Details
| Original language | English |
|---|---|
| Article number | 04021015 |
| Journal | Journal of Composites for Construction |
| Volume | 25 |
| Issue number | 3 |
| Publication status | Published - 1 Jun 2021 |
| Externally published | Yes |
Abstract
In this study, a mechanical anchorage for prestressed carbon fiber-reinforced polymer (CFRP) rods was proposed. The proposed anchorage consisted of a steel barrel with a conical hole and three separate aluminum wedges that are in direct contact with the CFRP rod. The anchorage system relied only upon friction, without any adhesives required. The static and fatigue behaviors of the anchor were experimentally investigated according to the European guidelines for testing post-tensioning kits and fulfilled their requirements. The average tensile strength of the anchorage system for the 8-mm CFRP rods was 2,371.4 MPa, being greater than the guaranteed value of 2,047 MPa. The fatigue tests revealed that the wedge seating distance (prior to pulling the rod) significantly affected the occurrence of slippage between the anchor components. Therefore, a new displacement-controlled presetting system was developed to ensure adequate wedge seating distance. It eliminated the need for hydraulic jacks and demonstrated the capability of applying presetting forces greater than 110 kN. Furthermore, the anchors were tested under loading frequencies of 5, 17, and 23 Hz. The proposed anchorage was observed to be insensitive to the loading frequency because no slippage or temperature rise occurred under these loading frequencies.
Keywords
- CFRP tendon, Fatigue, Post-tensioning, Strengthening, Wedge-barrel anchor
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Journal of Composites for Construction, Vol. 25, No. 3, 04021015, 01.06.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Development of a Mechanical Wedge-Barrel Anchor for CFRP Rods
T2 - Static and Fatigue Behaviors
AU - Heydarinouri, Hossein
AU - Motavalli, Masoud
AU - Nussbaumer, Alain
AU - Ghafoori, Elyas
N1 - Funding Information: The authors acknowledge the Innosuisse Swiss Innovation Agency (Grant No. 19240.1 PFIW-IW) for funding this research project. The authors acknowledge the financial and technical support from the project partners, namely, S&P Clever Reinforcement Company AG, Switzerland; the Swiss Federal Railways (SBB) AG, Bern, Switzerland; and dsp Ingenieure + Planer AG Engineering Office, Uster, Switzerland. Publisher Copyright: © 2021 American Society of Civil Engineers.
PY - 2021/6/1
Y1 - 2021/6/1
N2 - In this study, a mechanical anchorage for prestressed carbon fiber-reinforced polymer (CFRP) rods was proposed. The proposed anchorage consisted of a steel barrel with a conical hole and three separate aluminum wedges that are in direct contact with the CFRP rod. The anchorage system relied only upon friction, without any adhesives required. The static and fatigue behaviors of the anchor were experimentally investigated according to the European guidelines for testing post-tensioning kits and fulfilled their requirements. The average tensile strength of the anchorage system for the 8-mm CFRP rods was 2,371.4 MPa, being greater than the guaranteed value of 2,047 MPa. The fatigue tests revealed that the wedge seating distance (prior to pulling the rod) significantly affected the occurrence of slippage between the anchor components. Therefore, a new displacement-controlled presetting system was developed to ensure adequate wedge seating distance. It eliminated the need for hydraulic jacks and demonstrated the capability of applying presetting forces greater than 110 kN. Furthermore, the anchors were tested under loading frequencies of 5, 17, and 23 Hz. The proposed anchorage was observed to be insensitive to the loading frequency because no slippage or temperature rise occurred under these loading frequencies.
AB - In this study, a mechanical anchorage for prestressed carbon fiber-reinforced polymer (CFRP) rods was proposed. The proposed anchorage consisted of a steel barrel with a conical hole and three separate aluminum wedges that are in direct contact with the CFRP rod. The anchorage system relied only upon friction, without any adhesives required. The static and fatigue behaviors of the anchor were experimentally investigated according to the European guidelines for testing post-tensioning kits and fulfilled their requirements. The average tensile strength of the anchorage system for the 8-mm CFRP rods was 2,371.4 MPa, being greater than the guaranteed value of 2,047 MPa. The fatigue tests revealed that the wedge seating distance (prior to pulling the rod) significantly affected the occurrence of slippage between the anchor components. Therefore, a new displacement-controlled presetting system was developed to ensure adequate wedge seating distance. It eliminated the need for hydraulic jacks and demonstrated the capability of applying presetting forces greater than 110 kN. Furthermore, the anchors were tested under loading frequencies of 5, 17, and 23 Hz. The proposed anchorage was observed to be insensitive to the loading frequency because no slippage or temperature rise occurred under these loading frequencies.
KW - CFRP tendon
KW - Fatigue
KW - Post-tensioning
KW - Strengthening
KW - Wedge-barrel anchor
UR - http://www.scopus.com/inward/record.url?scp=85103165733&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)CC.1943-5614.0001124
DO - 10.1061/(ASCE)CC.1943-5614.0001124
M3 - Article
AN - SCOPUS:85103165733
VL - 25
JO - Journal of Composites for Construction
JF - Journal of Composites for Construction
SN - 1090-0268
IS - 3
M1 - 04021015
ER -