vai al contenuto della pagina vai al menu di navigazione
 

Experimental research upon large lightly-reinforced concrete walls

Keywords: large lightly-reinforced concrete walls; wood-concrete caisson blocks; pseudo-static tests
Fig.1 Examples of solutions for reinforcedconcrete walls (left: Isotex, right: Trombetti).
Fig.2 Results of experimental tests with cyclic horizontal loading (Silvestri).
Experimental research upon large lightly-reinforced concrete walls - Fig. 3
Fig.3 Shaking-table tests upon a full-scale 3-storey building (Silvestri).

Buildings made up of reinforced-concrete walls represent a structural typology which has been widely used in economic public housing. Such building structures characterised by small wallthickness (15 - 25 cm) and by small percentage values of steel reinforcement have shown excellent strength resources even against strong earthquake ground motions: the structural overstrength allows to reduce the ductility demand. However, still few experimental and analytical studies have been performed up to now with the aim of evaluating the ultimate (near-collapse) seismic performances of buildings realised using large lightly-reinforced concrete walls.

The research group has recently organised, designed and interpreted (by means of appropriately- developed analytical models capable of capturing the experimental behaviour) a series of experimental tests with cyclic horizontal loading and shaking table tests (conducted at the laboratory of the European Seismic Centre EUCENTRE in Pavia) upon a peculiar typology (with non-returnable block-formwork) of lightly reinforced concrete walls. Due to the peculiar conformation of the block-formwork, the structural wall so-obtained is characterised by the presence of lightening alveolar zones. Inside the blocks, before casting the concrete, appropriate horizontal and vertical reinforcement steel bars are placed, so that the structural walls is actually a reinforced-concrete wall. To obtain an adequate characterisation of the seismic behaviour (stiffness, strength, ductility) of such walls, experimental pseudo-static tests with constant vertical loading and increasing horizontal loading have been carried out both upon single walls and upon a H-shaped 2-storey structural system. The results obtained show a good ductile behaviour, yielding horizontal loads comparable with applied vertical loads, and the maintenance of strength to vertical loads after damaging.

Total number of publications: 20

Main publications

Palermo, M., Ricci, I., Silvestri, S., Gasparini, G., Trombetti, T., Foti, D., and Ivorra, S. (2014). Preliminary interpretation of shaking-table response of a full-scale 3-storey building composed of thin reinforced concrete sandwich walls, Engineering Structures, 76, 75-89.

Ricci I., Palermo M., Gasparini G., Silvestri S., and Trombetti T. (2013) “Results of pseudo-static tests with cyclic horizontal load on cast in situ sandwich squat concrete walls”, Engineering Structures 54: 131–149, DOI 10.1016/j.engstruct.2013.03.046.

T. Trombetti, S. Silvestri, G. Gasparini, I. Ricci, S. Ivorra, D. Foti (2013). Preliminary results of a shaking table tests on a 3-story building realized with cast in place sandwich squat concrete walls, ISEC-7, Honolulu, June 18 –23, 2013.

S. Ivorra, B. Ferrer, D. Foti, L. Stempniewski, T. Trombetti, S. Silvestri, G. Gasparini, I. Ricci, A. Catalini, C.M. Campian, D. Malavolta, Final Report - SE. SI. CO. WA. Project, December 2012.

T. Trombetti, S. Silvestri, G. Gasparini, I. Ricci, S. Ivorra, D. Foti (2012). Shaking table tests on a 3-storey building specimen composed of cast-insitu concrete walls, 15th World Conference on Earthquake Engineering, Lisbon, Portugal, 24-28 September 2012.

T. Trombetti, S. Silvestri, G. Gasparini, I. Ricci, S. Ivorra, D. Foti (2011). Progettazione di una prova su tavola vibrante di un edificio a tre piani in scala reale costituito da pareti sandwich in c.a. gettato in opera, XIV Convegno Nazionale “L’Ingegneria Sismica in Italia” ANIDIS 2011, Bari, 19 - 22 Settembre 2011.

Trombetti T., Silvestri S., Gasparini G., Ricci I., “Results of pseudo-static tests with cyclic horizontal load on concrete/polystyrene sandwich bearing panels”, Atti del Convegno “Le Nuove Frontiere del Calcestruzzo Strutturale”, Università degli Studi di Salerno – ACI Italy Chapter, 22-23 Aprile 2010.

Trombetti T., Silvestri S., Gasparini G., Ricci I., “Correlations between the experimental results of pseudo-static tests with cyclic horizontal load on concrete/polystyrene sandwich bearing panels and their analytical counterparts”, Atti “Le Nuove Frontiere del Calcestruzzo Strutturale”, Università di Salerno – ACI Italy Chapter, 22-23 Aprile 2010.

Ricci I., Gasparini G., Silvestri S., Trombetti T., “Correlations between the experimental results of pseudo-static tests with cyclic horizontal load on concrete/polystyrene sandwich bearing panels and their analytical and numerical counterparts”, Proc. “Sustainable Development Strategies for Constructions in Europe and China”, Roma, Italy, April 19-20, 2010.

Ricci I., Malavolta D., Gasparini G., Silvestri S., Trombetti T., Ceccoli C., “Risultati di prove sperimentali pseudo-statiche con carico orizzontale ciclico effettuate su pannelli “sandwich” in conglomerato cementizio debolmente armato” articolo ID401 (S5.7) negli Atti ANIDIS 2009, Bologna, 28 Giugno - 2 Luglio 2009.

Gasparini G., Trombetti T., Silvestri S., Ceccoli C., Malavolta D., “Results of “pseudo-static” tests with cyclic horizontal load on r.c. panels made with wood-concrete caisson blocks”, Paper 12-03-0054. Proceedings of the 14th World Conference on Earthquake Engineering (14WCEE), Beijing, China, 12-17 October 2008.

Research projects

Convenzione C&P Costruzioni – DISTART. Responsabile scientifico: Prof. Claudio Ceccoli.

Convenzione Nidyon Costruzioni – DISTART. Responsabile scientifico: Prof. Claudio Ceccoli.

Progetto di ricerca SERIES (2010-2011): “Seismic behavior of structural systems composed of cast in situ concrete walls”, EUCENTRE TREES Lab facility (Pavia, Italy), Lead User: Prof. Salvador Ivorra Chorro, University of Alicante, Responsabile Unità di Bologna: Prof. Tomaso Trombetti.