Improving the Development Characteristics of Steel Reinforcing Bars PDF Download

Author: Emmanuel Kwame Idun
Publisher:
ISBN:
Category : Reinforcing bars
Languages : en
Pages : 534

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Author: Civil Engineering Research Foundation
Publisher: American Society of Civil Engineers
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 104

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This report describes the development and implications of a new concrete reinforcing bar with significantly improved bond strength.

Author:
Publisher:
ISBN: 9789276420170
Category :
Languages : en
Pages :

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NEWREBAR research project aims to develop a new typology of steel reinforcing bars provided by enhanced properties in terms of ductility and durability towards aggressive environmental conditions. The need of such kind of steels depends by the fact that the decrease of ductility both under monotonic and cyclic loading conditions was assessed for most of actual reinforcing steels (e.g. TempCore ) exposed to corrosion phenomena. During the project, two final reinforcing steel products were developed and industrially produced, called respectively DPF and DPD in relation to the specific chemical composition selected for their realization, almost aligned with what actually on market and therefore not related to production costs' increase. Results of experimental tests and correlations highlighted the improvement in terms of durability performance of Dual-Phase steel reinforcing grades concerning ductility (Agt mainly) respect to traditional TempCore grades, with higher residual values of deformation capacity and, therefore, benefit to the overall structural performance. With the aim of fully understanding the influence of Dual-Phase steel bars to RC constructions, several case study buildings were designed according the capacity design approach: numerical nonlinear models were elaborated to assess the buildings' behaviour through pushover or incremental dynamic analyses in which the nonlinear behaviour of elements was modelled using a lumped plasticity approach, where the moment/ rotation behaviour of hinges was calibrated basing on the results of experimental tests performed on full-scale prototypes. Basing on the results of both mechanical characterization of DP grades and numerical analyses' results, recommendations for the adoption of DP grades in RC constructions were elaborated, as well as indications for introduction in current European standards.

Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 572

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18

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For reinforced concrete structures subjected to blast effects, response at very high strain rates (up to 1000 s-1) is often sought. At these high strain rates, the reinforcing bars yield stress can increase by 100%, or more, depending on the grade of steel used. The dynamic increase factor (DIF), i.e. the ratio of the dynamic to static value, is normally reported as function of strain rate. Knowledge of the DIF is of significant importance in the design and analysis of structures for explosives safety. DIF curves for both yield and ultimate strengths have been derived and published in manuals by the Tri-Services, the Defense Special Weapons Agency, the Air Force, and the Department of Energy. However, these curves are typically based on limited data, and even on data from steel bars of a different grade. A literature review of the effects of high strain rates on the properties of steel reinforcing bars (rebars) was conducted. Static and dynamic properties were gathered for bars satisfying ASTM A615, A15, A432, A431, and A706, with yield stresses ranging from 42 to 103 ksi (290 to 710 MPa). The data indicates that the DIF decreases for higher rebar yield stress, and that the DIF is higher for yield stress than for ultimate stress. A simple relationship is proposed that gives the DIF (for both yield and ultimate stress) as a function of strain rate and yield stress.

Author: Bahram M. Shahrooz
Publisher: Transportation Research Board
ISBN: 030915541X
Category : Science
Languages : en
Pages : 83

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TRB's National Cooperative Highway Research Program (NCHRP) Report 679: Design of Concrete Structures Using High-Strength Steel Reinforcement evaluates the existing American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications relevant to the use of high-strength reinforcing steel and other grades of reinforcing steel having no discernible yield plateau. The report also includes recommended language to the AASHTO LRFD Bridge Design Specifications that will permit the use of high-strength reinforcing steel with specified yield strengths not greater than 100 ksi. The Appendixes to NCHRP Report 679 were published online.

