A Consistent Soil Fatigue Framework Based on the Number of Equivalent Cycles |
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| Authors: | Nii Allotey M Hesham El Naggar |
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| Institution: | (1) Department of Civil & Environmental Engineering, Faculty of Engineering, University of Western Ontario, London, ON, Canada, N6A 5B9;(2) Research and External Relations, Faculty of Engineering, University of Western Ontario, London, ON, Canada, N6A 5B9 |
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| Abstract: | Cyclic soil degradation and hardening affects soil stiffness and strength, and is linked to an increase or decrease in the
mean effective confining stress due to void ratio or pore pressure changes. This change of state can be explicitly modeled
by using effective stress methods, or implicitly modeled using total stress methods. In the latter, this is achieved by using
empirical functions based on the number of loading cycles that are derived from constant-amplitude stress or strain laboratory
tests. To suite generalized loading conditions, these functions must be extrapolated to variable-amplitude loading. This falls
under the general class of a fatigue-based problem. The main focus of this paper is to present a generalized consistent soil
fatigue formulation for soils under cyclic loading. The paper then goes on to discuss the implementation of various cyclic
soil degradation and hardening models reported in the literature, and highlights their important underlying assumptions, capabilities
and limitations. |
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| Keywords: | Degradation Hardening Fatigue Damage function Cyclic Earthquake Soils Palmgren– Miner rule Liquefaction Equivalent number of cycles |
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