Continuous Prestressed Concrete Girder Bridges

Continuous Prestressed Concrete Girder Bridges
Author: Mary Beth Deisz Hueste
Publisher:
Total Pages: 211
Release: 2016
Genre: Continuous bridges
ISBN:

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.

Design of Continuous Prestressed Concrete Spliced Girder Bridges

Design of Continuous Prestressed Concrete Spliced Girder Bridges
Author: Akshay Parchure
Publisher:
Total Pages:
Release: 2013
Genre:
ISBN:

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

Evaluation and Repair Procedures for Precast/prestressed Concrete Girders with Longitudinal Cracking in the Web

Evaluation and Repair Procedures for Precast/prestressed Concrete Girders with Longitudinal Cracking in the Web
Author: Maher K. Tadros
Publisher: Transportation Research Board
Total Pages: 76
Release: 2010
Genre: Technology & Engineering
ISBN: 0309118352

This report establishes a user's manual for the acceptance, repair, or rejection of precast/prestressed concrete girders with longitudinal web cracking. The report also proposes revisions to the AASHTO LRFD Bridge Design Specifications and provides recommendations to develop improved crack control reinforcement details for use in new girders. The material in this report will be of immediate interest to bridge engineers.

Connection of Simple-span Precast Concrete Girders for Continuity

Connection of Simple-span Precast Concrete Girders for Continuity
Author: Richard A. Miller (Professional engineer)
Publisher: Transportation Research Board
Total Pages: 202
Release: 2004
Genre: Concrete beams
ISBN: 0309087937

Introduction and Research Approach -- Findings -- Interpretation, Appraisal, and Application -- Interpretation, Appraisal, and Application -- References -- Appendixes.