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A platform for research: civil engineering, architecture and urbanism
Theoretical study on short-term and long-term deflections of fiber reinforced polymer prestressed concrete beams
This paper presents the methods for predicting the short-term and time-dependent derflections of fully or partially prestressed concrete beams with fiber reinforced polymer (FRP) tendons under sustained bending moment and axial force. The age-adjusted effective modulus method is used to model the creep behaviour in the concrete and the relaxation in the FRP prestressing tendons. A tension stiffeing model is proposed to evaluate the stiffness of the section after cracking. The eperimental results show that beams prestressed with FRP tendons performed in a similar manner as those with steel tendons and the long-term deflections generally give satisfactory performance under the serviceability limits. For uncracked beams, good prediction of the long-term deflection is achieved using the age-adjusted effective modulus method (AEMM) for the beams prestressed with FRP tendons. For cracked beams, tension stiffening is an important criteria in predicting the load-deflection response of beams after cracking. It is important to include concrete tension stiffening in deflection calculations. If concrete tension stiffening is taken into account, the calculated values are comparable to the experimental results. The proposed concrete tension stiffening model, which includes a material parameter beta3 in the equation, is suitable for predicting the instantaneous and the time-dependent deflections of cracked concrete beams prestressed with FRP tendons.
Theoretical study on short-term and long-term deflections of fiber reinforced polymer prestressed concrete beams
This paper presents the methods for predicting the short-term and time-dependent derflections of fully or partially prestressed concrete beams with fiber reinforced polymer (FRP) tendons under sustained bending moment and axial force. The age-adjusted effective modulus method is used to model the creep behaviour in the concrete and the relaxation in the FRP prestressing tendons. A tension stiffeing model is proposed to evaluate the stiffness of the section after cracking. The eperimental results show that beams prestressed with FRP tendons performed in a similar manner as those with steel tendons and the long-term deflections generally give satisfactory performance under the serviceability limits. For uncracked beams, good prediction of the long-term deflection is achieved using the age-adjusted effective modulus method (AEMM) for the beams prestressed with FRP tendons. For cracked beams, tension stiffening is an important criteria in predicting the load-deflection response of beams after cracking. It is important to include concrete tension stiffening in deflection calculations. If concrete tension stiffening is taken into account, the calculated values are comparable to the experimental results. The proposed concrete tension stiffening model, which includes a material parameter beta3 in the equation, is suitable for predicting the instantaneous and the time-dependent deflections of cracked concrete beams prestressed with FRP tendons.
Theoretical study on short-term and long-term deflections of fiber reinforced polymer prestressed concrete beams
Theoretische Untersuchung zu kurz- und langzeitigen Durchbiegungen von mit faserverstärkten Kuststoffen armierten Spannbetonträgern
Zou, P.X.W. (author)
Journal of Composites for Construction ; 7 ; 285-291
2003
7 Seiten, 10 Bilder, 2 Tabellen, 9 Quellen
Article (Journal)
English
| British Library Online Contents | 2003
Short- and Long-Term Deflections in Reinforced, Prestressed, and Composite Concrete Beams
| Online Contents | 2007
Short- and Long- Term Deflections in Reinforced, Prestressed, and Composite Concrete Beams
| British Library Online Contents | 2007
Long term deflections of reinforced concrete beams
| TIBKAT | 1969