Behavior Of Uhpc Structural Members Subjected To Pure Torsion

Author : Mohammed Ismail
Publisher : kassel university press GmbH
Page : 287 pages
File Size : 44,7 Mb
Release : 2015-01-01
Category : Torsion
ISBN : 9783862199525

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Behavior of UHPC Structural Members subjected to Pure Torsion by Mohammed Ismail Pdf

Ultra High Performance Concrete (UHPC) is characterized by a very high compressive strength which may reach more than 200 MPa. The behavior of this material under tension and compression actions has been established to be very brittle in nature. Discontinuous fibers (normally steel fibers) are usually added to the UHPC mix to introduce ductility. In order to investigate the beneficial effects of using fiber reinforced UHPC in structural members subjected to torsion, a series of experimental tests on 17 UHPC beams subjected to pure torsion were carried out. The test beams consisted of plain UHPC beams, UHPC beams reinforced with steel fibers only, UHPC reinforced with steel fibers and different combinations of traditional longitudinal and transverse reinforcement. The plain UHPC beams showed very brittle behavior, whereas the UHPC beams with steel fibers only showed a post cracking ductile behavior. The addition of little steel fiber volume (e.g. 0.5 %) to the plain UHPC beams enhanced the ductility. The enhancement at the ultimate capacity amounts to about 20 %. Meanwhile, the steel fibers with 0.9 % by volume showed much enhanced ductility and a maximum enhancement of the torsional carrying capacity up to 32 %. The addition of moderate steel fiber volume (e.g. 0.9 %) to one type of traditional reinforcement (either longitudinal or transverse) accomplished an effective post cracking torsional carrying mechanism. The steel fibers shows a tendency to replace the missing type of traditional reinforcement, however this should be confirmed by more tests and by using higher steel fiber volumes. A series of experimental tests on fiber reinforced UHPC prisms to investigate the post cracking shear strength and stiffness of the used UHPC mix (e.g. M3Q) was conducted. The results of these tests revealed that this fine grained UHPC mix has a weak post cracking shear behavior. The results of these tests were used later in the Finite Element (F.E) model. An analytical model based on the well known thin-walled tube analogy was developed in order to estimate the torsional carrying capacity of beams under pure torsion having different combinations of steel fibers and traditional reinforcement. The comparison between the test and model results showed very good agreement for all cases. A finite element model based on calibrated small scale tests was developed using ATENA F.E. package to predict the full load-deformation behavior of the test beams. The predictions of the model show very good agreement with the test results.

Author : FIB – International Federation for Structural Concrete
Publisher : FIB - International Federation for Structural Concrete
Page : 555 pages
File Size : 41,8 Mb
Release : 2020-08-01
Category : Technology & Engineering
ISBN : 9782883941410

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Fibre Reinforced Concrete: From Design to Structural Applications by FIB – International Federation for Structural Concrete Pdf

The first international FRC workshop supported by RILEM and ACI was held in Bergamo (Italy) in 2004. At that time, a lack of specific building codes and standards was identified as the main inhibitor to the application of this technology in engineering practice. The workshop aim was placed on the identification of applications, guidelines, and research needs in order for this advanced technology to be transferred to professional practice. The second international FRC workshop, held in Montreal (Canada) in 2014, was the first ACI-fib joint technical event. Many of the objectives identified in 2004 had been achieved by various groups of researchers who shared a common interest in extending the application of FRC materials into the realm of structural engineering and design. The aim of the workshop was to provide the State-of-the-Art on the recent progress that had been made in term of specifications and actual applications for buildings, underground structures, and bridge projects worldwide. The rapid development of codes, the introduction of new materials and the growing interest of the construction industry suggested presenting this forum at closer intervals. In this context, the third international FRC workshop was held in Desenzano (Italy), four years after Montreal. In this first ACI-fib-RILEM joint technical event, the maturity gained through the recent technological developments and large-scale applications were used to show the acceptability of the concrete design using various fibre compositions. The growing interests of civil infrastructure owners in ultra-high-performance fibre-reinforced concrete (UHPFRC) and synthetic fibres in structural applications bring new challenges in terms of concrete technology and design recommendations. In such a short period of time, we have witnessed the proliferation of the use of fibres as structural reinforcement in various applications such as industrial floors, elevated slabs, precast tunnel lining sections, foundations, as well as bridge decks. We are now moving towards addressing many durability-based design requirements by the use of fibres, as well as the general serviceability-based design. However, the possibility of having a residual tensile strength after cracking of the concrete matrix requires a new conceptual approach for a proper design of FRC structural elements. With such a perspective in mind, the aim of FRC2018 workshop was to provide the State-of-the-Art on the recent progress in terms of specifications development, actual applications, and to expose users and researchers to the challenges in the design and construction of a wide variety of structural applications. Considering that at the time of the first workshop, in 2004, no structural codes were available on FRC, we have to recognize the enormous work done by researchers all over the world, who have presented at many FRC events, and convinced code bodies to include FRC among the reliable alternatives for structural applications. This will allow engineers to increasingly utilize FRC with confidence for designing safe and durable structures. Many presentations also clearly showed that FRC is a promising material for efficient rehabilitation of existing infrastructure in a broad spectrum of repair applications. These cases range from sustained gravity loads to harsh environmental conditions and seismic applications, which are some of the broadest ranges of applications in Civil Engineering. The workshop was attended by researchers, designers, owner and government representatives as well as participants from the construction and fibre industries. The presence of people with different expertise provided a unique opportunity to share knowledge and promote collaborative efforts. These interactions are essential for the common goal of making better and sustainable constructions in the near future. The workshop was attended by about 150 participants coming from 30 countries. Researchers from all the continents participated in the workshop, including 24 Ph.D. students, who brought their enthusiasm in FRC structural applications. For this reason, the workshop Co-chairs sincerely thank all the enterprises that sponsored this event. They also extend their appreciation for the support provided by the industry over the last 30 years which allowed research centers to study FRC materials and their properties, and develop applications to making its use more routine and accepted throughout the world. Their important contribution has been essential for moving the knowledge base forward. Finally, we appreciate the enormous support received from all three sponsoring organizations of ACI, fib and Rilem and look forward to paving the path for future collaborations in various areas of common interest so that the developmental work and implementation of new specifications and design procedures can be expedited internationally.

