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 Precast, Prestressed Bridge Girders Made Continuous

Design of Precast, Prestressed Bridge Girders Made Continuous
Author: R. G. Oesterle
Publisher: Transportation Research Board National Research
Total Pages: 108
Release: 1989
Genre: Technology & Engineering
ISBN:

This report documents and presents results of a study to determine time-dependent behavior and relevant design criteria for simple-span precast, prestressed bridge girders made continuous. A questionnaire was used to determine current practice. Creep and shrinkage tests of steam-cured concrete loaded at an early age were made. Computer simulations were used to investigate the effects of time-dependent material behavior and variation in design parameters on the effective continuity for live load plus impact. The findings suggest that positive moment connections in the diaphragms at the piers are not required and provide no structural advantages. The findings also suggest that effective continuity for live load plus impact can vary from 0 to 100% dependent on the design parameters and timing of construction. Computer analyses were also used to determine an upper limit for the amount of negative moment reinforcement over the supports to insure full moment redistribution and attainment of maximum bridge strength. New computer programs were developed for simplified analysis to determine time-dependent effects and service moments. Recommendations for design procedures were presented and design examples given.

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.

Prestressed Concrete Bridges

Prestressed Concrete Bridges
Author: Nigel R. Hewson
Publisher: Thomas Telford
Total Pages: 412
Release: 2003
Genre: Technology & Engineering
ISBN: 9780727732231

Prestressed concrete decks are commonly used for bridges with spans between 25m and 450m and provide economic, durable and aesthetic solutions in most situations where bridges are needed. Concrete remains the most common material for bridge construction around the world, and prestressed concrete is frequently the material of choice. Extensively illustrated throughout, this invaluable book brings together all aspects of designing prestressed concrete bridge decks into one comprehensive volume. The book clearly explains the principles behind both the design and construction of prestressed concrete bridges, illustrating the interaction between the two. It covers all the different types of deck arrangement and the construction techniques used, ranging from in-situ slabs and precast beams; segmental construction and launched bridges; and cable-stayed structures. Included throughout the book are many examples of the different types of prestressed concrete decks used, with the design aspects of each discussed along with the general analysis and design process. Detailed descriptions of the prestressing components and systems used are also included. Prestressed Concrete Bridges is an essential reference book for both the experienced engineer and graduate who want to learn more about the subject.

Automated Design of Continuous Bridges with Precast Prestressed Concrete Beams

Automated Design of Continuous Bridges with Precast Prestressed Concrete Beams
Author: Harry L. Jones
Publisher:
Total Pages: 175
Release: 1974
Genre: Continuous bridges
ISBN:

A Computer program has been developed in this study to perform the calculations for the design of continuous prestressed concrete bridge girders. The continuous girder is constructed from simple span precast concrete I-shaped beams made continuous by supplementary reinforcing in the deck and the ends of the precast beams. Specifications for the designs produced are those currently accepted by the State Department of Highways and Public Transportation. This volume of the report contains a description of the computer program, instructions for its use and information on its structure and operation.