Behavior of the Splice Regions of Spliced I-Girder Bridges PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Behavior of the Splice Regions of Spliced I-Girder Bridges PDF full book. Access full book title Behavior of the Splice Regions of Spliced I-Girder Bridges by Christopher Scott Williams. Download full books in PDF and EPUB format.
Author: Christopher Scott Williams
Publisher:
ISBN:
Category : Box girder bridges
Languages : en
Pages : 249
Get Book Here
Book Description
Author: Christopher Scott Williams
Publisher:
ISBN:
Category : Box girder bridges
Languages : en
Pages : 249
Get Book Here
Book Description
Author: Christopher Scott Williams
Publisher:
ISBN:
Category :
Languages : en
Pages : 786
Get Book Here
Book Description
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.
Author: Dhiaa Mustafa T. Al-Tarafany
Publisher:
ISBN:
Category :
Languages : en
Pages : 412
Get Book Here
Book Description
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.
Author: Mary Beth Deisz Hueste
Publisher:
ISBN:
Category : Continuous bridges
Languages : en
Pages : 211
Get Book Here
Book Description
The Texas Department of Transportation designs typical highway bridge structures as simple span systems using standard precast, pretensioned girders. Spans are limited to about 150 ft due to weight and length restrictions on transporting the precast girder units from the prestressing plant to the bridge site. Such bridge construction, while economical from an initial cost point of view, may become somewhat limiting when longer spans are needed. This project focused on developing additional economical design alternatives for longer span bridges with main spans ranging from 150-300 ft, using continuous precast, prestressed concrete bridge structures with in-span splices. Phase 1 of this study focused on evaluating the current state-of-the-art and practice relevant to continuous precast concrete girder bridges and recommending suitable continuity connections for typical Texas bridge girders; the findings are documented in the Volume 1 project report. This report summarizes Phase 2 of the research including detailed design examples for shored and partially shored construction, results of a parametric design study, and results of an experimental program that tested a full-scale girder containing three splice connections. The parametric design study indicated that for bridges spanning from 150-300 ft, continuous precast, prestressed concrete girder bridges with in-span splices can provide an economical alternative to steel girder bridges and segmental concrete box girder construction. The tested splice connections performed well under service level loads. However, the lack of continuity of the pretensioning through the splice connection region had a significant impact on the behavior at higher loads approaching ultimate conditions. Improved connection behavior at ultimate conditions is expected through enhanced connection details. Recommendations for design of continuous spliced precast girders, along with several detailing suggestions are discussed in the report.
Author: Dongzhou Huang
Publisher: CRC Press
ISBN: 0429938845
Category : Technology & Engineering
Languages : en
Pages : 1029
Get Book Here
Book Description
Segmental concrete bridges have become one of the main options for major transportation projects world-wide. They offer expedited construction with minimal traffic disruption, lower life cycle costs, appealing aesthetics and adaptability to a curved roadway alignment. The literature is focused on construction, so this fills the need for a design-oriented book for less experienced bridge engineers and for senior university students. It presents comprehensive theory, design and key construction methods, with a simple design example based on the AASHTO LRFD Design Specifications for each of the main bridge types. It outlines design techniques and relationships between analytical methods, specifications, theory, design, construction and practice. It combines mathematics and engineering mechanics with the authors’ design and teaching experience.
Author: Yongqian Lin
Publisher:
ISBN:
Category : Bridges, Concrete
Languages : en
Pages : 342
Get Book Here
Book Description
Author: Akshay Parchure
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Traditionally, prestressed concrete girder bridges are limited to 150 ft span lengths in Texas due to restrictions on handling and transportation. An effective way of increasing span lengths of precast, prestressed concrete girder bridges is demonstrated using splicing technique. In spliced girder bridges, precast girder segments are transported in shorter segments for handling and transportation and then spliced together to form long-span continuous bridges. Different methods are explored for construction of spliced girder bridges. Two application examples are developed to demonstrate the design of continuous prestressed concrete spliced girder bridges for both shored and partially shored methods of construction. A three-span bridge having a span configuration of 190-240-190 ft is considered for both examples. Advantages and disadvantages of each method of construction are discussed. Construction issues that should be considered in the design are highlighted. The results of this study indicate that span lengths up to 240 ft are achievable using standard Tx70 girders with the help of splicing techniques. A parametric study is performed to further explore the design space of spliced girder bridges. The results of the parametric study, along with critical design issues that were identified, are highlighted and related recommendations are provided. The results of this study will be of significant interest to bridge engineers and researchers for guidance in implementing spliced girder bridges in Texas and other states. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151369
Author: Justin Ocel
Publisher:
ISBN:
Category : Bolted joints
Languages : en
Pages : 75
Get Book Here
Book Description
This report documents the finite element analysis of a bolted field splice connection from a hypothetical three-span continuous bridge with back spans 234 ft long, and a 300-ft center span. The connection was designed using a traditional approach and then by using a new simplified method that required fewer bolts for the web splice component. The results of the analysis demonstrated the efficacy of the new design method in that it did not result in overstressing of the girder or bolts at the strength limit state. In part because of this work, the American Association of State and Highway Transportation Officials voted in June 2016 to adopt a new design method for the design of bolted connections for steel bridges.
Author: Björn Åesson
Publisher: CRC Press
ISBN: 1482266032
Category : Technology & Engineering
Languages : en
Pages : 178
Get Book Here
Book Description
Covers theory and background of local buckling, presenting simple design calculations which address this intriguing phenomenon. Attempts to master the process of buckling are described, citing both successes and failures. A number of failure case studies are presented as well. The final section of the book presents easy-to-follow design e
Author: National Research Council (U.S.). Highway Research Board
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 80
Get Book Here
Book Description
Paper 1: Results are presented of an analytical study of the dynamic behavior of simple-span highway bridges traversed by heavy vehicles. Paper 2: Inasmuch as many highway bridges are now being built with elastomeric bearings, it was considered desirable to study the vibration effects of such bridges. Paper 3: The method and procedure used in a digital computer program are described to find horizontal and vertical movements of all joints of a truss, given the member stresses and the structure properties. Paper 4: Results are summarized of tests made to demonstrate the effect of details on the fatigue behavior of welded flexural members.
