Abstract
This study deals with the assessment of the shear strength characteristic value (V rck ) limited by the concrete strut crushing for existing reinforced concrete (RC) beams on the base of the available material data. A procedure to determine V rck is presented and applied to two existing RC beams extracted from an old structure built in the early 1900s. This procedure requires: (i) an analytical or numerical model for the beam shear strength, (ii) mean and standard deviation values for each uncertain basic variable and (iii) a proper formulation for the tolerance factor depending on amount of data, assumed fractile and given confidence level. The shear strength model adopted in this study is the one proposed by the Italian Code NTC 2008 for beams with transversal steel reinforcement. Several non-destructive tests (namely, rebound and sonic tests) and destructive tests on concrete were performed, and the experimental outcomes showed a great variability of the compressive strength along the same beam, as usual for many old concretes. For that reason, V rck values for each beam were calculated assuming different knowledge levels about the concrete compressive strength. Each level of knowledge is defined taking into account a different combination of available data about the compressive strength carried out from destructive tests. A comparison among the V rck values obtained for each knowledge level is shown to draw useful considerations about the beam shear strength assessment based on materials test data.
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References
NTC (2008) Nuove norme Tecniche per le costruzioni, Gazzetta Ufficiale della Repubblica Italiana, n. 29 del 4 febbraio 2008 – Suppl. Ordinario n. 30
Ang AHS, Tang WH (1975) Probability concepts in engineering planning and decision, basic principles. Wiley, New York
Albanesi T, Lavorato D, Nuti C, Santini S (2009) Experimental program for pseudodynamic tests on repaired and retrofitted bridge piers. Eur J Environ Civ Eng 13(6):671–683. https://doi.org/10.1080/19648189.2009.9693145
Albanesi T, Lavorato D, Nuti C, Santini S (2008) Experimental tests on repaired and retrofitted bridge piers. In: Proceedings of the International FIB Symposium 2008 - Tailor Made Concrete Structures: New Solutions for our Society, p 151
Fiorentino G, Forte A, Pagano E, Sabetta F, Baggio C, Lavorato D, Nuti C, Santini S (2017a) Damage patterns in the town of Amatrice after August 24th Central Italy earthquakes. Bull Earthq Eng 16:1399–1423. https://doi.org/10.1007/s10518-017-0254-z
Fiorentino G, Lavorato D, Quaranta G, Pagliaroli A, Carlucci G, Nuti C, Sabetta F, Monica GD, Piersanti M, Lanzo G, Marano GC, Monti G, Squeglia N, Bartelletti R (2017b) Numerical and experimental analysis of the leaning tower of Pisa under earthquake. Procedia Eng 199:3350–3355. https://doi.org/10.1016/j.proeng.2017.09.559
Giannini R, Sguerri L, Paolacci F, Alessandri S (2014) Assessment of concrete strength combining direct and NDT measures via Bayesian inference. Eng Struct 64:68–77
Imperatore S, Lavorato D, Nuti C, Santini S, Sguerri L (2012a) Shear performance of existing reinforced concrete T-beams strengthened with FRP. In: Proceedings of CICE 2012 6th International Conference on FRP Composites in Civil Engineering, Rome, Italy, 13–15 June 2012
Imperatore S, Lavorato D, Nuti C, Santini S, Sguerri L (2012b) Numerical modeling of existing RC beams strengthened in shear with FRP U-sheets. In: Proceedings of CICE 2012 6th International Conference on FRP Composites in Civil Engineering, Rome, Italy, 13–15 June 2012
Imperatore S, Lavorato D, Nuti C, Santini S, Sguerri L (2013) Shear behavior of existing RC T-beams strengthened with CFRP. In: International Association for Bridge and Structural Engineering, IABSE Symposium Report 2013, Assessment, Upgrading and Refurbishment of Infrastructures, vol 99(18), pp 958–965
