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Experimental Testing Of Non Embedded Positive Moment Connections
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Book Synopsis Experimental Testing of Non-embedded Positive Moment Connections by : Michael Slack
Download or read book Experimental Testing of Non-embedded Positive Moment Connections written by Michael Slack and published by . This book was released on 2002 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precast prestressed concrete girders have been used in bridge construction for several years in the United States. In general, these types of bridges have performed well in service conditions. Although the connections provide sufficient continuity for dead loads which cause negative moments, there has been some concern about the ability of the connections to provide continuity for the positive moments caused by live loads. Cracking has been observed at the bottom of the diaphragm at the connection and this raises concern about the connection2s performance. The National Cooperative Highway Research Program developed Project 12-53 to study the effectiveness of these connections. The focus of this research deals with the experimental testing part of project 12-53. Several specimens that represent portions of full-size bridges were tested and fatigued to evaluate their performance after cracking occurs at the bottom of the diaphragm. This report discusses the first two tests involved in the testing program, a bent strand connection and a bent bar connection. Each of the specimens underwent the same sequence of loading. The loading included initial stiffness testing and then cyclic loading to fatigue the connections. Each connection was fatigued until the connection was considered to have failed. Experimental results are included and evaluated with comparisons being made to interpret the results and provide recommendations where possible. Upon examining the results from the first two tests, it was concluded that both connections had similar failure modes. The failure of each connection was consistent with an anchorage type of failure. The ends of the girders pulled away from the diaphragm after a certain number of cycles. In the first test, the strands were simply pulled out of the diaphragm. However, in the second test, the bent bar in the connection fractured before the end of the beam pulled away from the diaphragm. Also, the second connection was stiffer and more durable than the first connection as it endured nearly twice as many cycles than the first connection. Reasons for the second connection being stiffer and more durable is likely attributed to the fact that the connection contains a larger area of steel than the first connection. However, these conclusions are preliminary and await comparison to results from future tests. One conclusion that is clear from the results from test two is the fact that the connection would have lasted longer had the stress in the bent bar been limited to values previously established from research done by PCA in the 19602s. The stress level in the bars during testing exceeded their recommendations and it is believed that had these levels not been exceeded the connection would have performed more efficiently. From the results of this research it could be recommended that bent bar connections be constructed rather than bent strand connections based on stiffness and durability. However, research is continuing on various connection configurations that may prove to be more efficient. The results of the first two tests are intended to be compared to the results of future tests to further evaluate the performance of these connections after cracking occurs at the diaphragm. At the conclusion of testing of all specimens, complete comparisons and interpretations will be made with recommendations concerning the construction of positive moment connections in precast prestressed concrete bridge construction.
Book Synopsis Diagnostic and Proof Load Tests on Bridges by : Fikret Necati Catbas
Download or read book Diagnostic and Proof Load Tests on Bridges written by Fikret Necati Catbas and published by Frontiers Media SA. This book was released on 2020-12-11 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Author :Richard A. Miller (Professional engineer) Publisher :Transportation Research Board ISBN 13 :0309087937 Total Pages :202 pages Book Rating :4.3/5 (9 download)
Book Synopsis Connection of Simple-span Precast Concrete Girders for Continuity by : Richard A. Miller (Professional engineer)
Download or read book Connection of Simple-span Precast Concrete Girders for Continuity written by Richard A. Miller (Professional engineer) and published by Transportation Research Board. This book was released on 2004 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction and Research Approach -- Findings -- Interpretation, Appraisal, and Application -- Interpretation, Appraisal, and Application -- References -- Appendixes.
Book Synopsis Connection Between Simple Span Precast Concrete Girders Made Continuous by : Amy J. Dimmerling
Download or read book Connection Between Simple Span Precast Concrete Girders Made Continuous written by Amy J. Dimmerling and published by . This book was released on 2002 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precast prestressed concrete girders have been used in bridge construction for several years in the United States. In general, these types of bridges have performed well in service conditions. Although the connections over the supports provide sufficient continuity for dead loads, which cause negative moments, there has been some concern about the ability of the connections to provide continuity for the positive moments caused by live loads. Cracking has been observed at the bottom of the diaphragm at the connection and this raises concern about the connection's performance. The National Cooperative Highway Research Program developed Project 12-53 to study the effectiveness of these connections. The focus of this research deals with the experimental testing part of project 12-53. Six specimens that represent portions of full-size bridges were tested under monotonic and cyclic loads to evaluate their performance after cracking occurs at the bottom of the diaphragm. Each connection was fatigued until the connection was considered to have failed. The bent strand and bent bar embedded connections performed well under service moments. Under negative moment all of the specimens performed well. Even after failure of the specimens they each were able to resist the negative moment. This was due to the bearing of the diaphragm against the beams. The crack closes and at this point there is no difference between the specimens. Under positive moment the embedded specimens were stiffer and the failure was more gradual than that of the not embedded specimens. The embedment adds to the stiffness of the specimens. The engagement of the diaphragm in the embedded specimens helps to prolong the failure. The warning signs of failure are more prominent in the embedded specimens. The bent bar specimens are stiffer than the bent strand but the failure occurs more rapidly. After all six of the short-length specimens are tested, full-size specimens will be tested. At that point, results from all testing will be compared and discussed providing conclusions about the behavior of positive moment connections. Also, recommendations are expected as to the design and construction of positive moment connections in precast/prestressed bridge girders made continuous.
