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Author : Harvey L. Coffman
Publisher :
ISBN 13 :
Total Pages : 35 pages
Book Rating : 4.:/5 (252 download)
Download or read book Retrofitting of Reinforced Concrete Bridge Columns written by Harvey L. Coffman and published by . This book was released on 1992 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Laura Lynn Bernards
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (297 download)
Download or read book Seismic Retrofitting of Rectangular Reinforced Concrete Bridge Columns for Shear written by Laura Lynn Bernards and published by . This book was released on 1991 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Paul Daniel Rogness
Publisher :
ISBN 13 :
Total Pages : 354 pages
Book Rating : 4.:/5 (44 download)
Download or read book Retrofitting of Split Reinforced Concrete Bridge Columns Using High Strength Composites written by Paul Daniel Rogness and published by . This book was released on 1999 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yuk Hon Chai
Publisher :
ISBN 13 :
Total Pages : 174 pages
Book Rating : 4.F/5 ( download)
Download or read book Flexural Retrofit of Circular Reinforced Concrete Bridge Columns by Steel Jacketing written by Yuk Hon Chai and published by . This book was released on 1991 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zunling Sun
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.0/5 ( download)
Download or read book Flexural Retrofit of Rectangular Reinforced Concrete Bridge Columns by Steel Jacketing written by Zunling Sun and published by . This book was released on 1993 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sudharshan Navalpakkam
Publisher :
ISBN 13 :
Total Pages : 302 pages
Book Rating : 4.:/5 (48 download)
Download or read book Seismic Retrofit of Reinforced Concrete Bridge Columns with Shotcrete Jacket Confinement written by Sudharshan Navalpakkam and published by . This book was released on 1998 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 : 9780921303152
Total Pages : 12 pages
Book Rating : 4.3/5 (31 download)
Download or read book Seismic Retrofit of Circular Reinforced Concrete Bridge Columns written by and published by . This book was released on 1990 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inadequate flexural strength and ductility or shear strength of concrete bridge columns has resulted in collapse or severe damage of a number of California bridges in recent moderate earthquakes. In general, these bridges were designed prior to the new seismic design methods which were implemented in the mid-seventies. Bridges constructed in accordance with the new design methods have performed well in recent earthquakes. However, the large number of older bridges that are in service, particularly freeway overpasses designed and constructed in the 1950s and 1970s, are now recognized to have substandard design details and to constitute a cause for major concern. This paper reports the results of a theoretical and experimental program investigating retrofit techniques for circular columns by encasing the critical regions within a steel jacket. The jacket is bonded to the column using grout. Results from six large-scale column tests show that the casing acts efficiently as confinement reinforcement, enabling a displacement ductility factor of greater than 6 to be achieved. The casing also inhibits bond failures at the laps of longitudinal reinforcement in the critical regions of the column by restraining the dilation and spalling of the cover concrete which degenerates into bond failure. Comparisons of 'as-built' and retrofitted columns are presented, and experimental strengths and ductilities are compared with analytical predictions. For the covering abstract of the Conference see IRRD Abstract no. 807839.
Author : Kevin P. Baird
Publisher :
ISBN 13 :
Total Pages : 894 pages
Book Rating : 4.:/5 (393 download)
Download or read book Seismic Retrofit of Reinforced Concrete Bridge Columns Using Advanced Composite Materials written by Kevin P. Baird and published by . This book was released on 1998 with total page 894 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Majid Sadoughi Yarandi
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.:/5 (647 download)
Download or read book Seismic Retrofit and Repair of Existing Reinforced Concrete Bridge Columns by Transverse Prestressing written by Majid Sadoughi Yarandi and published by . This book was released on 2007 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sean McGuiness
Publisher :
ISBN 13 :
Total Pages : 139 pages
Book Rating : 4.4/5 (711 download)
Download or read book Experimental Characterization of Steel Jacket Retrofitted Reinforced Concrete Bridge Column Behavior in Cascadia Subduction Zone Earthquakes written by Sean McGuiness and published by . This book was released on 2021 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on seismic retrofitting of Reinforced Concrete (RC) bridge columns in the United States (U.S.) was motivated by damage observed following the 1971 San Fernando, 1989 Loma Prieta, and 1994 Northridge earthquakes of California. The research resulted in a retrofitting procedure that consisted of installing steel jackets around RC bridge columns to enhance the lateral deformation capacity. Although the research focused on the development of this retrofit strategy for bridge columns in California, the Washington State Department of Transportation (WSDOT) implemented the program in 1991. Unlike the strike-slip faults in California, seismicity in western Washington is generally dominated by the Cascadia Subduction Zone fault. The 1964 Alaska, U.S., 2010 Maule, Chile and 2011 Tohoku, Japan are examples of mega-thrust long duration earthquakes emanating from a subduction zone fault and producing ground motions with longer durations of strong shaking than strike-slip faults. The research conducted in this study was motivated by the need to assess performance of the existing retrofit strategy when subjected to the expected demands of subduction zone earthquakes. The research conducted herein was an experimental study on the behavior of steel jacket retrofitted bridge columns subjected to demands from long duration earthquakes. Six reduced scale column specimens were designed, constructed, and tested as cantilevers. WSDOT's inventory was characterized to inform the values used for the column parameters, such that the six columns were intended to reasonably cover the range of values for critical parameters. Five of six tests utilized a modified fully reversed-cyclic lateral loading protocol to include additional cycles characteristic of long duration earthquakes. The sixth test used an earthquake protocol, obtained from the response of a single degree of freedom model to a synthetic Cascadia Subduction Zone ground motion in western Washington. Study results indicated stable drifts, including minimal pinching in the load-displacement response indicative of favorable hysteretic energy dissipation, at drifts in excess of the 4\\% expectation set forth in the steel jacket retrofit design guidelines. Total deformation was primarily a result of longitudinal reinforcement bond slip and elongation at the footing-column interface with strength degradation due to low-cycle fatigue fracture.