Author : Alphose Zingoni
Publisher : CRC Press
Page : 4442 pages
File Size : 53,8 Mb
Release : 2016-11-25
Category : Technology & Engineering
ISBN : 9781317280620

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Insights and Innovations in Structural Engineering, Mechanics and Computation by Alphose Zingoni Pdf

Insights and Innovations in Structural Engineering, Mechanics and Computation comprises 360 papers that were presented at the Sixth International Conference on Structural Engineering, Mechanics and Computation (SEMC 2016, Cape Town, South Africa, 5-7 September 2016). The papers reflect the broad scope of the SEMC conferences, and cover a wide range of engineering structures (buildings, bridges, towers, roofs, foundations, offshore structures, tunnels, dams, vessels, vehicles and machinery) and engineering materials (steel, aluminium, concrete, masonry, timber, glass, polymers, composites, laminates, smart materials). Some contributions present the latest insights and new understanding on (i) the mechanics of structures and systems (dynamics, vibration, seismic response, instability, buckling, soil-structure interaction), and (ii) the mechanics of materials and fluids (elasticity, plasticity, fluid-structure interaction, flow through porous media, biomechanics, fracture, fatigue, bond, creep, shrinkage). Other contributions report on (iii) recent advances in computational modelling and testing (numerical simulations, finite-element modeling, experimental testing), and (iv) developments and innovations in structural engineering (planning, analysis, design, construction, assembly, maintenance, repair and retrofitting of structures). Insights and Innovations in Structural Engineering, Mechanics and Computation is particularly of interest to civil, structural, mechanical, marine and aerospace engineers. Researchers, developers, practitioners and academics in these disciplines will find the content useful. Short versions of the papers, intended to be concise but self-contained summaries of the full papers, are collected in the book, while the full versions of the papers are on the accompanying CD.

Author : Bernhard Middendorf,Ekkehard Fehling,Alexander Wetzel
Publisher : BoD – Books on Demand
Page : 206 pages
File Size : 49,6 Mb
Release : 2020-01-01
Category : Technology & Engineering
ISBN : 9783737608282

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Ultra-High Performance Concrete and High Performance Construction Materials by Bernhard Middendorf,Ekkehard Fehling,Alexander Wetzel Pdf

With HiPerMat 5 on March 11-13, 2020 the 5th International Symposium on Ultra-High Performance Concrete and High Performance Construction Materials documents the actual state of development of application in the fields of: Material Science and Development, Composite Concrete Materials, Strength and Deformation behaviour of UHPC, Durability and Sustainability of UHPC, Design and Construction with UHPC, Structural Modelling and Optimisation, Lightweight Concrete Structures, High-Precision Manufacturing for Pre-Fabrication, Nanotechnology for Construction Materials, Innovative Applications, Smart Construction Materials, This volume contains the short versions (two pages) of all contributions that have been accepted for publication at HiPerMat 5.

