When analysing slip resistance connections, which are commonly used in-situ assemblied joints of structures dominantly loaded by cyclic loading, for example in bridges, telecommunication towers, towers for wind turbines, we may say that preloaded high strength bolts are their most important part. A level of pretension force in a bolt influences the strength of a slip resistance connection, therefore it is very important to attain a design level of a pretension force. This paper tackles most frequently used methods for measuring of a pretension force in high strength bolts both on site and in a laboratory. Primarily usage of ultrasonic methods, washer like load cells (with strain gauges and piezoelectric), strain gauges installed on the bolt shank and strain gauges installed inside of the bolt shank. The emphasis is both on a use of strain gauges which measure pretension force inhigh strength bolts and on a bolt calibration procedure prior to pretensioning. Installation process of strai...n gauges in the bolt shank is described in detail and all its specificities are bring to the attention based experimental research conducted on 126 bolts.
Keywords:
Strain gauge / high strength bolt / measurement of pretension force / calibration / calibration curve
Source:
International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015., 2015
TY - CONF
AU - Fric, Nenad
AU - Buđevac, Dragan V.
AU - Mišković, Zoran
AU - Veljković, Milan B.
AU - Marković, Zlatko A.
AU - Dobrić, Jelena D.
PY - 2015
UR - http://grafar.grf.bg.ac.rs/handle/123456789/1952
AB - When analysing slip resistance connections, which are commonly used in-situ assemblied joints of structures dominantly loaded by cyclic loading, for example in bridges, telecommunication towers, towers for wind turbines, we may say that preloaded high strength bolts are their most important part. A level of pretension force in a bolt influences the strength of a slip resistance connection, therefore it is very important to attain a design level of a pretension force. This paper tackles most frequently used methods for measuring of a pretension force in high strength bolts both on site and in a laboratory. Primarily usage of ultrasonic methods, washer like load cells (with strain gauges and piezoelectric), strain gauges installed on the bolt shank and strain gauges installed inside of the bolt shank. The emphasis is both on a use of strain gauges which measure pretension force inhigh strength bolts and on a bolt calibration procedure prior to pretensioning. Installation process of strain gauges in the bolt shank is described in detail and all its specificities are bring to the attention based experimental research conducted on 126 bolts.
C3 - International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015.
T1 - Calibration of the high strenght bolts for measuring of the pretension force
ER -
@conference{
author = "Fric, Nenad and Buđevac, Dragan V. and Mišković, Zoran and Veljković, Milan B. and Marković, Zlatko A. and Dobrić, Jelena D.",
year = "2015",
abstract = "When analysing slip resistance connections, which are commonly used in-situ assemblied joints of structures dominantly loaded by cyclic loading, for example in bridges, telecommunication towers, towers for wind turbines, we may say that preloaded high strength bolts are their most important part. A level of pretension force in a bolt influences the strength of a slip resistance connection, therefore it is very important to attain a design level of a pretension force. This paper tackles most frequently used methods for measuring of a pretension force in high strength bolts both on site and in a laboratory. Primarily usage of ultrasonic methods, washer like load cells (with strain gauges and piezoelectric), strain gauges installed on the bolt shank and strain gauges installed inside of the bolt shank. The emphasis is both on a use of strain gauges which measure pretension force inhigh strength bolts and on a bolt calibration procedure prior to pretensioning. Installation process of strain gauges in the bolt shank is described in detail and all its specificities are bring to the attention based experimental research conducted on 126 bolts.",
journal = "International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015.",
title = "Calibration of the high strenght bolts for measuring of the pretension force"
}
Fric, N., Buđevac, D. V., Mišković, Z., Veljković, M. B., Marković, Z. A.,& Dobrić, J. D.. (2015). Calibration of the high strenght bolts for measuring of the pretension force. in International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015..
Fric N, Buđevac DV, Mišković Z, Veljković MB, Marković ZA, Dobrić JD. Calibration of the high strenght bolts for measuring of the pretension force. in International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015.. 2015;..
Fric, Nenad, Buđevac, Dragan V., Mišković, Zoran, Veljković, Milan B., Marković, Zlatko A., Dobrić, Jelena D., "Calibration of the high strenght bolts for measuring of the pretension force" in International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015. (2015).