Author: James Marion Whelan Jr.
Publisher: Forgotten Books
ISBN: 9780428519629
Category : Technology & Engineering
Languages : en
Pages : 86

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Excerpt from Variation in the Mechanical Properties of Reinforcing Bars The phenomenal development of reinforced concrete in the last few years has brought with it new materials, new methods, new structures, and consequently, many new problems. So rapid has been the advance in the use of concrete, that the proper working out of many of these problems has lagged far behind the need of their solution. Even the materials themselves have not been thoroughly standardized. It is true that the cement, sand, and stone, and the resulting concrete have been the subjects of much study and discussion and many questions concerning them have been settled. The quality of the steel reinforcement, how ever, has, until the last year or two, been neglected. The material used for the first reinforcing bars was the mild steel or low-carbon grade known as structural steel. This was natural as structural shapes were frequently used as rein forcement. Also, the properties of this mild steel were well known, and the mills were making it in large quantities, so that it was easy to obtain. It was early seen, however, that the maximum effective strength of the reinforcement depended upon the yield point of the material. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Author: fib Fédération internationale du béton
Publisher: fib Fédération internationale du béton
ISBN: 9782883940505
Category : Technology & Engineering
Languages : en
Pages : 448

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"In 1993, the CEB Commission 2 Material and Behavior Modelling established the Task Group 2.5 Bond Models. It's terms of reference were ... to write a state-of-art report concerning bond of reinforcement in concrete and later recommend how the knowledge could be applied in practice (Model Code like text proposal)... {This work} covers the first part ... the state-of-art report."--Pref.

Author: Qing Wang
Publisher: CRC Press
ISBN: 1000771229
Category : Technology & Engineering
Languages : en
Pages : 701

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Book Description
Advances in Civil Function Structure and Industrial Architecture contains the Proceedings of 5th International Conference on Civil Function Structure and Industrial Architecture (CFSIA 2022), which was held on January 21-23, 2022, in Harbin, China. The Proceedings of CFSIA 2022 is intended to share scientific research results and cutting-edge technologies in the field of civil function structure and control engineering. Researchers, practitioners and academics in these disciplines will find the book useful. Over 90 papers are featured. Many topics are covered, but the contributions may be seen to fall into one of six broad themes of the conference, namely: (i) Engineering Structure (Engineering Advanced Technology, Engineering Structure and Seismic Resistance, High-rise Building and Large-span Structure, Bridge Engineering, Special Structure, Construction Technology, Monitoring and Control of Structure, Cartography and GIS, Concrete Structure, Construction and Control, etc.); (ii) Intelligent Building (Predictive Maintenance, Converged Networks, Wireless Retrofit, Biometric Integration, Computer Management System Engineering, Building Equipment Automatic Control System Engineering, etc.); (iii) Smart City (Intelligent Construction, Intelligent Transportation, Risk Management and Decision Making for Intelligent Construction, Intelligent Building Automation Control System, etc.); (iv) Structural Seismic Resistance (Structural Seismic Design, Earthquakes and Ground Motions, Building Site, Foundation and Basis, Principles of Structural Seismic Design Calculation, Seismic Shear Adjustment and Minimum Seismic Shear Requirements, etc.); (v) Monitoring and Testing (Steel Structure Stress Monitoring, Stress Change Monitoring for Large Construction Projects, Structural Health Monitoring, Foundation Pit Monitoring, Temperature Monitoring for Large Volume Concrete Pouring, etc.); (vi) Engineering Facility (Machinery Facility, Electrical Facility, Stationary Facility, Non-standard Facility, Compressor, Continuous Transmission Facility, etc.).

Author: Airong Chen
Publisher: CRC Press
ISBN: 1000342042
Category : Technology & Engineering
Languages : en
Pages : 1758

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Book Description
Life-Cycle Civil Engineering: Innovation, Theory and Practice contains the lectures and papers presented at IALCCE2020, the Seventh International Symposium on Life-Cycle Civil Engineering, held in Shanghai, China, October 27-30, 2020. It consists of a book of extended abstracts and a multimedia device containing the full papers of 230 contributions, including the Fazlur R. Khan lecture, eight keynote lectures, and 221 technical papers from all over the world. All major aspects of life-cycle engineering are addressed, with special emphasis on life-cycle design, assessment, maintenance and management of structures and infrastructure systems under various deterioration mechanisms due to various environmental hazards. It is expected that the proceedings of IALCCE2020 will serve as a valuable reference to anyone interested in life-cycle of civil infrastructure systems, including students, researchers, engineers and practitioners from all areas of engineering and industry.