando a ser contradictorias. La normativa española, EHE‐08 (Gobierno de España, 2008) trata la fisuración con una de las teorías en el artículo 49o del Capítulo 11, prescribiendo anchos de fisura variables en función del ambiente, que pueden llegar a condicionar el diseño, mientras que en el método del Anejo 9 no considera la influencia de la fisuración. Los códigos y normativas consideran que los criterios de durabilidad se deben satisfacer en términos de ancho de fisura, recubrimiento del hormigón y cantidad de cemento, los cuales deben ser satisfechos independientemente. Por este motivo, la fisuración tiene una gran influencia en la comprobación de la durabilidad y limitar la fisura es fundamental. Sin embargo, estos parámetros interactúan entre sí, abriendo la posibilidad de un diseño optimizado para una vida útil equivalente, no considerada en las normativas actuales, que pueden hacer que, aunque aparezcan microfisuras, la estructura siga teniendo la durabilidad adecuada para el tiempo para el que ha sido proyectado. El objetivo de este TFM es estudiar cómo afecta la fisura en el cálculo de la durabilidad y determinar cuáles son los criterios para un diseño optimizado, en el que se tengan en cuenta factores como el recubrimiento y las características del hormigón, con un ancho de fisura menor que 0,5 mm. De este modo, se hará una comparativa sobre la armadura necesaria para cumplir con la normativa y la armadura necesaria en el caso del diseño optimizado.
