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Analysis Of The Shear Behavior Of Prestressed Concrete Spliced Girders
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Book Synopsis Analysis of the Shear Behavior of Prestressed Concrete Spliced Girders by : Dhiaa Mustafa T. Al-Tarafany
Download or read book Analysis of the Shear Behavior of Prestressed Concrete Spliced Girders written by Dhiaa Mustafa T. Al-Tarafany and published by . This book was released on 2016 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Implementation of the spliced girder technology in bridges has been growing in recent years. Increased girder lengths can now be realized by splicing shorter precast segments to produce a long span. The research conducted in this dissertation is focused on an evaluation of spliced girders using a three dimensional finite element analysis. The project consisted of a series of tests that were conducted in two phases. In Phase I, the effect of post-tensioning ducts on the shear behavior and strength of prestressed concrete girders was evaluated. In Phase II, the focus was on the behavior of cast-in-place splice regions between precast segments. Since a limited number of full scale beams could be tested, a three-dimensional advanced finite element program is an effective alternative to expensive tests. The parameters considered were grout to girder concrete strength ratio, splice to girder concrete strength ratio, concrete shear key detailing, coupler diameter, duct to web width ratio, shear span to depth ratio, and concrete shrinkage losses. The findings are described in detail. Using the experimental and analytical results, it was found that the grout to concrete strength ratio for grouted ducts should not to be less than 0.3. The effect of increasing the duct diameter to web width ratio from 0.43 to 0.57 was minimal. Splice to girder concrete strength ratio should be greater than 0.6. The addition of a shear key had no effect on the shear capacity of the girder. The coupler diameter in the splice region had no effect on the behavior of the spliced girder for coupler diameter to web width ratio up to 0.55. Including concrete shrinkage in the analysis slightly improved the correlation with observed response.
Book Synopsis Behavior of the Cast-in-place Splice Regions of Spliced I-girder Bridges by : Christopher Scott Williams
Download or read book Behavior of the Cast-in-place Splice Regions of Spliced I-girder Bridges written by Christopher Scott Williams and published by . This book was released on 2015 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spliced girder technology continues to attract attention due to its versatility over traditional prestressed concrete highway bridge construction. Relatively limited data is available in the literature, however, for large-scale tests of post-tensioned I-girders, and few studies have examined the behavior of the cast-in-place (CIP) splice regions of post-tensioned spliced girder bridges. In addition to limited knowledge on CIP splice region behavior, a wide variety of splice region details (e.g., splice region length, mild reinforcement details, cross-sectional geometry, etc.) continue to be used in the field. In response to these issues, the research program described in this dissertation was developed to (i) study the strength and serviceability behavior of the CIP splice regions of spliced I-girders, (ii) identify design and detailing practices that have been successfully implemented in CIP splice regions, and (iii) develop design recommendations based on the structural performance of spliced I-girder test specimens. To accomplish these tasks, an industry survey was first conducted to identify the best practices that have been implemented for the splice regions of existing bridges. Splice region details were then selected to be included in large-scale post-tensioned spliced I-girder test specimens. Two tests were conducted to study splice region behavior and evaluate the performance of the chosen details. The failure mechanisms of both test girders were characterized by a shear-compression failure of the web concrete with primary crushing occurring in the vicinity of the top post-tensioning duct. Most significantly, the girders acted essentially as monolithic members in shear at failure. Web crushing extended across much of the test span and was not localized within the splice regions. To supplement the spliced girder tests, a shear-friction experimental program was also conducted to gain a better understanding of the interface shear behavior between precast and CIP concrete surfaces at splice regions. The findings of the shear-friction study are summarized within this dissertation. Based on the results of the splice region research program, design recommendations were developed, including recommended CIP splice region details.
Book Synopsis Investigation of Shear Behavior of Prestressed Concrete Girders by : David P. Gustafson
Download or read book Investigation of Shear Behavior of Prestressed Concrete Girders written by David P. Gustafson and published by . This book was released on 1966 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultimate Shear Behavior of Prestressed Concrete Bridge Girders ... by : John Cunningham Stone
Download or read book Ultimate Shear Behavior of Prestressed Concrete Bridge Girders ... written by John Cunningham Stone and published by . This book was released on 1965 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shear Behavior of Spliced Post-tensioned Girders by : Andrew Michael Moore
Download or read book Shear Behavior of Spliced Post-tensioned Girders written by Andrew Michael Moore and published by . This book was released on 2014 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: By its nature a spliced girder must contain a number of post tensioning tendons throughout its length. The focus of the experimental program described in this dissertation is the evaluation of the strength and serviceability of post-tensioned girders loaded in shear, and, more specifically, how a post-tensioning duct located in the web of a girder affects the shear transfer mechanism of a bulb-tee cross-section. Due to the limited number of tests in the literature conducted on full-scale post-tensioned girders, eleven shear tests were performed on seven prestressed concrete bulb-tee girder specimens. Of these tests, ten were conducted on specimens that contained a post-tensioning duct within their web and additional pretensioning reinforcement in their bottom and top flanges. The remaining shear test was conducted on a control specimen that did not have a post-tensioning tendon but contained the same pretensioning reinforcement as the post-tensioned girder specimens. The behavioral characteristics of these eleven test specimens at service level shear forces and at their ultimate shear strengths were evaluated in regards to five primary experimental variables: (i) the presence of a post-tensioning duct, (ii) post-tensioning duct material (plastic or steel), (iii) web-width, (iv) duct diameter, and (v) the transverse reinforcement ratio. The findings of this experimental study are described in detail within this dissertation, but can be summarized by the following two points. (i) No differences were observed in the ultimate or service level shear behavior in girders containing plastic grouted ducts when compared to those containing steel grouted ducts and (ii) The current procedure of reducing the effective web width to account for the presence of a post-tensioning duct is ineffective because it addresses the incorrect shear transfer mechanism. A method that correctly addresses the reduction in shear strength due to the presence of a post-tensioning duct was developed and verified using the tests performed during this experimental program and tests reported in the literature.
