|Analytical modeling of self-stressed steel fiber reinforced concrete encased steel penstock subjected to internal water pressure
|Hong Kong Polytechnic University -- Dissertations
Penstocks -- Design and construction
Penstocks -- Mathematical models.
Reinforced concrete -- Mathematical models.
|Department of Civil and Structural Engineering
|vi, 82 leaves : ill. ; 30 cm.
|Reinforced concrete (RC) encased steel penstocks (RC-ESPs) are usually laid on the downstream surfaces of dams. In order to control the crack, steel fiber reinforced concrete (SFRC) and self-stressed steel fiber reinforced concrete (SS-SFRC) can be introduced to replace conventional concrete in the exterior RC walls because of their excellent performance in tension. Up to now, there is no well-recognized design method for reinforced concrete encased steel penstocks (RC-ESPs). Furthermore, research on steel fiber reinforced concrete encased steel penstocks (SFRC-ESPs) and self-stressed steel fiber reinforced concrete encased steel penstocks (SS-SFRC-ESPs) is much more limited. This dissertation, therefore, presents an explicit model to predict the structural performances of SFRC-ESPs and SS-SFRC-ESPs for both serviceability and safety design. The structural performances mainly consist of the stress/strain conditions of the encased steel penstock and the steel reinforcements, the radial displacement and crack width of exterior concrete wall in SFRC-ESPs and SS-SFRC-ESPs under internal water pressure. The results predicted by the new approach model agree well with the experimental results. As a conclusion, the new method provides a reasonable, effective and accurate prediction of structural performances of SFRC-ESPs and SS-SFRC-ESPs.
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