Abstract
The nonlinear response of shallow foundations when subjected to combined loading has attracted the attention of the research engineering community over the last few decades, providing promising evidence for incorporation of such response in design provisions. Failure in the form of soil yielding or foundation uplifting may accommodate high ductility demand and increase the safety margins of the whole structure. However, increased permanent displacement and rotation may occur. This paper explores the concept of shallow soil improvement as a means to locally increase soil strength and thus limit rocking-induced settlement. Bearing in mind that the rocking mechanism is relatively shallow, failure may be contained in a soil layer of known properties that extends to a shallow depth beneath the foundation. The performance of a system in poor soil conditions, on an ideal soil profile, and on improved soil profiles was explored through a series of centrifuge tests at the Center for Earthquake Engineering Simulation at Rensselaer Polytechnic Institute. The shallow soil improvement, evaluated in terms of moment-rotation and settlement-rotation response, proved quite effective even when its thickness was limited to 25% of the footing width. Some interesting similarities between poor, improved and ideal systems were observed in terms of cyclic moment capacity, contact pressure at the soil-foundation interface, and soil-foundation effective contact area. It is shown that even when uplifting is substantial and only 25% of the footing surface remains in contact with the soil, behavior in all four examined cases is quite stable—an important finding in seismic design of rocking foundations.
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Acknowledgments
The financial support for this paper was provided to Prof. G. Gazetas under the DARE research project, which is funded through the European Research Council (ERC) IDEAS Programme, in Support of Frontier Research–Advanced Grant, under contract/number ERC–2–9–AdG228254–DARE.
References
Abdoun, T., El-Shamy, U., Bennett, V., Tessari, A., and Lawler, J. (2013). “Multi-institutional physical modeling learning environment for geotechnical engineering education.” Proc., 120th ASEE Annual Conf. and Exposition, American Society for Engineering Education, Washington, DC.
Adamidis, O., Gazetas, G., Anastasopoulos, I., and Argyrou, C. H. (2014). “Equivalent-linear stiffness and damping in rocking of circular and strip foundations.” Bull. Earthquake Eng., 12(3), 1177–1200.
Allotey, N., and El Naggar, M. H. (2003). “Analytical moment-rotation curves for rigid foundations based on a Winkler model.” Soil Dyn. Earthquake Eng., 23(5), 367–381.
Allotey, N., and El Naggar, M. H. (2008). “An investigation into the Winkler modeling of the cyclic response of rigid footings.” Soil Dyn. Earthquake Eng., 28(1), 44–57.
Anastasopoulos, I., Gazetas, G., Loli, M., Apostolou, M., and Gerolymos, N. (2010). “Soil failure can be used for seismic protection of structures.” Bull. Earthquake Eng., 8(2), 309–326.
Anastasopoulos, I., Kourkoulis, R., Gelagoti, F., and Papadopoulos, E. (2012). “Rocking response of SDOF systems on shallow improved sand: An experimental study.” Soil Dyn. Earthquake Eng., 40, 15–33.
Anastasopoulos, I., Loli, M., Georgarakos, T., and Drosos, V. (2013). “Shaking table testing of rocking-isolated bridge pier on sand.” J. Earthquake Eng., 17(1), 1–32.
ASCE. (2000). Prestandard and commentary for the seismic rehabilitation of buildings, FEMA, Reston, VA.
BSSC (Building Seismic Safety Council). (1997). NEHRP guidelines for the seismic rehabilitation of buildings, Washington, DC.
Butterfield, R., and Gottardi, G. (1994). “A complete three-dimensional failure envelope for shallow footings on sand.” Géotechnique, 44(1), 181–184.
Chen, Y. H., Liao, W. H., Lee, C. L., and Wang, Y. P. (2006). “Seismic isolation of viaduct piers by means of a rocking mechanism.” Earthquake Eng. Struct. Dyn., 35(6), 713–736.
Cremer, C., Pecker, A., and Davenne, L. (2002). “Modeling of nonlinear dynamic behavior of a shallow strip foundation with macroelement.” J. Earthquake Eng., 6(2), 175–211.