Book Synopsis Improvement of Continuity Connection Over Fixed Piers by : M. Ala Saadeghvaziri
Download or read book Improvement of Continuity Connection Over Fixed Piers written by M. Ala Saadeghvaziri and published by . This book was released on 2004 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: To improve structural efficiency of multi-span simply supported bridges, partial and/or full continuity is provided through cast- in-place concrete diaphragms and decks. These bridges, known as Simple-Span Precast Prestressed Bridge Girders Made Continuous, are continuous for live loads. This continuity connection is also beneficial from maintenance point of view by eliminating open joints. However, continuity connections also have their own structural, construction, and maintenance shortcomings. Development of positive moments and diaphragm cracking at the internal pier due to time dependent effects of prestressing is a major structural problem that also affects bridge durability and esthetics. Another issue is that due to reinforcement congestion joint construction is time consuming and thus expensive. Furthermore, the degree of continuity varies depending on structural and construction conditions. These problems are common to various design details used by many states in the US.
Book Synopsis Progress in Mechanics of Structures and Materials by : Peter J. Moss
Download or read book Progress in Mechanics of Structures and Materials written by Peter J. Moss and published by CRC Press. This book was released on 2020-10-28 with total page 1081 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of peer-reviewed papers originally presented at the 19th Australasian Conference on the Mechanics of Structures and Materials by academics, researchers and practitioners largely from Australasia and the Asia-Pacific region. The topics under discussion include: composite structures and materials; computational mechanics; dynamic analysis of structures; earthquake engineering; fire engineering; geomechanics and foundation engineering; mechanics of materials; reinforced and prestressed concrete structures; shock and impact loading; steel structures; structural health monitoring and damage identification; structural mechanics; and timber engineering. It is a valuable reference for academics, researchers, and civil and mechanical engineers working in structural and material engineering and mechanics.
Download or read book Canadian Engineer written by and published by . This book was released on 1926 with total page 1358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precast-concrete buildings in seismic areas by : FIB – Féd. Int. du Béton
Download or read book Precast-concrete buildings in seismic areas written by FIB – Féd. Int. du Béton and published by FIB - Féd. Int. du Béton. This book was released on 2016 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document has a broad scope and is not focussed on design issues. Precast construction under seismic conditions is treated as a whole. The main principles of seismic design of different structural systems, their behavior and their construction techniques are presented through rules, construction steps and sequences, procedures, and details that should lead to precast structures built in seismic areas complying with the fundamental performance requirements of collapse prevention and life safety in major earthquakes and limited damage in more frequent earthquakes. The content of this document is largely limited to conventional precast construction and, although some information is provided on the well-known “PRESSS technology” (jointed ductile dry connections), this latter solution is not treated in detail in this document. The general overview, contained in this document, of alternative structural systems and connection solutions available to achieve desired performance levels, intends to provide engineers, architects, clients, and end-users (in general) with a better appreciation of the wide range of applications that modern precast concrete technology can have in various types of construction from industrial to commercial as well as residential. Lastly, the emphasis on practical aspects, from conceptual design to connection detailing, aims to help engineers to move away from the habit of blindly following prescriptive codes in their design, but instead go back to basic principles, in order to achieve a more robust understanding, and thus control, of the seismic behaviour of the structural system as a whole, as well as of its components and individual connections.
Book Synopsis Innovative Approaches in Computational Structural Engineering by : George C. Tsiatas
Download or read book Innovative Approaches in Computational Structural Engineering written by George C. Tsiatas and published by Frontiers Media SA. This book was released on 2020-04-22 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, numerical computation has become one of the most vigorous tools for scientists, researchers and professional engineers, following the enormous progress made during the last decades in computing technology, in terms of both computer hardware and software development. Although this has led to tremendous achievements in computer-based structural engineering, the increasing necessity of solving complex problems in engineering requires the development of new ideas and innovative methods for providing accurate numerical solutions in affordable computing times. This collection aims at providing a forum for the presentation and discussion of state-of-the-art innovative developments, concepts, methodologies and approaches in scientific computation applied to structural engineering. It involves a wide coverage of timely issues on computational structural engineering with a broad range of both research and advanced practical applications. This Research Topic encompasses, but is not restricted to, the following scientific areas: modeling in structural engineering; finite element methods; boundary element methods; static and dynamic analysis of structures; structural stability; structural mechanics; meshless methods; smart structures and systems; fire engineering; blast engineering; structural reliability; structural health monitoring and control; optimization; and composite materials, with application to engineering structures.
Download or read book PCI Journal written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Life-Cycle Civil Engineering: Innovation, Theory and Practice by : Airong Chen
Download or read book Life-Cycle Civil Engineering: Innovation, Theory and Practice written by Airong Chen and published by CRC Press. This book was released on 2021-02-26 with total page 1758 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Positive Moment Tests for Precast Concrete Panel-decked Composite Bridges by : Roberto Alejandro Osegueda
Download or read book Positive Moment Tests for Precast Concrete Panel-decked Composite Bridges written by Roberto Alejandro Osegueda and published by . This book was released on 1987 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal by : Portland Cement Association. Research and Development Laboratories
Download or read book Journal written by Portland Cement Association. Research and Development Laboratories and published by . This book was released on 1961 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering and Contracting written by and published by . This book was released on 1926 with total page 1172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book HRIS Abstracts written by and published by . This book was released on 1988 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of the Research and Development Laboratories by : Portland Cement Association. Research and Development Laboratories
Download or read book Journal of the Research and Development Laboratories written by Portland Cement Association. Research and Development Laboratories and published by . This book was released on 1961 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Steel Connection Design and Details by : Akbar R. Tamboli
Download or read book Handbook of Steel Connection Design and Details written by Akbar R. Tamboli and published by McGraw Hill Professional. This book was released on 2010 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveys the leading methods for connecting structural steel components, covering state-of-the-art techniques and materials, and includes new information on welding and connections. Hundreds of detailed examples, photographs, and illustrations are found throughout this handbook. --from publisher description.
