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International Concrete Abstracts Portal

Showing 1-5 of 8 Abstracts search results

Document: 

SP113-04

Date: 

April 1, 1989

Author(s):

J. A. Burgess, J. E. Breen and R. W. Poston

Publication:

Symposium Papers

Volume:

113

Abstract:

An experimental investigation was conducted to examine cracking of post-tensioned bridge deck anchorage zones with closely spaced anchors. The test program included full-scale tests of bridge deck anchorage zones with single and closely spaced anchorages. Half of the test specimens contained additional spiral anchorage zone reinforcement. The test results indicate that when the anchorages are closely spaced, a previously stressed anchor tends to precompress the anchorage zone of an adjacent anchor and slightly increases its cracking load. In heavily reinforced bridge decks, additional spiral anchorage zone reinforcement provides only a slight to moderate increase in the anchorage zone cracking or ultimate load. Predicted cracking loads based on ACI-PTI's allowable stress provisions were generally conservative for single and closely spaced bridge deck anchorages.

DOI:

10.14359/3000


Document: 

SP113-07

Date: 

April 1, 1989

Author(s):

B. O. Aalami and F. G. Barth

Publication:

Symposium Papers

Volume:

113

Abstract:

Based on extensive observations and a survey of the performance of unbonded post-tensioned buildings, paper presents a categorization of the common cracks in beams and slabs, and the principal causes of crack formation due to restraining effects of supporting structures are discussed in detail. Current methods of crack formation control are also presented and evaluated, and the consequences of cracks on serviceability and strength of post-tensioned buildings are reviewed. In addition, recommendations are made for crack mitigation and maintenance of buildings that are post-tensioned with unbonded tendons.

DOI:

10.14359/3006


Document: 

SP113

Date: 

April 1, 1989

Author(s):

Editors: Grant T. Halvorsen and Ned H. Burns

Publication:

Symposium Papers

Volume:

113

Abstract:

SP113 Cracking in Prestressed Concrete Structures has been compiled to provide further insight into the problems and solutions of cracking in prestressed concrete." This ACI Special Publication consists of seven papers reflecting the perspectives of both research and practice. Cracking in Prestressed Concrete Structures provides the know-how you need to build durable, crack-free, prestressed concrete structures.

DOI:

10.14359/14146


Document: 

SP113-02

Date: 

April 1, 1989

Author(s):

M. H. Harajli and A. E. Naaman

Publication:

Symposium Papers

Volume:

113

Abstract:

Study was conducted to evaluate cracking in partially prestressed concrete beams under both static and cyclic fatigue loading. It comprises two parts: an experimental investigation and an analytical modeling of crack width increase under cyclic fatigue loading. In the experimental part, 12 different sets of beams were tested in four-point bending. Each set comprised two identical beams. One beam was tested to failure under monotonically increasing load, while the second beam was tested in fatigue at a constant load range simulating full live load. In the analytical part of the study, a model for computing the increase in crack width under cyclic fatigue loading is developed. The model accounts for the effect of change in steel stress due to cyclic creep of concrete in compression, the increase in slip due to bond redistribution, concrete shrinkage, and cyclic creep of concrete in tension. Results predicted by the model were found to be in good agreement with the experimental results observed in this study, as well as results reported elsewhere.

DOI:

10.14359/2998


Document: 

SP113-06

Date: 

April 1, 1989

Author(s):

P. R. Chadrabarti

Publication:

Symposium Papers

Volume:

113

Abstract:

An attempt is made to study the crack formation, crack propagation, and the postcracking behavior until failure of four-panel prestressed concrete flat plates having two-way continuous parabolically draped unbonded post-tensioning tendons. The test specimens closely simulate the corner panels of an actual flat plate floor system having simple supports along the edges. The simple support system is similar to that provided by ledger beams or walls. The effect of added mild steel on the crack initiation, crack propagation, crack width control, and postcracking behavior is also studied. Recommendations are also made for further research.

DOI:

10.14359/3003


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