Materiales de Construcción, Vol 60, No 298 (2010)

Bending reinforcement of timber beams with steel cross sections on the upper face


https://doi.org/10.3989/mc.2010.47408

Carlos González-Bravo
Universidad Antonio de Nebrija, Madrid., Spain

Francisco Arriaga-Martitegui
Universidad Politécnica de Madrid, Spain

Luis Maldonado-Ramos
Universidad Politécnica de Madrid, Spain

Rafael Díez-Barra
Centro de Investigación Forestal-INIA, Madrid, Spain

Abstract


A procedure for the reinforcement of timber floor joists in ancient buildings using steel U shape cross sections screwed to timber from the upper side is described. Bending tests of 3 groups of 10 beams were carried out obtaining the stiffness and load carrying capacity. The first one was composed by pieces of glued laminated timber of Spruce with 180x200 mm cross section; the second one was of Scots pine sawn timber with the same cross section; and the third one was 120 years old solid timber beams of genus Pine with 130x150 mm cross section. Each group was divided in two groups of 5 beams. The first sub-group was tested without reinforcement and the second one was tested with the steel reinforcement. The reinforcement increases the stiffness from 45 to 98 % and the load carrying capacity from 27 to 58 %.

Keywords


timber; steel; finite elements method; upgrading; rehabilitation

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References


(1) Arriaga, F., Peraza, F., Esteban, M., Bobadilla, I. y García, F. (2002). Intervención en estructuras de madera. Editorial AITIM, Madrid, 476 pp.

(2) Anon. (1982). The age of resin. The Architects Journal, Feb. pp. 56-58.

(3) Landa, M. (1999). Nuevas técnicas de reparación de estructuras de madera. Elementos flexionados. Aporte de madera-Unión encolada I. Metodología de puesta en obra. Revista de Edificación nº 28, Pamplona, pp. 32-38.

(4) Landa, M. (1999). Nuevas técnicas de reparación de estructuras de madera. Elementos flexionados. Aporte de madera-Unión encolada II. Metodología de puesta en obra. Revista de Edificación nº 29, Pamplona, pp. 30-36.

(5) Mettem, C.J., Page, A.V. y Robinson, G.C. (1993). Repair of structural timbers. Part I: Test on experimental beam repairs. TRADA, Reino Unido.

(6) Navarrete, I. (1996). Palacio de la Aljafería de Zaragoza. Refuerzo de la viguería. AITIM nº 183. pp. 61-63.

(7) Cigni, G., Amato, R.O., Chigi, P., Perrone, U., Rocchi, P. (1981). Nuove tecniche di consolidamento di trave in legno. Edizione Kappa. Roma. 53 pp.

(8) Tanaka, H., Idota, H., Ono, T. (2006). Evaluation of buckling strength of hibrid timber columns reinforced with steel plates and carbon fiber sheets. Proceedings of 9th World Conference on Timber Engineering WCTE 2006. Portland, Oregon, USA.

(9) Smedley, D., Alam, P., Ansell, M.P. (2006). George Street, St. Albans, UK – a case study in the repair of historic timber structures using bonded-in pultruded plates. Proceedings of 9th World Conference on Timber Engineering WCTE 2006. Portland, Oregon, USA.

(10) Martin, L., Properzi, M., Pichelin, F., Triboulot, P. (2006). Pre-stressed FRP for the in-situ strengthening of timber structures. Proceedings of 9th World Conference on Timber Engineering WCTE 2006. Portland, Oregon, USA.

(11) Alam, P., Ansell, M.P., Smedley, D. (2006). Repair of fractured spruce beams with bonded-in reinforcements. Proceedings of 9th World Conference on Timber Engineering WCTE 2006. Portland, Oregon, USA.

(12) Akbiyik, A., Lamanna, A. J. and Micah Hale, W. (2007). Feasibility investigation of the shear repair of timber stringers with horizontal splits. Construction and building materials 21 (2007) 991-1000. doi:10.1016/j.conbuildmat.2006.03.004

(13) Ceccotti, A. (1995). Timber-concrete composite structures. Timber Engineering. STEP 2, E13. Centrum Hout, Holanda.

(14) Bottinelli, G. (2000). Habitat System Beton: ragioni, certificazione, risultati sperimentali. Adrastea, nº 16.

(15) Tampone, G. (1989). Restauro strutturale con lamine metalliche dei solai lignei della sede del Genio Civile di Firenze. Il restauro del legno, Volume primo. Nardini Editore, Florencia, pp. 263-281.

(16) UNE-EN 1995-1-1. Proyecto de Estructuras de Madera. Parte 1-1: General – Reglas comunes y reglas para la edificación.

(17) Cecchi, A. (1989). Rinforzo di solai in legno mediante soletta collaborante in calcestruzzo armato con collegamenti di tipo elastico. Il restauro del legno, Volume secondo. Nardini Editore, Florencia, pp. 201-213.

(18) Kreuzinger, H. (1995). Mechanically jointed beams and columns. Timber Engineering. STEP 1, B11. Centrum Hout Holanda.

(19) Fernández-Cabo, J.L. Fernández-Lavandera, J. and Ávila-Jalvo, J.M. (2006).Wood-concrete and wood-wood mixed beams: a rational basis for selecting the connections. Proceeding of 9th World Conference on Timber Engineering. Portland, Oregon, USA.

(20) Gramegna, F. y Marampon, F. (1996). Dal rilievo del degrado per incendio alle suelte di consolidamento. Adrastea 7/96, pp. 40-47.

(21) González-Bravo, C. (2007). Recuperación de la capacidad mecánica en piezas de madera solicitadas a flexión en estructuras tradicionales operando por la cara superior mediante refuerzos y prótesis metálicas. Tesis Doctoral, Universidad Politécnica de Madrid.

(22) UNE-EN 10025-1 Productos laminados en caliente de aceros para estructuras. Parte 1: Condiciones técnicas generales de suministro. (Hot rolled products of structural steels - Part 1: General technical delivery conditions).

(23) DIN 571 Tirafondos para madera con cabeza hexagonal screws (Hexagon head wood).

(24) UNE-EN 408. Estructuras de madera. Madera aserrada y madera laminada encolada para uso estructural. Determinación de algunas propiedades físicas y mecánicas. (Timber structures. Sawn timber and glued laminated timber for structural use. Determination of some physical and mechanical properties). 2004.

(25) EN 13183-2. 2002. Contenido de humedad de una pieza de madera aserrada. Parte 2: Estimación mediante el método de la resistencia eléctrica. (Moisture content of a piece of sawn timber. Part 2: Estimation by electrical resistance method).




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