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Improving fatigue performance of CFRP strengthened steel beams by applying vacuum pressure in the wet layup of CFRP woven sheets
Citation
Jiao, H and Zhao, X-L and Mashiri, F, Improving fatigue performance of CFRP strengthened steel beams by applying vacuum pressure in the wet layup of CFRP woven sheets, Proceedings of the 3rd Asia-Pacific Conference on FRP in Structures, 2-4 February, Hokkaido University, Japan, pp. F2B03:1-6. (2012) [Refereed Conference Paper]
Copyright Statement
Copyright 2012 International Institute for FRP in Construction
Official URL: http://www.iifc-hq.org/proceedings/APFIS_2012/inde...
Abstract
Multiple layers of CFRP woven sheets are generally laminated through a wet layup process
with epoxies being evenly distributed in each layer of CFRP sheets. Although attempts
were made by researchers to evenly distribute epoxy resin in CFRP layers, the bonding
quality is not easily controlled. Air bubbles or excessive epoxy resin may exist in hardened
CFRP composites. As a result, the bonding strength may be affected. For the two types of
CFRP materials that are commonly used in the strengthening of defected steel structures,
CFRP woven sheets are required for curved sections, such as truck chassis and circular
sections. The difference in the layup process of CFRP plates and CFRP sheets may
contribute to the difference in fatigue life of repaired steel members. In this study, a
vacuum bag was used to provide a negative pressure to suck out excessive epoxy resins and
air bubbles during the wet layup process. The failure modes and fatigue life of steel beams
strengthened with and without vacuum bags were compared. An increase in fatigue life was
found to be ranging from 50% to nearly 4 times.
Item Details
Item Type: | Refereed Conference Paper |
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Keywords: | wet-layup, vacuum bag, fatigue life, steel beam, CFRP woven sheets |
Research Division: | Engineering |
Research Group: | Civil engineering |
Research Field: | Structural engineering |
Objective Division: | Construction |
Objective Group: | Other construction |
Objective Field: | Other construction not elsewhere classified |
UTAS Author: | Jiao, H (Dr Hui Jiao) |
ID Code: | 76214 |
Year Published: | 2012 |
Deposited By: | Engineering |
Deposited On: | 2012-03-01 |
Last Modified: | 2018-03-16 |
Downloads: | 3 View Download Statistics |
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