<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Prestress losses are usually calculated by bringing the tendons in the cross-section to the single resultant tendon. This solution is correct only for tendons concentrated in one part of the cross-section, while with their wider distribution, for example after the use of upper tendons, it may result in underestimation of losses in the lower tendons and overestimation in the upper tendons. The paper presents formulae to determine time dependent prestress losses separately for the top and bottom tendons of a pretensioned concrete member. Furthermore, variations of stress in the prestressing steel are analysed for two pretensioned concrete members to evaluate the possibility of using the equation (5.46) from the Eurocode 2 for the resultant tendon instead of the deduced formulae. The aim of this study is to show how great the error of estimated loss of prestressing force on the basis of several typical prestressed concrete sections can be.</p>
</abstract>

Prestress losses are usually calculated by bringing the tendons in the cross-section to the single resultant tendon. This solution is correct only for tendons concentrated in one part of the cross-section, while with their wider distribution, for example after the use of upper tendons, it may result in underestimation of losses in the lower tendons and overestimation in the upper tendons. The paper presents formulae to determine time dependent prestress losses separately for the top and bottom tendons of a pretensioned concrete member. Furthermore, variations of stress in the prestressing steel are analysed for two pretensioned concrete members to evaluate the possibility of using the equation (5.46) from the Eurocode 2 for the resultant tendon instead of the deduced formulae. The aim of this study is to show how great the error of estimated loss of prestressing force on the basis of several typical prestressed concrete sections can be.

EVALUATION OF TIME DEPENDENT PRESTRESS LOSSES IN PRETENSIONED CONCRETE MEMBER WITH TOP AND BOTTOM TENDONS

Architecture, Civil Engineering, Environment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Prestress losses are usually calculated by bringing the tendons in the cross-section to the single resultant tendon. This solution is correct only for tendons...

	The rectangular beam	The I-shaped beam
The span L (m)	15	21
The load q (kN/m)	9	25
The perimeter of the member in contact with the atmosphere (m)	2.2	4.76

EVALUATION OF TIME DEPENDENT PRESTRESS LOSSES IN PRETENSIONED CONCRETE MEMBER WITH TOP AND BOTTOM TENDONS

Article Category: research-article

Pubblicato online: 18 ott 2019

Pagine: 105 - 112

Ricevuto: 23 apr 2019

Accettato: 27 giu 2019

DOI: https://doi.org/10.21307/acee-2019-040

Parole chiave
Creep, Prestress losses, Pretensioned concrete member, Relaxation, Shrinkage, Stress in prestressing reinforcement, Tendons

© 2019 Vadzim PARKHATS et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Parameters of the analysed members

EVALUATION OF TIME DEPENDENT PRESTRESS LOSSES IN PRETENSIONED CONCRETE MEMBER WITH TOP AND BOTTOM TENDONS

Article Category: research-article

Pubblicato online: 18 ott 2019

Pagine: 105 - 112

Ricevuto: 23 apr 2019

Accettato: 27 giu 2019

DOI: https://doi.org/10.21307/acee-2019-040

Parole chiaveCreep, Prestress losses, Pretensioned concrete member, Relaxation, Shrinkage, Stress in prestressing reinforcement, Tendons

© 2019 Vadzim PARKHATS et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Parameters of the analysed members

Parole chiave
Creep, Prestress losses, Pretensioned concrete member, Relaxation, Shrinkage, Stress in prestressing reinforcement, Tendons