Book Synopsis Shear Behavior of Prestressed Concrete Bridge Girders ... by : David Paul Gustafson
Download or read book Shear Behavior of Prestressed Concrete Bridge Girders ... written by David Paul Gustafson and published by . This book was released on 1967 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shear Behavior of Prestressed Concrete Girder with High-strength Materials by : 張穩二
Download or read book Shear Behavior of Prestressed Concrete Girder with High-strength Materials written by 張穩二 and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Modeling of Prestress Transfer, End-region Cracks and Shear Behavior in Prestressed Concrete I-girders Employing Large-diameter Strands by : Roya Alirezaei Abyaneh
Download or read book Computational Modeling of Prestress Transfer, End-region Cracks and Shear Behavior in Prestressed Concrete I-girders Employing Large-diameter Strands written by Roya Alirezaei Abyaneh and published by . This book was released on 2016 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prestressed concrete girders are commonly fabricated with 0.5-in. (12.7-mm) or 0.6-in. (15.2-mm) diameter prestressing strands. Recent interest in the use of larger (0.7-in. (17.8-mm) diameter) strands has been driven by potential benefits associated with reduction of the required number of strands and fabrication time, or potential increases in the workable range of prestressed concrete girders (i.e., greater capacities and span capabilities). A limited number of experiments on full-scale specimens with 0.7-in. (17.8-mm) diameter strands have shown that the load-carrying capacity and strand transfer length of specimens with 0.7-in. (17.8-mm) diameter strands can be conservatively estimated using existing AASHTO LRFD provisions. However, performance at prestress transfer requires further investigation to ensure that application of the strands with standard 2-in. (50-mm) spacing and conventional concrete release strength does not increase the end-region cracking that is characteristic of prestressed girders. It must be verified that the development of such cracks does not stimulate anchorage-driven or premature shear failures prior to yielding of the shear reinforcement. Previous research lacks in monitoring of reinforcement stresses and evaluation of end-region cracking which has long been a durability concern. A reliable finite element model that captures the behavior of the specimen at prestress transfer with consideration of performance from construction stages, over the course of the service life, and up to the ultimate limit state can provide key insight into the suitability of using of 0.7-in. (17.8-mm) diameter strands. Further, it could serve as an economical tool for the investigation and proposal of efficient end-region reinforcing details to reduce concrete cracking and enhance durability. Finite element analyses of prestressed I-girder end-regions encompassing cracking and long-term creep- and shrinkage-induced damage, especially in girders fabricated with large diameter strands, have been limited. This research program assessed the limitations of 0.7-in. (17.8-mm) diameter strands at prestress transfer up to limit state response and investigated measures for enhancing the serviceability of the girders through finite element analyses using the commercial software, ATENA 3D. The finite element study was complemented with a full-scale experimental program which was used to validate the numerical results. This paper lays out a validated procedure for modeling the construction stages of prestressed girders and load testing. The model was then used as a tool for investigating alternative end-region reinforcement details for improved end-region serviceability. The most promising options are presented for consideration in further experimental studies and future implementation
Book Synopsis Investigation of Shear Behavior of Prestressed Concrete Bridge Girders by :
Download or read book Investigation of Shear Behavior of Prestressed Concrete Bridge Girders written by and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Understanding Ultimate Shear Behavior of Prestressed Concrete Girder Bridges as a System Through Experimental Testing and Analytical Methods by : Cameron David Murray
Download or read book Understanding Ultimate Shear Behavior of Prestressed Concrete Girder Bridges as a System Through Experimental Testing and Analytical Methods written by Cameron David Murray and published by . This book was released on 2017 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shear Behavior of Prestressed Concrete Girders and Structural Health Monitoring Using Fiber Bragg Grating Sensors by : Aadit Kapadia
Download or read book Shear Behavior of Prestressed Concrete Girders and Structural Health Monitoring Using Fiber Bragg Grating Sensors written by Aadit Kapadia and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research deals with six Prestressed girders that were tested to observe the shear behavior and investigate the failure mode. Three of the girders had a top slab of eight inches and were constructed with TXDOT specifications. The other three were constructed without the top slab with AASHTO specification. These were tested for bond slip behavior and with minimum reinforcement. The primary objective was to investigate the type of failure in all the girders. It was found that all of them failed in web shear and none in bond slip. One of the girders also had Fiber Bragg Grating sensors on the inside surface to observe localized bond slip. This was compared to the global slip given by the conventional sensors which led to conclusions about using those sensors instead of the conventional ones for structural health monitoring.
