NORMATIVA DE LOS GIMNASIOS

RESEARCH GROUP: Andrea Benedetti, Claudio Mazzotti, Marco Savoia

KEYWORDS: precast structure, experimental study, node panel, creep, bar anchorage

In the last few years, precast construction systems for multi-storey buildings which include in-situ completion are becoming more and more com- mon. They provide a certain degree of hyperstat- icity and an adequate resistance to seismic actions to the structure. The research group is interested in the characterization of precast reinforced con- crete structural elements such as beams, single- or multi-storey columns, columns anchored to the foundation, beam-column joints and sandwich panels, with regard to the serviceability and ulti- mate limit states.

The research was carried out conducting lab tests on full-scale specimens and numerical models for the interpretation of the experimental results. The long-term behaviour and the evolution of the strain distribution in the various construction stages of precast reinforced concrete beams constructed by stages have been observed and a fibre model have been proposed to describe the long-term redistribu- tion of stresses in the section. Tests on multi-storey precast columns with only longitudinal reinforce- ment in the node panel were conducted and a nu- merical model to predict the critical load was vali- dated. Tests on the behavior of bars anchored in the foundation inside metal box, filled with high-per- formance mortar have been carried out considering monotonic and cyclic loads (pull-out tests on in- dividual bars with different anchorage lengths and tests on RC columns, anchored in foundation, un- der cyclic bending and axial force) as well as tests for the evaluation of the cyclic behaviour of full-scale three and four way beam-column nodes.

Currently the research group is also working on innovative wall systems made of concrete and weak reinforcement and on walls made of wood- en blocks. Monotonic and cyclic tests have been conducted on full scale specimens in order to char- acterize the seismic behaviour also, as well as tests for the evaluation of the performance of thermal and acoustic insulation. The group is also working in collaboration with companies for the develop- ment of a dissipative beam-column connection for precast reinforced concrete structures designed without seismic criteria.

MAIN PUBLICATIONS

Pollini A. V., Mazzotti C., Savoia M. (2013) Com- portamento sperimentale e numerico di un sistema dissipativo per le connessioni di strutture prefabbri- cate. 15° Convegno ANIDIS,30/06-04/07/2013, Padova.

Savoia M., Mazzotti C., Buratti N., Ferracuti B., Bovo M., Ligabue V., Vincenzi L. (2012) Damages and col- lapses in industrial precast buildings after the Emilia earthquake. Ingegneria Sismica 3-3, 120-131. Mazzotti C., Bacci L. (2012) Prove di pull-out su un sistema di ancoraggio per strutture prefabbricate. 19° Congresso C.T.E. 8-10/11/2012, Bologna.

Bovo M., Mazzotti C. (2012) Indagini numeriche su nodi trave-colonna a tre vie per sistemi prefab- bricati completati in opera. 19° Congresso C.T.E. 8-10/11/2012, Bologna.

Vincenzi L., Mazzotti C., Ferrari M. (2011) Studio sperimentale-numerico di nodi trave-pilastro di sis- temi a telaio prefabbricati. 24° Convegno ANIDIS, 18-22/09/2011, Bari.

Mazzotti C., Vincenzi L. (2010) Experimental Investigation on a Beam-Column Node of a Mul- ti-Story Precast RC System. 14th _{European Con-}

ference on Earthquake Engineering, 30/08/2010 - 3/09/2010, Ohrid, Republic of Macedonia. Mazzotti C., Savoia M., Ferrari M. (2010), Com- portamento ciclico degli ancoraggi in fondazione di pilastri prefabbricati. 18° Congresso C.T.E. Brescia. 11-13/11/2010 pp. 1-10.

Mazzotti C., Vincenzi L., Savoia M., Ferrari M. (2010), Comportamento di nodi trave-colonna di strutture parzialmente prefabbricate. 18° Congresso C.T.E. Brescia. 11-13/11/2010 pp. 1-10.

Bottoni M., Mazzotti C. e Savoia M. (2009), Long- term experimental tests on precast beams completed with cast in situ concrete, European Journal of En- vironmental and Civil Engineering, 13(6), pp. 727- 744.

Mazzotti C., Savoia M. (2008). A fiber model for the long-term behavior of reinforced concrete sec- tions. Proceedings of the 8th international confer- ence on Creep, Shrinkage and Durability Mechan- ics of Concrete and Concrete Structures. Ise-Shima, Japan. 30 September - 2 October, pp. 615-621.

Bottoni M., Mazzotti C., Savoia M. (2008). Prove sperimentali a lungo termine su una trave prefab- bricata realizzata in due fasi. 17° Congresso C.T.E. Roma. 5-8/11/2008 pp. 223-232.

Benedetti A., Finotto E., Montesi M. (2007). Mod- ellazione ad Elementi Finiti di Edifici a Struttura Prefabbricata in Zona Sismica, Atti del XII Con- vegno Nazionale L’Ingegneria Sismica in Italia, 10- 14/06/2007. Pisa, Italy.

Vincenzi L., Mazzotti C., Savoia M., Ceccoli C., Ferrari M. (2007). Investigation of ultimate capac- ity of beam-column joints of precast system. Studies and Researches Vol. 27, pp. 93-116.

Ceccoli C., Mazzotti C., Savoia M., Vincenzi L. e Ferrari M. (2007). Comportamento dei nodi del sistema di prefabbricazione APE, Industria della prefabbricazione, Vol. 13/2007, pp. 14-26.

Ceccoli C., Mazzotti C., Savoia M., Vincenzi L., Ferrari M. (2006). Comportamento dei nodi del sistema di prefabbricazione Ape, 16° Congresso C.T.E., 9-11/11/2006, Parma.

RESEARCH PROJECTS

Research Project with APE (Montecchio Emilia - RE) for the study of the mechanical behaviour of precast elements completed on site. Coordinator: Prof. Marco Savoia.

Research Project with REGLASS (Minerbio - Bo) for the development of dissipative beam-column con- nections in precast reinforced concrete structures. Research Project with TERZER (Besenello - TN) for the characterization of the mechanical behavior and thermo-acoustic properties of walls made of wooden blocks.

Research Project with ISOBLOC (Soragna - Pr) for the study of innovative block-formwork systems. 2010-2013: Research project funded by the De- partment of Civil Protection – Reluis, Task 2.1.1: Aspects on the seismic design of new buildings - “Reinforced Concrete Structures” Coordinator: Prof. Spacone

CONTACTS

[email protected] [email protected] [email protected]

Fig. 1. Long-term tests on cracked FRC beams.

Fig. 2. Force-crack opening curves from three- point bending tests.

Fig. 3. Development with time of viscosity for different SCCs.

NUMERICAL AND EXPERIMENTAL CHARACTERIZATION OF THE INSTAN-