1. Tightening Torque Influence on Pullout Behavior of Post-installed Expansion Anchors
- Author
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Fabien Delhomme, Nicolas Rouane, Bertrand Pallud, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), and Hilti France
- Subjects
pullout test ,Load capacity ,anchor ,business.industry ,0211 other engineering and technologies ,020101 civil engineering ,02 engineering and technology ,Structural engineering ,Reinforced concrete ,creep ,0201 civil engineering ,[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering ,Tension response ,021105 building & construction ,concrete ,Torque ,prestress ,[SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures ,business ,Slipping ,Geology ,Civil and Structural Engineering - Abstract
International audience; Post-installed anchors in reinforced concrete structures are increasingly important in current constructions especially in repair or upgrading works. A research program was completed to determine the influence of the tightening torque and the anchorage depth on the pullout performances of torque-controlled expansion anchors. The diameter d of the tested anchors was 10 mm. Six configurations were tested on 18 concrete blocks. Three pre-tension loads and two anchorage depths were considered. The results show that the fastening torque has no influence on the load-bearing capacity far away from the edges. However, an increase of the torque leads to a decrease of the anchor’s slipping during pullout tests. Nevertheless, applying an excessive fastening torque may lead to a steel-rupture of the anchor during the fastening phase. An increase of the anchorage depth leads to a better load capacity of the anchor and reduces the risk of concrete cone rupture. Finally, a simplified model of the tension response of the anchor with a bilinear load-displacement relationship has been suggested.
- Published
- 2018
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