Download or read book Seismic Evaluation and Retrofit of Existing Reinforced Concrete Bridge Columns written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Moein Hossni El-Aaarag
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.:/5 (437 download)
Download or read book Seismic Assessment and Retrofit of Split Reinforced Concrete Bridge Columns written by Moein Hossni El-Aaarag and published by . This book was released on 1999 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stacia Bell
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.3/5 (799 download)
Download or read book Modeled Behavior of Steel Jacket Retrofitted Reinforced Concrete Bridge Columns written by Stacia Bell and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aftermath of the San Fernando, Whittier, and Loma Prieta slip-strike earthquakes in 1971, 1987, and 1989, respectively, showed the inadequacy of pre-1971 reinforced concrete bridge columns and led to extensive research in the United States on seismic retrofitting of these columns. Providing steel jackets around the columns was determined to be effective in increasing lateral deformation capacity under seismic demand. The jacket can confine the concrete, such that failure occurs due to fatigue fracture of longitudinal reinforcement. Previous research did not focus specifically on behavior under long-duration subduction zone earthquakes, which can increase the likelihood of fatigue fracture relative to strike-slip earthquakes. This study focuses on behavior under demands from both strike slip and long-duration earthquakes. In this research, an analytical model of a steel jacket retrofitted reinforced concrete bridge column was developed in OpenSEES. The model consisted of a linear elastic element for the jacketed portion of the column, a fiber section to capture plasticity at the gap between the bottom of the steel jacket and top of the footing, and zero-length bond slip elements at the column-footing interface and the bottom of the jacket. The OpenSEES model was used in combination with a fatigue model to predict the fatigue failure of the longitudinal reinforcement. The column model was validated using ten test columns. This included four columns with loading protocols more reflective of strike-slip earthquakes and six columns with loading protocols reflective of long duration demands.
Author : Derek Mes
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (136 download)
Download or read book Seismic Retrofitting of Concrete Bridge Columns by External Prestressing written by Derek Mes and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to recent earthquakes and the ensuing damage, there has been some concern regarding the adequacy of older structures. In particular, there is apprehension as to the adequacy of bridges that were erected prior to the early 1970's. Before this time there was little or no design process which considered seismic behaviour of bridges. Recent codes have been adjusted to compensate for these earlier problems. However, it is not feasible to remove and rebuild all of the previously built bridges. Hence, the only remaining viable approach to improving seismic adequacy of existing bridges is seismic upgrading or retrofitting these structures to improve their strength and/or deformability. The research program presented in this thesis addresses the problem of reinforced concrete bridge column retrofitting. More specifically, the applicability of a new retrofitting technique, developed at the University of Ottawa for columns of different aspect ratios and reinforcement arrangements, will be verified in terms of concrete confinement and shear resistance. The retrofitting technique consists of wrapping and prestressing high strength steel 7-wire strands around the test columns in order to increase their ductility. The specimen's tested were based on pre-1971 design, and hence had larger transverse reinforcement spacing than the present practice. This results in a lack of concrete confinement which translates into columns with poor shear resistance which tend to have a brittle failure mode. By retrofitting with prestressing strands, placed at closer spacing than the original hoops, the concrete confinement is increased, diagonal tension resistance is improved and a more ductile response is attained. Experiments from the first phase of this research program, performed by Yalcin (1997), gave very favourable results for a given aspect ratio and reinforcement arrangement. The present experimental research, forming the second phase, examined columns with different aspect ratios and reinforcement arrangements and also gave favourable results.
Download or read book Seismic Retrofit and Repair of Reinforced Concrete Bridge Columns Using Shape Memory Alloy Spirals written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ravindra Verma
Publisher :
ISBN 13 :
Total Pages : 820 pages
Book Rating : 4.:/5 (318 download)
Download or read book Assessment of Seismic Response and Steel Jacket Retrofit of Squat Circular Reinforced Concrete Bridge Columns written by Ravindra Verma and published by . This book was released on 1993 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Frank M. Martinovic
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (1 download)
Download or read book Dynamic Testing and Analysis of Non-prismatic Reinforced Concrete Bridge Columns Retrofitted with FRP Jackets written by Frank M. Martinovic and published by . This book was released on 2001 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
