Service Limit Criteria for Deflection and Cracking in Partially Prestressed Beams
This thesis has been concerned with the primary objective of studying the serviceability behavior of partially prestressed concrete beams. Seven simply supported rectangular beams were tested on an effective span of 2.745 m subjected to two third point loadings. The variables were the amount of...
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1985
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my-upm-ir.98632011-02-24T07:22:05Z Service Limit Criteria for Deflection and Cracking in Partially Prestressed Beams 1985-11 Alam, Khondaker Shamsul This thesis has been concerned with the primary objective of studying the serviceability behavior of partially prestressed concrete beams. Seven simply supported rectangular beams were tested on an effective span of 2.745 m subjected to two third point loadings. The variables were the amount of prestressing wires and ordinary reinforcement steel. The effect of bond was also investigated. Four beams were fully bonded by using pressurised grouting while three other beams were tested unbonded. Crack widths and deflections were recorded at various loadings, and crack propagations observed. The results obtained were compared with theoretical values proposed by various authors. Results were also compared with the service limit criteria for cracking and deflection according to the British Standards code of practice, CP 110:1972. It was observed that the service limit criteria for cracking and deflection as set out by the code are too conservative for rectangular beams tested. It was found that the existing theory greatly underestimates the ultimate as well as service load carrying capacity and overestimates crack widths of partially prestressed concrete beams. It was also found that the nature of bonding has a great influence on crack widths and deflections. Bonded beams greatly improve on serviceability by having increased load carrying capacity and reduced crack width. Concrete beams - Cracking Prestressed concrete beams 1985-11 Thesis http://psasir.upm.edu.my/id/eprint/9863/ http://psasir.upm.edu.my/id/eprint/9863/1/FK_1985_1_A.pdf application/pdf en public masters Universiti Pertanian Malaysia Concrete beams - Cracking Prestressed concrete beams Faculty of Engineering English |
| institution |
Universiti Putra Malaysia |
| collection |
PSAS Institutional Repository |
| language |
English English |
| topic |
Concrete beams - Cracking Prestressed concrete beams |
| spellingShingle |
Concrete beams - Cracking Prestressed concrete beams Alam, Khondaker Shamsul Service Limit Criteria for Deflection and Cracking in Partially Prestressed Beams |
| description |
This thesis has been concerned with the primary objective of
studying the serviceability behavior of partially prestressed concrete
beams. Seven simply supported rectangular beams were tested on an
effective span of 2.745 m subjected to two third point loadings. The
variables were the amount of prestressing wires and ordinary reinforcement
steel. The effect of bond was also investigated. Four beams
were fully bonded by using pressurised grouting while three other beams
were tested unbonded.
Crack widths and deflections were recorded at various loadings,
and crack propagations observed. The results obtained were compared with theoretical values proposed by various authors. Results were
also compared with the service limit criteria for cracking and
deflection according to the British Standards code of practice, CP
110:1972.
It was observed that the service limit criteria for cracking and
deflection as set out by the code are too conservative for rectangular
beams tested. It was found that the existing theory greatly underestimates
the ultimate as well as service load carrying capacity and
overestimates crack widths of partially prestressed concrete beams.
It was also found that the nature of bonding has a great influence on
crack widths and deflections. Bonded beams greatly improve on serviceability
by having increased load carrying capacity and reduced crack
width. |
| format |
Thesis |
| qualification_level |
Master's degree |
| author |
Alam, Khondaker Shamsul |
| author_facet |
Alam, Khondaker Shamsul |
| author_sort |
Alam, Khondaker Shamsul |
| title |
Service Limit Criteria for Deflection and Cracking in Partially Prestressed Beams
|
| title_short |
Service Limit Criteria for Deflection and Cracking in Partially Prestressed Beams
|
| title_full |
Service Limit Criteria for Deflection and Cracking in Partially Prestressed Beams
|
| title_fullStr |
Service Limit Criteria for Deflection and Cracking in Partially Prestressed Beams
|
| title_full_unstemmed |
Service Limit Criteria for Deflection and Cracking in Partially Prestressed Beams
|
| title_sort |
service limit criteria for deflection and cracking in partially prestressed beams |
| granting_institution |
Universiti Pertanian Malaysia |
| granting_department |
Faculty of Engineering |
| publishDate |
1985 |
| url |
http://psasir.upm.edu.my/id/eprint/9863/1/FK_1985_1_A.pdf |
| _version_ |
1747811009469349888 |