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113 results on '"Realfonzo, R."'

1. Modelling of RC Beam-Column Exterior Joints for Cyclic Loadings

Author

Grande, E., Imbimbo, M., Napoli, A., Nitiffi, R., Realfonzo, R., di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, and Menegotto, Marco, editor

Published
2024
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12. Cyclic behavior of RC columns strengthened by FRP and steel devices

Author

Realfonzo, R. and Napoli, A.

Subjects
Earthquake resistant design -- Evaluation, Fibrous composites -- Mechanical properties, Reinforced concrete -- Mechanical properties, Engineering and manufacturing industries, Science and technology
Abstract

This paper presents several results of a wide experimental program undertaken to evaluate the seismic performance of RC columns, externally confined with fiber-reinforced polymers (FRPs). Specimens consisted of full scale square columns, 300 mm on each side, reinforced by using both smooth and deformed steel rebars and subjected to a constant axial load and monotonic or cyclic flexure; in particular, two levels of the axial load were considered. Tests were conducted, in displacement control, on both FRP confined and unconfined RC columns: the confinement system was obtained by partially wrapping two or four unidirectional carbon (CFRP) or glass (GFRP) fiber layers around the member; additionally, some tests were performed on members strengthened by using both the external CFRP wrapping and longitudinal steel angles. Experimental results allowed evaluating depending on the level of applied axial load and on the type of steel rebars adopted for reinforcing each column--the benefits introduced by the considered strengthening systems in terms of strength, ductility, and energy dissipation capacity. DOI: 10.1061/(ASCE)ST.1943-541X.0000048 CE Database subject headings: Rehabilitation; Fiber reinforced polymers; Ductility; Experimentation; Reinforced concrete; Concrete columns.

Published
2009

21. Confinement of RC elements by means of EBR FRP systems

Author

Pantazopoulou, Stavroula J., Balafas, I., Bournas, D., Guadagnini, M., D’Antino, T., Lignola, G. P., Napoli, A., Pellegrino, C., Prota, A., Realfonzo, R., and Tastani, S.

Abstract

19 131 194

Published
2016

24. Bagehot,Walter

Author

Pacella, Andrea and Realfonzo, R.

Published
2015

28. Probabilistic seismic response analysis of existing masonry structures

Author

Vailati, M, Monti, G, Khazna, M.J, Realfonzo, R, De Iuliis, Massimiliano, Vailati, M, Monti, G, Khazna, M.J, Realfonzo, R, and De Iuliis, Massimiliano

Abstract

Masonry buildings represent a large and important portion of the existing building stock in several countries. They are still being built and nowadays they are mainly used as residential buildings, offices or for other activities. Most of these buildings are not designed to withstand earthquake-induced forces, therefore seismic safety assessment represents a crucial task to estimate risk level and eventually define retrofit measures. This task is hampered by the many uncertainties affecting the acquired data on plan and elevation geometry, material properties, connections between walls and roof, connections between walls and walls, seismic actions. The present paper intends to give a contribution in dealing with such uncertainties by applying a global probabilistic analysis on different masonry structural units. Such approach is based on the Italian seismic code and relies on a simplified non-linear assessment method. Purposely developed codes have been used for deriving the equivalent bilinear constitutive laws of floors and of the entire structural unit. Afterwards, a fully probabilistic Monte Carlo-based analysis has been performed by including and consistently modeling all uncertainties affecting the structural response. Capacity-demand ratios and failure probabilities have been evaluated for every considered structural unit. The subsequent sensitivity analyses have allowed for identification and quantification of the effect of all considered variables on the global response. Some interesting remarks on results obtained have been developed in order to progress towards a reliable and simple assessment procedure.

Published
2016

29. EXPERIMENTAL AND ANALYTICAL EVALUATION OF BOND PROPERTIES OF GFRP BARS

Author

Peece, M., Manfredi, G., Realfonzo, R., and Cosenza, E.

Subjects
Metal bonding -- Analysis, Reinforced concrete -- Analysis, Reinforced plastics -- Analysis, Engineering and manufacturing industries, Science and technology
Abstract

A better understanding of the bond behavior, which is one of the main behavioral aspects of reinforced concrete structures, is needed for fiber-reinforced plastic reinforcing bars, because tests have shown that the bond is different from that of steel reinforcing bars and varies with the type of reinforcing bar as well. In this paper results from bond tests performed on commercially available glass fiber-reinforced plastic (GFRP) reinforcing bars are presented and discussed. The experimental bond-slip curves have been obtained and some information about bond mechanisms have been derived. Furthermore, values of the elastic modulus and the tensile strength of the reinforcing bars have been measured. Finally, a numerical procedure for the identification of the constitutive bond stress-slip relationship, based on the experimental results, is presented.

Published
2001

34. Comportamento strutturale in fase pre-eruttiva: il caso Vesuvio

Author

COSENZA, EDOARDO, FESTA, GAETANO, Manfredi G., Polese M., Realfonzo R., VERDERAME, GERARDO MARIO, ZOLLO, ALDO, A.A.V.V., Cosenza, Edoardo, Festa, Gaetano, Manfredi, G., Polese, M., Realfonzo, R., Verderame, GERARDO MARIO, and Zollo, Aldo

Published
2003

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