Factors that influence friction in tendons of unbonded post-tensioning systems
- Dundu, Morgan, Ward, Michelle
- Authors: Dundu, Morgan , Ward, Michelle
- Date: 2014
- Subjects: Tendons (Prestressed concrete) , Corrosion and anti-corrosives , Steel, Structural - Protection
- Type: Article
- Identifier: uj:5059 , ISSN 9781614994657 , ISSN 9781614994664 , http://hdl.handle.net/10210/13621
- Description: The coefficient of friction in an unbonded post tensioning system is influenced by many factors, and these factors include the thickness of lubricant or grease present in the system, clearance between the strand and the plastic sheath, surface characteristics of the strand and plastic sheath. In order to determine the effect of these factors, a series of friction tests were performed on two different diameters of strand, namely; 12.7 mm and 15.24 mm diameters. Through a regression analysis, it was found that the frictional force decreases with increase in the thickness of the grease and that friction increases with increase in the mass of the strand. The amount of friction was found to be dependent on the surface characteristics of the strand and plastic sheath, clearance between the plastic sheath and the strand and the extrusion process of the plastic sheath.
- Full Text:
- Authors: Dundu, Morgan , Ward, Michelle
- Date: 2014
- Subjects: Tendons (Prestressed concrete) , Corrosion and anti-corrosives , Steel, Structural - Protection
- Type: Article
- Identifier: uj:5059 , ISSN 9781614994657 , ISSN 9781614994664 , http://hdl.handle.net/10210/13621
- Description: The coefficient of friction in an unbonded post tensioning system is influenced by many factors, and these factors include the thickness of lubricant or grease present in the system, clearance between the strand and the plastic sheath, surface characteristics of the strand and plastic sheath. In order to determine the effect of these factors, a series of friction tests were performed on two different diameters of strand, namely; 12.7 mm and 15.24 mm diameters. Through a regression analysis, it was found that the frictional force decreases with increase in the thickness of the grease and that friction increases with increase in the mass of the strand. The amount of friction was found to be dependent on the surface characteristics of the strand and plastic sheath, clearance between the plastic sheath and the strand and the extrusion process of the plastic sheath.
- Full Text:
The effects of lubricant and tendon mass variances on the coefficient of friction in unbonded post-tensioning tendons
- Dundu, Morgan, Ward, Michelle
- Authors: Dundu, Morgan , Ward, Michelle
- Date: 2016
- Subjects: Post-tensioning , 7-wire strand , Grease
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/123366 , uj:20782 , Citation: Dundu, M & Ward, M. 2016. MENDED: The effects of lubricant and tendon mass variances on the coefficient of friction in unbonded post-tensioning tendons.
- Description: Abstract: In unbonded post-tensioning tendons, the coefficient of friction varies from one design standard to another. This variation is caused by the large number of complex factors that must be considered in design. These factors include the thickness of lubricant or grease present in the system, clearance between the strand and the plastic sheath, surface characteristics of the strand and plastic sheath. In order to determine the effect of these factors a series of friction tests were performed on two different diameters of strand, namely; 12.7mm and 15.24mm diameters. Through a regression analysis, it was found that the frictional force decreases with an increase in the thickness of the grease and that friction increases with an increase in the mass of the strand. The degree of friction was found to be dependent on the surface characteristics of the strand and plastic sheath, clearance between the plastic sheath and the strand and the extrusion process of the plastic sheath.
- Full Text:
- Authors: Dundu, Morgan , Ward, Michelle
- Date: 2016
- Subjects: Post-tensioning , 7-wire strand , Grease
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/123366 , uj:20782 , Citation: Dundu, M & Ward, M. 2016. MENDED: The effects of lubricant and tendon mass variances on the coefficient of friction in unbonded post-tensioning tendons.
- Description: Abstract: In unbonded post-tensioning tendons, the coefficient of friction varies from one design standard to another. This variation is caused by the large number of complex factors that must be considered in design. These factors include the thickness of lubricant or grease present in the system, clearance between the strand and the plastic sheath, surface characteristics of the strand and plastic sheath. In order to determine the effect of these factors a series of friction tests were performed on two different diameters of strand, namely; 12.7mm and 15.24mm diameters. Through a regression analysis, it was found that the frictional force decreases with an increase in the thickness of the grease and that friction increases with an increase in the mass of the strand. The degree of friction was found to be dependent on the surface characteristics of the strand and plastic sheath, clearance between the plastic sheath and the strand and the extrusion process of the plastic sheath.
- Full Text:
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