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Shear tests on continuous prestressed concrete beams with external prestressing
Structural Concrete, 2015AbstractAccording to current design codes, many existing road bridges exhibit shear capacity deficits. This is partly due to increased traffic loads and partly due to changes in the code provisions. In order to extend the service lives of these bridges, either refined design approaches may be used or strengthening measures performed.
Martin Herbrand, Martin Classen
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External Prestressing Technique for Strengthening of Prestressed Concrete Structural Components
Practice Periodical on Structural Design and Construction, 2009This paper presents the details of an innovative external prestressing technique for strengthening of prestressed concrete girders. The technique has been developed for anchoring the external prestressing to the sides of the end block. In the proposed technique, transfer of external force is in shear mode on the end block and the required transverse ...
S. Saibabu +5 more
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Calculating stress of external prestressing tendons
Structures <html_ent glyph="@amp;" ascii="&"/> Buildings, 2004This paper presents a simple method to calculate the increase in stress of the external prestressing tendons used to strengthen the concrete beams at any loading. First, the previous equations used to calculate stress of unbonded or external prestressing tendons are briefly reviewed, and then a new design method is proposed by considering deformation ...
A. Ghallab, A. W. Beeby
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Journal of the Korea Concrete Institute, 2004
This study deals with literature review, developing a predicting equation for the ultimate stress of internal and external prestressing steel, and an experimental test with the parameters affecting the ultimate stress of prestressing steel in prestressed concrete beams strengthened by external prestressing tendons.
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This study deals with literature review, developing a predicting equation for the ultimate stress of internal and external prestressing steel, and an experimental test with the parameters affecting the ultimate stress of prestressing steel in prestressed concrete beams strengthened by external prestressing tendons.
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Testing of externally prestressed concrete beams
Engineering Structures, 2002This paper presents the results of a test program on externally prestressed concrete beams. Five monolithic and three segmental beams were tested in bending and in combined bending and shear. The most significant results are presented such as carrying capacity, prestressing steel stress increase at ultimate, shear behavior of open joints.
Angel C Aparicio +2 more
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Structural Strengthening by External Prestressing
1990This paper deals with some examples of activities of the Service d’Etudes des Structures (C.E.B.T.P., France) related to the problem of bridge rehabilitation. This involvement is approached on two levels: a) applied research works carried out in laboratories, and b) investigations performed on some actual bridges, in view of their strengthening by use ...
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Effect of Shear in Externally Prestressed Beams
ACI Structural Journal, 1998Seven T-beams, post-tensioned with straight tendons, were tested to failure to investigate the effect of concrete strength, shear reinforcement, and shear span on the failure mode of externally prestressed beams. Each beam was fabricated with a deviator at the midspan and tested under simply supported conditions.
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Numerical simulation of an external prestressing technique for prestressed concrete end block
Structural Engineering and Mechanics, 2009This paper presents the details of finite element (FE) modeling and analysis of an external prestressing technique to strengthen a prestressed concrete (PSC) end block. Various methods of external prestressing techniques have been discussed. In the proposed technique, transfer of external force is in shear mode on the end block creating a complex ...
A. Rama Chandra Murthy +5 more
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Estimation Method for Prestress Loss of Externally Prestressed Composite Girder Bridges
Advanced Materials Research, 2014To accurately calculate the prestress of externally prestressed composite girder bridges, the six critical factors (the prestressing tendon withdrawal and anchor deformation, friction between prestressing tendon and deviator, prestressing tendon relaxation, concrete creep, concrete shrinkage and temperature changes) that cause the prestress loss of ...
Yong Ming Zhao +2 more
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ANCHORAGE OF ADDITIONAL EXTERNAL PRESTRESSING TENDONS
2005An important problem in the application of external prestressing to strengthen older concrete bridge superstructures is to introduce high concentrated prestressing forces safely into the existing superstructure. The additional longitudinal prestressing tendons are often anchored in a block made of reinforced concrete, which is fixed to the ...
Wilhelm Buschmeyer, Michael Zech
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