Shear Behavior of Spliced Post-tensioned Girders

Shear Behavior of Spliced Post-tensioned Girders
Author: Andrew Michael Moore
Publisher:
Total Pages: 500
Release: 2014
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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.


Shear Behavior of Spliced Post-tensioned Girders
Language: en
Pages: 500
Authors: Andrew Michael Moore
Categories:
Type: BOOK - Published: 2014 - Publisher:

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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 d
Analysis of the Shear Behavior of Prestressed Concrete Spliced Girders
Language: en
Pages: 412
Authors: Dhiaa Mustafa T. Al-Tarafany
Categories:
Type: BOOK - Published: 2016 - Publisher:

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Implementation of the spliced girder technology in bridges has been growing in recent years. Increased girder lengths can now be realized by splicing shorter pr
Behavior of the Cast-in-place Splice Regions of Spliced I-girder Bridges
Language: en
Pages: 786
Authors: Christopher Scott Williams
Categories:
Type: BOOK - Published: 2015 - Publisher:

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Spliced girder technology continues to attract attention due to its versatility over traditional prestressed concrete highway bridge construction. Relatively li
Laboratory Tests of Two-span Prestressed Reinforced Concrete Bridge Girders Constructed from Three Long Segments
Language: en
Pages: 280
Authors: William Leo Gamble
Categories: Concrete bridges
Type: BOOK - Published: 1979 - Publisher:

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Tests of two prestressed concrete composite bridge girders which were continuous over two spans are reported. Both were I-section girders with cast-in-place dec
Shear Capacity of Post-tensioned Concrete Girders Without Shear Reinforcement
Language: en
Pages:
Authors: Gustavo Adolfo Llanos
Categories:
Type: BOOK - Published: 2008 - Publisher:

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ABSTRACT: The objective of this study was to evaluate the behavior of post-tensioned I-girders with end blocks. The beams had two parabolic tendons and two stra