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Title: Finite element study of cracked steel circular tube repaired by FRP patching
Authors: Lam, CC
Cheng, JJ
Yam, CH 
Keywords: Cracked steel structures
Fatigue repair
Finite element analysis
Issue Date: 2011
Publisher: Elsevier
Source: Procedia engineering, 2011, v. 14, p. 1106-1113 How to cite?
Journal: Procedia engineering 
Abstract: As the development and application of fiber reinforced polymer (FRP) composite materials to different engineering structures are increasing gradually, composite fiber patching techniques are being considered as alternatives to traditional methods of strengthening and fatigue crack repair in steel structures, such as the boom members of draglines. In general, the dragline boom members are in the form of circular tube type structure, therefore, application of FRP patching is usually bonded on one side (the outside surface) of the tube structure. In order to examine the efficiency of the repair by single-side patching of FRP material to tube structures, finite element study of cracked steel tube structure is conducted. The objectives of the finite element study are (1) to study the reduction of stress intensity factor (SIF) of cracked steel tube member repaired with FRP patching and (2) to predict the fatigue life of welded steel tube member repaired with FRP patching. The cracked steel circular tube was modeled by using 3-D brick elements and the adhesive and FRP patching were modeled by using shell elements. The adherend stiffness ratio (Efrp tfrp / Es ts) of this study is about 0.34. Comparison of the SIF of cracked steel circular tube with and without FRP patching showed that the SIF was reduced significantly for models with FRP patching and the reduction was more than 50%. Prediction of the fatigue life of cracked circular tube member with and without FRP patching was carried out by means of the Paris equation. Due to the significant reduction of SIF for members with FRP patching, it is shown that the corresponding predicted fatigue life is increased significantly as well. In particular, the increase of fatigue life is about 22 times for model with CFRP sheet patching when the circumference half crack length grows from 25.4 mm (1 inch) to 63.5 mm (2.5 inch).
Description: 12th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC12, Hong Kong, 26-28 January 2011
EISSN: 1877-7058
DOI: 10.1016/j.proeng.2011.07.139
Rights: © 2011 Published by Elsevier Ltd. Open access under the CC BY-NC-ND license (
Selection and/or peer-review under responsibility of [name organizer]
The following publication Lam, C. C., Cheng, J. J., & Yam, C. H. (2011). Finite element study of cracked steel circular tube repaired by FRP patching. Procedia engineering, 2011, 14, 1106-1113 is available at
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