Author : Ekkehard Fehling,Bernhard Middendorf,Jenny Thiemicke
Publisher : kassel university press GmbH
Page : 274 pages
File Size : 44,7 Mb
Release : 2016-03-01
Category : Technology & Engineering
ISBN : 9783737600941

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Ultra-High Performance Concrete and High Performance Construction Materials by Ekkehard Fehling,Bernhard Middendorf,Jenny Thiemicke Pdf

Author : Ekkehard Fehling,Bernhard Middendorf,Jenny Thiemicke
Publisher : BoD – Books on Demand
Page : 310 pages
File Size : 50,9 Mb
Release : 2024-01-01
Category : Technology & Engineering
ISBN : 9783737611596

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Ultra-High Performance Concrete and High Performance Building Materials for Sustainable Construction by Ekkehard Fehling,Bernhard Middendorf,Jenny Thiemicke Pdf

Sustainable construction, with the overarching goal of reducing the environmental footprint of everything we build is becoming increasingly important and urgent in the light of the climate change the world is facing. The use of innovative and sustainable building materials, especially concrete as the worldwide most commonly used building material, offers a great opportunity to significantly reduce climate-relevant emissions in the construction sector. Due to their performance and reliable durability, the use of innovative high-performance concretes will help to reduce the need for new constructions and to sustainably repair existing infrastructure. In new buildings in particular, the use of high-performance materials can help to save energy and natural resources, which reduces climate-relevant emissions and thus global warming. With the current HiPerMat 6, we are responding to the growing understanding of the impact of our construction activities on the environment by placing greater emphasis on sustainability issues.

Author : Duwa Hamisi Chengula
Publisher : kassel university press GmbH
Page : 226 pages
File Size : 55,7 Mb
Release : 2018-02-28
Category : Electronic
ISBN : 9783737604420

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Improving Cementitious Properties of Blended Pozzolan Based Materials for Construction of Low Cost Buildings in Mbeya Region, Tanzania by Duwa Hamisi Chengula Pdf

This study therefore investigated and improved cementitious properties of pozzolan blended with calcium hydroxide, gypsum and cement in order to extend its use from low strength mortars to concrete works which can be used for low to medium rise structural applications. Characterization, strength tests and durability tests were performed on pozzolan mixtures under laboratory conditions and the effects of adding gypsum to pozzolan and calcium hydroxide mixtures on the compressive strength and durability of cured concrete specimens were investigated.

Author : Mulatu Liyew Berihun
Publisher : Springer Nature
Page : 600 pages
File Size : 42,9 Mb
Release : 2022-01-01
Category : Computers
ISBN : 9783030937126

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Advances of Science and Technology by Mulatu Liyew Berihun Pdf

This two-volume set of LNICST 411 and 412 constitutes the refereed post-conference proceedings of the 9th International Conference on Advancement of Science and Technology, ICAST 2021, which took place in August 2021. Due to COVID-19 pandemic the conference was held virtually. The 80 revised full papers were carefully reviewed and selected from 202 submissions. The papers present economic and technologic developments in modern societies in 7 tracks: Chemical, Food and Bioprocess Engineering; Electrical and Electronics Engineering; ICT, Software and Hardware Engineering; Civil, Water Resources, and Environmental Engineering ICT; Mechanical and Industrial Engineering; Material Science and Engineering; Energy Science, Engineering and Policy.

Author : Insert Name Here
Publisher : kassel university press GmbH
Page : 1059 pages
File Size : 53,6 Mb
Release : 2012-01-01
Category : Concrete
ISBN : 9783862192649

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Ultra-High Performance Concrete and Nanotechnology in Construction. Proceedings of Hipermat 2012. 3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials by Insert Name Here Pdf

Author : American Concrete Institute
Publisher : Unknown
Page : 460 pages
File Size : 45,8 Mb
Release : 1973
Category : Science
ISBN : UOM:39015004568245

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Analysis of Structural Systems for Torsion by American Concrete Institute Pdf

Author : FIB – International Federation for Structural Concrete
Publisher : FIB - Féd. Int. du Béton
Page : 2322 pages
File Size : 43,6 Mb
Release : 2019-05-27
Category : Technology & Engineering
ISBN : 9782940643004

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CONCRETE Innovations in Materials, Design and Structures by FIB – International Federation for Structural Concrete Pdf

This Proceedings contains the papers of the fib Symposium “CONCRETE Innovations in Materials, Design and Structures”, which was held in May 2019 in Kraków, Poland. This annual symposium was co-organised by the Cracow University of Technology. The topics covered include Analysis and Design, Sustainability, Durability, Structures, Materials, and Prefabrication. The fib, Fédération internationale du béton, is a not-for-profit association formed by 45 national member groups and approximately 1000 corporate and individual members. The fib’s mission is to develop at an international level the study of scientific and practical matters capable of advancing the technical, economic, aesthetic and environmental performance of concrete construction. The fib, was formed in 1998 by the merger of the Euro-International Committee for Concrete (the CEB) and the International Federation for Prestressing (the FIP). These predecessor organizations existed independently since 1953 and 1952, respectively.

