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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| 格式: | Thesis |
| 语言: | English English |
| 出版: |
1985
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| 主题: | |
| 在线阅读: | http://psasir.upm.edu.my/id/eprint/9863/1/FK_1985_1_A.pdf |
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| 总结: | 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. |
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