Lavorato D, Bergami AV, Nuti C, Briseghella B, Xue J, Tarantino A, Marano G, Santini S (2017) Ultra-high-performance fibre-reinforced concrete jacket for the repair and the seismic retrofitting of Italian and Chinese RC bridges. In: COMPDYN 2017 6th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Rhodes Island, Greece, 15–17 June 2017
Lavorato D, Nuti C (2015) Pseudo-dynamic tests on reinforced concrete bridges repaired and retrofitted after seismic damage. Eng Struct 94:96–112. https://doi.org/10.1016/j.engstruct.2015.01.012
Lavorato D, Nuti C, Santini S, Briseghella B, Xue J (2015b) A repair and retrofitting intervention to improve plastic dissipation and shear strength of Chinese RC bridges. In: IABSE Conference, Geneva. Structural Engineering on Providing Solutions to Global Challenges - Report, pp 1762–1767
Lavorato D, Nuti C (2011) Pseudo-dynamic testing of repaired and retrofitted RC bridges. In: Proceedings of Fib Symposium PRAGUE 2011 on Concrete Engineering for Excellence and Efficiency, vol 1, pp 451–454
Lavorato D, Nuti C (2010a) Seismic response of repaired bridges by pseudodynamic tests. In: Bridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management, pp 2368–2375
Lavorato D, Nuti C, Santini S (2010b) Experimental investigation of the seismic response of repaired r.c. bridges by means of pseudodynamic tests. In: Large Structures and Infrastructures for Environmentally Constrained and Urbanised Areas, pp 448–449
Marano GC, Pelliciari M, Cuoghi T, Briseghella B, Lavorato D, Tarantino AM (2017) Degrading bouc-wen model parameters identification under cyclic load. Int J Geotechn Earthq Eng 8(2):60–81. https://doi.org/10.4018/IJGEE.2017070104
Monti G, Petrone F (2016) Test-based calibration of safety factor for capacity model. J Struct Eng 142:04016104
Quaranta G, Kunnath SK, Sukumar N (2012) Maximum-entropy meshfree method for nonlinear static analysis of planar reinforced concrete structures. Eng Struct 42:179–189
Scodeggio A, Quaranta G, Marano GC, Monti G, Fleischman RB (2016) Optimization of force-limiting seismic devices connecting structural subsystems. Comput Struct 162:16–27
Trentadue F, Quaranta G, Marano GC (2016) Closed-form approximations of the interaction diagrams for assessment and design of reinforced concrete columns and concrete-filled steel tubes with circular cross-section. Eng Struct 127:594–601
Trentadue F, Quaranta G, Greco R, Marano GC (2014) New analytical model for the hoop contribution to the shear capacity of circular reinforced concrete columns. Comput Concr 14(1):59–71
Zhou Z, Lavorato D, Nuti C, Marano GC (2015) A model for carbon and stainless-steel reinforcing bars including inelastic buckling for evaluation of capacity of existing structures. In: 5th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2015 pp. 876–886
Zhou Z, Nuti C., Lavorato D (2014) Modeling of the mechanical behavior of stainless reinforcing steel. In: Proceedings of the 10th fib International Ph.D. Symposium in Civil Engineering, pp. 515–520
Acknowledgements
This work was partially supported by the Italian Consortium of Laboratories ReLUIS, funded by the Italian Federal Emergency Agency, with partial funding from PE 2015–2018, joint program DPC-ReLUIS. This research is also supported by the Structural Laboratory College of Civil Engineering (Fuzhou University), the Sustainable and Innovative Bridge Engineering Research Center of Fuzhou University (SIBERC) and the International Joint-Lab (Universities of Roma Tre and Fuzhou).
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Lavorato, D. et al. (2018). Influence of Materials Knowledge Level on the Assessment of the Characteristic Value of the Shear Strength of Existing RC Beams. In: di Prisco, M., Menegotto, M. (eds) Proceedings of Italian Concrete Days 2016. ICD 2016. Lecture Notes in Civil Engineering , vol 10. Springer, Cham. https://doi.org/10.1007/978-3-319-78936-1_39
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