Author : Zdenek P. Bazant,Jaime Planas
Publisher : Routledge
Page : 640 pages
File Size : 54,5 Mb
Release : 2019-03-04
Category : Technology & Engineering
ISBN : 9781351447294

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Fracture and Size Effect in Concrete and Other Quasibrittle Materials by Zdenek P. Bazant,Jaime Planas Pdf

Fracture and Size Effect in Concrete and Other Quasibrittle Materials is the first in-depth text on the application of fracture mechanics to the analysis of failure in concrete structures. The book synthesizes a vast number of recent research results in the literature to provide a comprehensive treatment of the topic that does not give merely the facts - it provides true understanding. The many recent results on quasibrittle fracture and size effect, which were scattered throughout many periodicals, are compiled here in a single volume. This book presents a well-rounded discussion of the theory of size effect and scaling of failure loads in structures. The size effect, which is the most important practical manifestation of fracture behavior, has become a hot topic. It has gained prominence in current research on concrete and quasibrittle materials. The treatment of every subject in Fracture and Size Effect in Concrete and Other Quasibrittle Materials proceeds from simple to complex, from specialized to general, and is as concise as possible using the simplest level of mathematics necessary to treat the subject clearly and accurately. Whether you are an engineering student or a practicing engineer, this book provides you with a clear presentation, including full derivations and examples, from which you can gain real understanding of fracture and size effect in concrete and other quasibrittle materials.

Author : S.O. Ekolu,M. Dundu,X. Gao
Publisher : IOS Press
Page : 1562 pages
File Size : 46,7 Mb
Release : 2014-12-05
Category : Technology & Engineering
ISBN : 9781614994664

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Construction Materials and Structures by S.O. Ekolu,M. Dundu,X. Gao Pdf

The two volumes of these Proceedings contain about 200 conference papers and 10 keynote papers presented at the First International Conference on Construction Materials and Structures, held in Johannesburg, South Africa from 24 to 26 November 2014. It includes sections on Materials and characterization; Durability of construction materials; Structural implications, performance, service life; Sustainability, waste utilization, the environment; and Building science and construction.

Author : Ekkehard Fehling,Michael Schmidt,S. Stürwald
Publisher : kassel university press GmbH
Page : 922 pages
File Size : 41,5 Mb
Release : 2008-01-01
Category : High strength concrete
ISBN : 9783899583762

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Ultra High Performance Concrete by Ekkehard Fehling,Michael Schmidt,S. Stürwald Pdf

Author : Ekkehard Fehling,Michael Schmidt,Joost Walraven,Torsten Leutbecher,Susanne Fröhlich
Publisher : John Wiley & Sons
Page : 198 pages
File Size : 45,9 Mb
Release : 2015-04-20
Category : Technology & Engineering
ISBN : 9783433030875

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Ultra-High Performance Concrete UHPC by Ekkehard Fehling,Michael Schmidt,Joost Walraven,Torsten Leutbecher,Susanne Fröhlich Pdf

Selected chapters from the German concrete yearbook are now being published in the new English "Beton-Kalender Series" for the benefit of an international audience. Since it was founded in 1906, the Ernst & Sohn "Beton-Kalender" has been supporting developments in reinforced and prestressed concrete. The aim was to publish a yearbook to reflect progress in "ferro-concrete" structures until - as the book's first editor, Fritz von Emperger (1862-1942), expressed it - the "tempestuous development" in this form of construction came to an end. However, the "Beton-Kalender" quickly became the chosen work of reference for civil and structural engineers, and apart from the years 1945-1950 has been published annually ever since. Ultra high performance concrete (UHPC) is a milestone in concrete technology and application. It permits the construction of both more slender and more durable concrete structures with a prolonged service life and thus improved sustainability. This book is a comprehensive overview of UHPC - from the principles behind its production and its mechanical properties to design and detailing aspects. The focus is on the material behaviour of steel fibre-reinforced UHPC. Numerical modelling and detailing of the connections with reinforced concrete elements are featured as well. Numerous examples worldwide - bridges, columns, facades and roofs - are the basis for additional explanations about the benefits of UHPC and how it helps to realise several architectural requirements. The authors are extensively involved in the testing, design, construction and monitoring of UHPC structures. What they provide here is therefore a unique synopsis of the state of the art with a view to practical applications.