Deng, L., Kutter, B. L., and Kunnath, S. K. (2012). “Centrifuge modeling of bridge systems designed for rocking foundations.” J. Geotech. Geoenviron. Eng., 335–344.
Drosos, V., Georgarakos, T., Loli, M., Anastasopoulos, I., Zarzouras, O., and Gazetas, G. (2012). “Soil-foundation-structure interaction with mobilization of bearing capacity: An experimental study on sand.” J. Geotech. Geoenviron. Eng., 1369–1386.
El Ganainy, H., Tessari, A., Abdoun, T., and Sasanakul, I. (2014). “Tactile pressure sensors in centrifuge testing.” Geotech. Test. J., 37(1), in press.
Gajan, S., and Kutter, B. L. (2008). “Capacity, settlement and energy dissipation of shallow footings subjected to rocking.” J. Geotech. Geoenviron. Eng., 1129–1141.
Gajan, S., and Kutter, B. L. (2009). “Contact interface model for shallow foundations subjected to combined cyclic loading.” J. Geotech. Geoenviron. Eng., 407–419.
Gajan, S., Phalen, J. D., Kutter, B. L., Hutchinson, T. C., and Martin, G. (2005). “Centrifuge modeling of load deformation behavior of rocking shallow foundations.” Soil Dyn. Earthquake Eng., 25(7–10), 773–783.
Gazetas, G., and Apostolou, M. (2004). “Nonlinear soil-structure interaction: Foundation uplifting and soil yielding.” Proc., 3rd joint U.S.-Japan Workshop on Soil-Structure Interaction, Menlo Park, CA, 60–66.
Gelagoti, F., Kourkoulis, R., Anastasopoulos, I., and Gazetas, G. (2012a). “Rocking isolation of low rise frame structures founded on separate footings.” Earthquake Eng. Struct. Dyn., 41(7), 1177–1197.
Gelagoti, F., Kourkoulis, R., Anastasopoulos, I., and Gazetas, G. (2012b). “Rocking-isolated frame structures: Margins of safety against toppling collapse and simplified design approach.” Soil Dyn. Earthquake Eng., 32(1), 87–102.
Gourvenec, S. (2007). “Shape effects on the capacity of rectangular footings under general loading.” Géotechnique, 57(8), 637–646.
Gourvenec, S., and Randolph, M. F. (2003). “Effect of strength non-homogeneity on the shape and failure envelopes for combined loading of strip and circular foundations on clay.” Géotechnique, 53(6), 527–533.
Ha, D., et al. (2008). “Centrifuge modeling of earthquake faulting effects on buried HDPE pipelines crossing fault zones.” J. Geotech. Geoenviron. Eng., 1501–1515.
Harden, C., and Hutchinson, T. (2006). “Investigation into the effects of foundation uplift on simplified seismic design procedures.” Earthquake Spectra, 22(3), 663–692.
Kawashima, K., and Hosoiri, K. (2005). “Rocking isolation of bridge columns on direct foundations.” J. Earthquake Eng., 6(2), 395–414.
Kourkoulis, R., Anastasopoulos, I., Gelagoti, F., and Kokkali, P. (2012a). “Dimensional analysis of SDOF system rocking on inelastic soil.” J. Earthquake Eng., 16(7), 995–1022.
Kourkoulis, R., Gelagoti, F., and Anastasopoulos, I. (2012b). “Rocking isolation of frames on isolated footings: design insights and limitations.” J. Earthquake Eng., 16(3), 374–400.
Martin, G., and Lam, I. P. (2000). “Earthquake resistant design of foundations: Retrofit of existing foundations.” Proc., GeoEngineering 2000 Conf., International Society for Rock Mechanics, Salzburg, Austria, 19–24.
Mergos, P. E., and Kawashima, K. (2005). “Rocking isolation of a typical bridge pier on spread foundation.” J. Earthquake Eng., 9(S2), 395–414.
