Time-Dependent Behavior of Reinforced Concrete Beams under Sustained and Repeated Loading
The current study aims to highlight the loading
characteristics impact on the time evolution (focusing particularly on
long term effects) of the deformation of realized reinforced concrete
beams. Namely the tension stiffening code provisions (i.e. within
Eurocode 2) are reviewed with a clear intention to reassess their
operational value and predicting capacity. In what follows the
experimental programme adopted along with some preliminary
findings and numerical modeling attempts are presented. For a range of long slender reinforced concrete simply supported
beams (4200 mm) constant static sustained and repeated cyclic
loadings were applied mapping the time evolution of deformation.
All experiments were carried out at the Heavy Structures Lab of the
University of Leeds. During tests the mid-span deflection, creep
coefficient and shrinkage strains were monitored for duration of 90
days. The obtained results are set against the values predicted by
Eurocode 2 and the tools within an FE commercial package (i.e.
Midas FEA) to yield that existing knowledge and practise is at times
over-conservative.
[1] Scott, R.H. and A.W. Beeby, Long-term tension-stiffening effects in
concrete. Aci Structural Journal, 2005. 102(1): p. 31-39.
[2] Pirayeh Gar, S., M. Head, and S. Hurlebaus, Tension Stiffening in
Prestressed Concrete Beams Using Moment-Curvature Relationship.
Journal of Structural Engineering, 2011. 138(8): p. 1075-1078.
[3] Beeby, A.W. and R.H. Scott, Mechanisms of long-term decay of tension
stiffening. Magazine of Concrete Research, 2006. 58(5): p. 255-266.
[4] Higgins, L., et al.., Behaviour of cracked reinforced concrete beams
under repeated and sustained load types. Engineering Structures, 2013.
56(0): p. 457-465.
[5] Zanuy, C., P. de la Fuente, and L. Albajar, Estimation of parameters
defining negative tension stiffening. Engineering Structures, 2010.
32(10): p. 3355-3362.
[6] Whaley, C. and A. Neville, Non-elastic deformation of concrete under
cyclic compression. Magazine of Concrete Research, 1973. 25(84): p.
145-154.
[7] Gribniak, V., et al.., Long-term deflections of reinforced concrete
elements: accuracy analysis of predictions by different methods.
Mechanics of Time-Dependent Materials, 2013. 17(3): p. 297-313.
[8] Eurocode 2, Design of Concrete Structures. 1992: ENV 1992-1-1.
[9] Domone, P.L. and J.M. Illston, eds. Construction Materials: Their
Nature and Behaviour. Fourth edition ed. 2010, Spon Press: London.
[10] Acker, P. and F.-J. Ulm, Creep and shrinkage of concrete: physical
origins and practical measurements. Nuclear Engineering and Design,
2001. 203(2–3): p. 143-158.
[11] Nawy, E.G., Concrete construction engineering handbook. 2010: CRC
press.
[12] Deflection of Cracked RC Beams under Sustained Loading. Journal of
Structural Engineering, 2000. 126(6): p. 708-716.
[13] Du béton, F., CEB-FIP Model Code 1990: Design Code. 1993: T.
Telford.
[1] Scott, R.H. and A.W. Beeby, Long-term tension-stiffening effects in
concrete. Aci Structural Journal, 2005. 102(1): p. 31-39.
[2] Pirayeh Gar, S., M. Head, and S. Hurlebaus, Tension Stiffening in
Prestressed Concrete Beams Using Moment-Curvature Relationship.
Journal of Structural Engineering, 2011. 138(8): p. 1075-1078.
[3] Beeby, A.W. and R.H. Scott, Mechanisms of long-term decay of tension
stiffening. Magazine of Concrete Research, 2006. 58(5): p. 255-266.
[4] Higgins, L., et al.., Behaviour of cracked reinforced concrete beams
under repeated and sustained load types. Engineering Structures, 2013.
56(0): p. 457-465.
[5] Zanuy, C., P. de la Fuente, and L. Albajar, Estimation of parameters
defining negative tension stiffening. Engineering Structures, 2010.
32(10): p. 3355-3362.
[6] Whaley, C. and A. Neville, Non-elastic deformation of concrete under
cyclic compression. Magazine of Concrete Research, 1973. 25(84): p.
145-154.
[7] Gribniak, V., et al.., Long-term deflections of reinforced concrete
elements: accuracy analysis of predictions by different methods.
Mechanics of Time-Dependent Materials, 2013. 17(3): p. 297-313.
[8] Eurocode 2, Design of Concrete Structures. 1992: ENV 1992-1-1.
[9] Domone, P.L. and J.M. Illston, eds. Construction Materials: Their
Nature and Behaviour. Fourth edition ed. 2010, Spon Press: London.
[10] Acker, P. and F.-J. Ulm, Creep and shrinkage of concrete: physical
origins and practical measurements. Nuclear Engineering and Design,
2001. 203(2–3): p. 143-158.
[11] Nawy, E.G., Concrete construction engineering handbook. 2010: CRC
press.
[12] Deflection of Cracked RC Beams under Sustained Loading. Journal of
Structural Engineering, 2000. 126(6): p. 708-716.
[13] Du béton, F., CEB-FIP Model Code 1990: Design Code. 1993: T.
Telford.
@article{"International Journal of Architectural, Civil and Construction Sciences:70943", author = "Sultan Daud and John P. Forth and Nikolaos Nikitas", title = "Time-Dependent Behavior of Reinforced Concrete Beams under Sustained and Repeated Loading", abstract = "The current study aims to highlight the loading
characteristics impact on the time evolution (focusing particularly on
long term effects) of the deformation of realized reinforced concrete
beams. Namely the tension stiffening code provisions (i.e. within
Eurocode 2) are reviewed with a clear intention to reassess their
operational value and predicting capacity. In what follows the
experimental programme adopted along with some preliminary
findings and numerical modeling attempts are presented. For a range of long slender reinforced concrete simply supported
beams (4200 mm) constant static sustained and repeated cyclic
loadings were applied mapping the time evolution of deformation.
All experiments were carried out at the Heavy Structures Lab of the
University of Leeds. During tests the mid-span deflection, creep
coefficient and shrinkage strains were monitored for duration of 90
days. The obtained results are set against the values predicted by
Eurocode 2 and the tools within an FE commercial package (i.e.
Midas FEA) to yield that existing knowledge and practise is at times
over-conservative.", keywords = "Eurocode2, midas fea, repeated, sustained loading.", volume = "9", number = "10", pages = "1298-4", }