Evaluating the Structural Capacity of Concrete Elements through In Situ Instrumentation

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The difficulty in predicting the long term load capacity of concrete elements is well documented. Time dependent effects such as creep and shrinkage coupled with varying loading events, particularly during construction, can all have an adverse effect on the long term performance of a concrete structure. This paper proposes a method that utilises in-situ instrumentation to predict the load carrying capacity of concrete members. During the construction of the Engineering building at the National University of Ireland, Galway over 260 sensors were embedded in a number of key concrete elements. The sensors are being continually monitored with the use of automatic datalogging equipment and the data is being used to monitor changes in geometric and material properties along with the subsequent time dependent deterioration of the elements. The paper will illustrate how the in-situ data from the demonstrator building can be used to estimate the real time behaviour of the concrete elements and how these elements might respond to future changes in use and potential retrofitting. A cost analysis will show how such a monitoring system can be used to reduce the uncertainty levels involved when retrofitting concrete buildings.

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Periodical:

Key Engineering Materials (Volumes 569-570)

Edited by:

Biswajit Basu

Pages:

382-389

Citation:

D. Byrne and J. Goggins, "Evaluating the Structural Capacity of Concrete Elements through In Situ Instrumentation", Key Engineering Materials, Vols. 569-570, pp. 382-389, 2013

Online since:

July 2013

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$38.00

[1] Z.P. Bazant, Probabilistic problems in prediction of creep and shrinkage effects in structures, Proceedings of the 4th International Conference on Application of Statistics and Probability in Soil and Structural Engineering, Florence, Italy, 1983, pp.325-356.

[2] Z.P. Bazant and L. Panula, Practical prediction of time dependent deformation of concrete, Materials and Structures, vol. 11 (1978) pp.307-328.

[3] A.M. Neville, W.H. Dilger, and J.J. Brooks, Creep of plain and structural concrete. New York: Construction Press, (1983).

[4] T.R. Hossain and R.L. Vollum, Prediction of slab deflections and validation against Cardington data, Proceedings of the Institution of Civil Engineers; Structures and Buildings, vol. 152 (2002) pp.235-248.

DOI: https://doi.org/10.1680/stbu.152.3.235.38980

[5] R.L. Vollum and N. Afshar, Influence of construction loading on deflections in reinforced concrete slabs, Magazine of Concrete Research, vol. 61 (2009) pp.3-14.

DOI: https://doi.org/10.1680/macr.2009.61.1.3

[6] J. Goggins, D. Byrne and E. Cannon, The creation of a living laboratory, for structural engineering at the National University of Ireland, Galway, The Structural Engineer, vol. 90, (2012).

[7] D. Byrne, J. Goggins and E. Cannon, Assessing the performance of structural elements within the Engineering building at NUI Galway, presented at the BCRI Dublin, (2012).

[8] E. Cannon and J. Goggins, The New Engineering Building at NUI Galway as a Teaching Tool for Structural Engineering, presented at the BCRI 2010, Cork, Ireland, (2010).

[9] C. Bakis et al., Fiber-Reinforced Polymer Composites for Construction—State-of-the-Art Review, Journal of Composites for Construction, vol. 6 (2002) pp.73-87.

[10] American Concrete Institute, Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures, in ACI 440. 2R-02, ed. Farmington Hills, MI, (2002).

DOI: https://doi.org/10.1061/40753(171)159

[11] Federation International de Beton, FIB Bulletin No. 14; Externally bonded FRP reinforcement for RC structures, Lausanne, Switzerland, (2001).

[12] CEN, EN 1992-1-1, Eurocode 2: Design of concrete structures. General rules for buildings, ed. Brussels, Belgium, (1992).

[13] American Concrete Institute, Prediction of creep, shrinkage and temperature effects in concrete structures, in ACI 209R-92, ed. Detroit, (1992).

[14] N. Plevris and T. Triantafillou, Time Dependent Behavior of RC Members Strengthened with FRP Laminates, Journal of Structural Engineering, vol. 120 (1994) pp.1016-1042.

DOI: https://doi.org/10.1061/(asce)0733-9445(1994)120:3(1016)

[15] Z.P. Bazant et al., Wake-up call for creep, myth about size effect and black holes in safety: What to improve in fib model code draft, presented at the fib symposium Prague 2011, Prague, (2011).

[16] Fédération Internationale du Béton, Structural Concrete: Textbook on the behaviour, design and performance vol. 1, Lausanne, Switzerland, (1999).

[17] R.I. Gilbert, Time Effects in Concrete Structures. Amsterdam: Elsevier Science, (1988).

[18] D. Byrne, J. Goggins and E. Cannon, The analysis of time dependent effects of reinforced concrete systems through in-situ structural health monitoring, presented at the Global Thinking in Structural Engineering: Recent Achievements, Sharm El-Sheikh, Egypt, (2012).

[19] Z.P. Bazant, Prediction of concrete creep effects using age adjusted effective modulus method, Journal of the American Concrete Institute, vol. 69 (1972) pp.212-217.

DOI: https://doi.org/10.14359/11265

[20] A. Ghali, R. Favre and M. Elbadry, Concrete Structures - Stresses and Deformations, 3rd Edition ed. New York: Spon Press, (2002).

[21] C.J. Burgoyne, Does FRP have an economic future?, presented at the Advanced Composite Materials in Bridges and Structures, Calgary, Alberta, (2004).