Negro, P., Paolucci, R., Pedretti, S., and Faccioli, E. (2000). “Large-scale soil-structure interaction experiments on sand under cyclic loading.” Proc., 12th World Conf. on Earthquake Engineering, Auckland, New Zealand, 517–523.
Paikowsky, S. G., Palmer, C. J., and Dimillio, A. F. (2000). “Visual observation and measurement of aerial stress distribution under a rigid strip footing.” Performance Confirmation of Constructed Geotechnical Facilities, ASCE, Reston, VA, 148–169.
Palmer, M. C., O’Rourke, T. D., Olson, N. A., Abdoun, T., Ha, D., and O’Rourke, M. J. (2009). “Tactile pressure sensors for soil-structure interaction assessment.” J. Geotech. Geoenviron. Eng., 1638–1645.
Palmer, M. C., O’Rourke, T. D., Stewart, H. E., O’Rourke, M. J., and Symans, M. (2006). “Large displacement soil-structure interaction test facility for lifelines.” Proc., 8th U. S. National Conf. on Earthquake Engineering and 100th Anniversary Earthquake Conf. Commemorating the 1906 San Francisco Earthquake, EERI, San Francisco, 1237–1242.
Panagiotidou, A. I., Gazetas, G., and Gerolymos, N. (2012). “Pushover and seismic response of foundations on stiff Clay: Analysis with P-Delta effects.” Earthquake Spectra, 28(4), 1589–1618.
Paolucci, R. (1997). “Simplified evaluation of earthquake induced permanent displacements of shallow foundations.” J. Earthquake Eng., 1(3), 563–579.
Paolucci, R., Shirato, M., and Yilmaz, M. T. (2008). “Seismic behavior of shallow foundations: Shaking table experiments versus numerical modeling.” Earthquake Eng. Struct. Dyn., 37(4), 577–595.
Pecker, A. (1998). “Capacity design principles for shallow foundations in seismic areas.” Proc., 11th European Conf. on Earthquake Engineering, Paris, 2, 303–308.
Pecker, A., and Pender, M. (2000). “Earthquake resistant design of foundations: New construction.” Proc., GeoEngineering 2000 Conf., Melbourne, Australia, 313–332.
Podoloff, R. M., and Benjamin, M. (1989). “Tactile sensor for analyzing dental occlusion.” SOMA Eng. Human Body, 3(3), 1–6.
Raychowdhury, P., and Hutchinson, T. C. (2009). “Performance evaluation of a nonlinear Winkler-based shallow foundation model using centrifuge test results.” Earthquake Eng. Struct. Dyn., 38(5), 679–698.
Sakellaraki, D., and Kawashima, K. (2006). “Effectiveness of seismic rocking isolation of bridges based on shake table tests.” Proc., 1st European Conf. on Earthquake Engineering and Seismology, Geneva, 1–10.
Shirato, M., Kouno, T., Asai, R., Nakatani, S., Fukui, J., and Paolucci, R. (2008). “Large-scale experiments on nonlinear behavior of shallow foundations subjected to strong earthquakes.” Soils Found., 48(5), 673–692.
Tekscan, Inc. (2012). I-scan & high speed I-scan user manual v.7.5x, Cambridge, MA.
TEMA Automotive Lite 3.5-016 [Computer software]. Sweden, Image Systems.
Tessari, A., Abdoun, T., Sasanakul, I., and Wroe, E. (2014). “Boundary corrected calibration of tactile pressure sensors.” Proc., Int. Conf. on Physical Modelling in Geotechnics, Perth, Australia, 331–336.
Tessari, A., Sasanakul, I., and Abdoun, T. (2010). “Advanced sensing in geotechnical centrifuge models.” Proc., Int. Conf. on Physical Modeling in Geotechnics, Zurich, Switzerland, 395–400.
Wood, D. M. (2003). Geotechnical modeling, Vol. 1, Taylor & Francis, New York.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 141 • Issue 10 • October 2015
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© 2015 American Society of Civil Engineers.
History
Received: Feb 25, 2014
Accepted: Jan 30, 2015
Published online: May 15, 2015
Published in print: Oct 1, 2015
Discussion open until: Oct 15, 2015
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