Seismic Input in the Structural Design: Considerations and Application to the Italian Territory

Seismic Input in the Structural Design: Considerations and Application to the Italian Territory

P. Clemente G. Bongiovanni G. Buffarini F. Saitta 

ENEA, Rome, Italy

30 June 2015
| Citation



Some recent seismic events pointed out the necessity to revise our way of seismic analysis of structures. But what do structural engineers need to design anti-seismic structures? The first step is the analysis of the seismic input, defined by means of the basic hazard analysis and of the local seismic response. Once the description of the seismic hazard is known, the choice of the protection degree should be made on the basis of economical evaluations. Furthermore, the uncertainties about the local seismic response could be very important. The second step is the structural modeling and analysis, whose suit-ability depends on how good is the description of the material behavior, geometrical characteristics of the structure, and its behavior both in elastic and inelastic ranges. This is accounted for by means of the behavior factor, whose definition and use are quite delicate and often not necessary, especially in low-to medium-seismicity areas, as demonstrated by means of a comprehensive numerical analysis on the construction costs of reinforced concrete buildings. In this article, some important issues are discussed and some proposals are given to improve the technical codes and hence the safety of structures against earthquakes. The seismic input to be used in the retrofit of existing buildings is also discussed.


Anti-seismic design, seismic hazard, structural safety


[1] Bazzurro, P., Alexander, D., Clemente, P., Comerio, M., De Sortis, A., Filippou, F., Goretti, A., Jorjani, M., Mollaioli, F., Mosalam, K., Price, H.J., Court, C.P., Schotanus, M. & Stewart, J., Learning from Earthquakes. The Mw 6.3 Abruzzo, Italy, Earthquake of April 6, 2009, EERI Special Earthquake. Report, 2009.

[2] Çelebi, M., Bazzurro, P., Chiaraluce, L., Clemente, P., Decanini, L., De Sortis, A., Ellsworth, W., Gorini, A., Kalkan, E., Marcucci, S., Milana, G., Mollaioli, F., Olivieri, M., Paolucci, R., Rinaldis, D., Rovelli, A., Sabetta, F. & Stephens, C., Recorded motions of the Mw6.3 April 6, 2009 L’Aquila (Italy) earthquake and implications for building structural damage: a review. Earthquake Spectra, EERI, 26(3), pp. 651–684, 2010. doi:

[3] Pozzati, P., Proliferation of regulations and technicality. AICAP News in Industria italiana del cemento, 3, pp. 3–5, 1993.

[4] Iervolino, I., Probabilità e salti mortali: le insidie della validazione dell’analisi di pericolosità attraverso l’occorrenza di singoli terremoti. Progettazionesismica, 2,

pp. 37–43, IUSS Press, 2012.

[5] Abrahamson, N.A., Seismic hazard assessment: problems with current practice and future developments. Proc. of First European Conf. on Earth. Eng. and Seismology, Geneva, Switzerland, 2006.

[6] Panza, G., Romanelli, F. & Vaccari, F., Seismic wave propagation in laterally heterogeneous anelastic media: theory and applications to seismic zonation. Advances in Geophysics, 43, pp. 1–95, 2001. doi:

[7] Zuccolo, E., Vaccari, F., Peresan, A. & Panza, G., Neo-deterministic and probabilistic seismic hazard assessment: a comparison over the Italian territory. Pure Appl. Geophys., 168, pp. 69–83, 2011. doi:

[8] Rinaldis, D. & Clemente, P., Seismic input characterization for some sites in Italy. Earthquake Resistant Engineering Structures IX, eds. C.A. Brebbia & S. Hernández, WIT Transactions on Eng. Sciences, Vol. 79, pp. 13–21, 2013. doi:

[9] Saitta, F., Bongiovanni, G., Buffarini, G., Clemente, P, Martelli, A., Marzo, A., Marghella, G., Indirli, M. & Poggianti, A., Behaviour of industrial buildings in the Pianura Padana Emiliana earthquake. In Focus on The Pianura Padana Emiliane Earthquake – Energia, Ambiente e Innovazione, No. 4–5, parte II, pp. 47–57, ENEA: Roma, 2012.

[10] Clemente, P., Rinaldis, D., Bongiovanni, G. & Saitta, F., What information is needed to design anti-seismic structures? Earthquake Resistant Engineering Structures IX, eds. C.A. Brebbia & S. Hernández, WIT Transactions on Eng. Sciences, Vol. 79, pp. 3–11, 2013. doi:

[11] Clemente, P. & Buffarini, G., Base isolation: design and optimization criteria. Seismic Isolation and Protective Systems. Mathematical Science Publisher, 1(1), pp. 17–40, 2010. doi:

[12] Bongiovanni, G., Buffarini, G., Clemente, P. & Saitta, F., Building in seismic areas: towards a new prevention policy. 15th World Conf. on Earth. Eng., 15WCEE (September 24–28, Lisbon), Paper No. 0672, 2012.

[13] Clemente, P. & De Stefano, A., Application of seismic isolation in the retrofit of historical buildings. Earthquake Resistant Engineering Structures, eds. C.A. Brebbia &

M. Maugeri, WIT Transactions on the Built Environment, Vol. 120, pp. 41–52, 2011. doi:

[14] Clemente, P., De Stefano, A. & Renna, S., Isolation system for existing buildings. Proc. of the 12th World Conf. On Seismic Isolation, Energy Dissipation and Active Control of Structures – 12WCSI (September 20–23, Sochi, Russia), ASSISi, 2011.