PSI - Issue 62

Stefano Stacul et al. / Procedia Structural Integrity 62 (2024) 617–624 Stefano Stacul and Nunziante Squeglia / Structural Integrity Procedia 00 (2019) 000 – 000

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4. Conclusions The results presented in this contribution provide further support to the relevance of Soil-Structure Interaction in the case of pile supported bridge piers. The use of simplified formulae in literature (for specific soil conditions) or advanced numerical tools (for more complex situations) for the assessment of the Foundation Input Motion represent a great opportunity to take advantage of the possible beneficial effect of SSI especially in the case of soft soil deposits, large diameter piles and low rotational component of the FIM. Moreover, appropriate seismic response analyses proved, at least for the pile-soil systems studied herein, to be very important, especially in the case of soft soils. In fact, adopting SRA results as input significantly improved the performance of simplified models (fixed-base and compliant-base SDOF models) in the assessment of the superstructure response under seismic conditions. Anoyatis, G., Di Laora, R., Mandolini, A., Mylonakis, G., 2013. Kinematic response of single piles for different boundary conditions: analytical solutions and normalization schemes. Soil Dynamics and Earthquake Engineering, 44, 183-195. Blaney, G.W., Kausel, E., Roesset, J.M., 1976. Dynamic stiffness of piles. Proceedings 2nd International Conference on Numerical Methods in Geomechanics. Balcksburg, Virginia. Di Laora, R., Grossi, Y., De Sanctis, L., Viggiani, G.M., 2017. An analytical solution for the rotational component of the Foundation Input Motion induced by a pile group. Soil Dynamics and Earthquake Engineering, 97, 424-438. Di Laora, R., Rovithis, E., 2015. Kinematic bending of fixed-head piles in nonhomogeneous soil. Journal of Geotechnical and Geoenvironmental Engineering, 141(4), 04014126. Fan, K., Gazetas, G, Kaynia, A., Kausel, E., Ahmad, S., 1991. Kinematic seismic response of single piles and pile groups. Journal of Geotechnical Engineering, 117(12), 1860-1879. Gazetas, G., 1996. Soil dynamics and earthquake engineering — case studies. Athens (in Greek):Simeon Publications; 1996. Iovino, M., Di Laora, R., Rovithis, E., de Sanctis, L., 2019. The beneficial role of piles on the seismic loading of structures. Earthquake Spectra, 35(3), 1141-1162. Kausel, E., Roesset, J. M., 1974. Soil structure interaction problems for nuclear containment structures (No. CONF-740829-). American Society of Civil Engineers, New York. Kausel, E., Whitman, R. V., Morray, J. P., Elsabee, F., 1978. The spring method for embedded foundations. Nuclear Engineering and design, 48(2 3), 377-392. Kaynia, A.M., Kausel, E., 1991. Dynamics of piles and pile groups in layered soil media. Soil Dynamics and Earthquake Engineering, 10(8), 386 401. Nikolaou, S., Mylonakis, G., Gazetas, G., Tazoh, T., 2001. Kinematic pile bending during earthquakes: analysis and field measurements. Geotechnique, 51(5), 425-440. Norme Tecniche per le Costruzioni, NTC, 2018. Gazzetta Ufficiale, n. 42 del 20/02/2018, Supplemento ordinario n.8 [in Italian]. Seed, H. B., Idriss, I. M., 1970. Soil Moduli and Damping Factors for Dynamic Response Analyses. Report EERC 70-10, Earthquake Engineering Research Center, University of California, Berkeley. Stacul, S., Rovithis, E., Di Laora, R., 2022. Kinematic Soil–Pile Interaction under Earthquake-Induced Nonlinear Soil and Pile Behavior: An Equivalent-Linear Approach. Journal of Geotechnical and Geoenvironmental Engineering, 148(7), 04022055. Stacul, S., Squeglia, N., 2018. KIN SP: a Boundary Element Method based code for single pile kinematic bending in layered soil, Journal of Rock Mechanics and Geotechnical Engineering, 10(1), pp 176-187 Stacul, S., Squeglia, N., 2020. Simplified assessment of pile-head kinematic demand in layered soil. Soil Dynamics and Earthquake Engineering, 130. Stacul, S., Squeglia, N., 2023. Semi-analytical solutions for evaluating the FIM for pile foundations. In 9 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2023, M. Papadrakakis M. Fragiadakis (eds.), Athens, Greece, 12-14 June 2023. Vucetic, M., Dobry, R., 1991. Effect of soil plasticity on cyclic response. Journal of Geotechnical Engineering, 17: 89-107. References