2013 Fiscal Year Final Research Report
Bond Characteristics of Prestressing Tendons within Pre-tensioned Prestressed Concrete Members Damaged by a Fire and Evaluation of Their Residual Load Carrying Capacity
| Project/Area Number |
23560558
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Civil engineering materials/Construction/Construction management
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| Research Institution | Osaka Institute of Technology |
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Principal Investigator |
INOUE SUSUMU 大阪工業大学, 工学部, 教授 (30168447)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 火害 / PC鋼材 / 高温履歴 / 付着 / 残存プレストレス / 残存耐荷力 / プレテンション部材 / 熱伝導解析 |
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| Research Abstract |
Bond strength between concrete and prestressing tendons, as well as residual prestress and load carrying capacity of pre-tensioned prestressed concrete beams decreased due to the effect of high temperature exposure by a fire. These decreasing ratio became larger with increasing in applied temperature and exposure time, and with decreasing in concrete cover.
On the other hand, an increase in concrete cover thickness could restrain the enhancement of temperature in prestressing tendons and mitigate the reduction in bond strength and load carrying capacity. Especially, in the case of 70mm concrete cover, load carrying capaciry scarcely decreased even when subjected to 30 minutes heating up to 1100 degree centigrade.
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