Model tests on horizontal pile-to-pile interaction incorporating local non-linearity and resonance effects

• Published in: Soil dynamics and earthquake engineering (1984) Vol. 48; pp. 175 - 192
• Main Authors: Goit, Chandra Shekhar, Saitoh, Masato, Mylonakis, George, Kawakami, Hideji, Oikawa, Hiroki
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2013
• Subjects: Amplitudes; Dynamical systems; Horizontal; Loads (forces); Mathematical analysis; Mathematical models; Nonlinear dynamics; Nonlinearity; d; ωn; f′n; i=−1; fn; Ihh; s/d; ω; a0; q; β; s; ζ; ω′n; η; θ; λ; Vs
• ISSN: 0267-7261; 1879-341X
• DOI: 10.1016/j.soildyn.2013.02.002

Dynamic experimental studies on horizontal interaction factors for laterally loaded model soil–pile systems subjected to low-to-high amplitude pile head loading are reported, focusing on the effect of dynamics and local non-linearity. Results obtained from dynamic experiments with different amplitudes of harmonic lateral loading on instrumented model soil–pile systems conducted on a shaking table indicate that the resonance of soil–pile system shows a profound impact on the horizontal interaction factors. Furthermore, behavior of the soil–pile system becomes highly non-linear with increasing amplitude of loading, as the extent of local non-linearity around the pile increases. Consequently, group effects cannot be predicted by using established approximate equations based on the assumption of linear viscoelastic behavior. To this end, new semi-empirical equations are proposed for obtaining the horizontal interaction factors, as an extension of available approximate equations to incorporate the local non-linear behavior of soil–pile system for both small and large pile spacings. ► Horizontal pile-to-pile interaction factors are measured experimentally. ► Range of dynamic loads is used to induce low-to-high shear strains in soil. ► Local non-linearity and resonance effects of soil show profound impact on results. ► Existing approximate solutions cannot account for local soil non-linearity. ► Equations for approximation incorporating local soil non-linearity are proposed.