Book Synopsis Extending Span Ranges of Precast Prestressed Concrete Girders by : Reid Wilson Castrodale
Download or read book Extending Span Ranges of Precast Prestressed Concrete Girders written by Reid Wilson Castrodale and published by Transportation Research Board. This book was released on 2004 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.
Book Synopsis Investigation of Shear Distribution Factors in Prestressed Concrete Girder Bridges by : Benjamin Z. Dymond
Download or read book Investigation of Shear Distribution Factors in Prestressed Concrete Girder Bridges written by Benjamin Z. Dymond and published by . This book was released on 2016 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: As shear requirements for prestressed concrete girders have changed, some structures designed using older specifications do not rate well with current methods. However, signs of shear distress have not been observed in these bridge girders and they are often deemed to be in good condition. The primary objective of this research program was to investigate the accuracy of existing shear distribution factors, which are used to estimate bridge system live load effects on individual girders, and provide recommendations on shear distribution to be used in Minnesota with four components: a full-scale laboratory bridge subjected to elastic and inelastic behavior, field testing of bridges, a numerical parametric study, and integration of results to develop a screening tool to determine which structures benefitted from refined analysis. Laboratory bridge inelastic testing indicated shear force redistribution after cracking and before ultimate failure. Use of elastic distribution factors is conservative for shear distribution at ultimate capacity. Elastic laboratory testing was used to validate the finite element modeling technique and study the behavior of a barrier and end diaphragm, which affected shear distribution; ignoring their effects was conservative. Parametric study results indicated that a ratio of longitudinal stiffness to transverse stiffness could be used as a screening tool. If the stiffness ratio was less than 1.5, shear demand from a simple, conservative grillage analysis may be more accurate than shear demand from AASHTO distribution factor methods. Grillage analysis shear demand results due to permit trucks may also be more accurate, regardless of the screening tool ratio.
Book Synopsis An Exploratory Investigation of Shear Fatigue Behavior of Prestressed Concrete Girders by : Patrick Melvin Bachman
Download or read book An Exploratory Investigation of Shear Fatigue Behavior of Prestressed Concrete Girders written by Patrick Melvin Bachman and published by . This book was released on 1987 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shear Behavior of Prestressed Steel Fiber Concrete Girders by : Padmanabha Rao Tadepalli
Download or read book Shear Behavior of Prestressed Steel Fiber Concrete Girders written by Padmanabha Rao Tadepalli and published by . This book was released on 2011 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shear Behavior of High Strength Self-consolidating Concrete in Nebraska University Bridge Girders by : Alexander Michael Griffin
Download or read book Shear Behavior of High Strength Self-consolidating Concrete in Nebraska University Bridge Girders written by Alexander Michael Griffin and published by . This book was released on 2014 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: "As the nation's infrastructure continues to age, advanced concrete technologies have been developed to both reduce a structure's costs and increase its life expectancy. Since the early 1990's, self-consolidating concrete (SCC) has been one of these technologies. Many, however, have been reluctant to implement SCC in highway girders due to the mixture constituents. One of these concerns is the reduced content and size of the coarse aggregate. These differences in the concrete potentially hinder SCC's mechanical properties and shear resistance. Additionally, for high strength concretes (HSC) with weaker aggregates, shear cracks tend to propagate through the coarse aggregate, reducing the aggregate interlock component of the shear resistance. This study aimed at assessing the web-shear strength both with and without web reinforcement of two precast-prestressed Nebraska University (NU) 53 girders fabricated with high strength self-consolidating concrete (HS-SCC). The results were compared to the ACI 318 (2011) and AASHTO LRFD (2012) code estimates, and a finite element model (FEM) package, Response 2000. ATENA Engineering, a finite element analysis (FEA) program, was also used to evaluate the qualitative results, specifically crack patterns and the effect of the coarse aggregate content and size. A prestressed concrete database was also constructed to assess the effect of the reduced coarse aggregate content on the shear capacity of HS-SCC in prestressed concrete members. The mechanical properties of the HS-SCC mix were also tested and compared to relevant empirical equations. The HS-SCC mix investigated in this study proves to be a viable cost-saving alternative for bridge superstructure elements"--Abstract, page iii.
Book Synopsis Behavior of FRP Strengthened Reinforced and Prestressed Concrete Girders in Flexure, Shear, and Delamination by : Kyle Hatch Larson
Download or read book Behavior of FRP Strengthened Reinforced and Prestressed Concrete Girders in Flexure, Shear, and Delamination written by Kyle Hatch Larson and published by . This book was released on 2003 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
