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Title: Nonlinear dynamics induced in a structure by seismic and environmental loading

In this study,we show that under very weak dynamic and quasi-static deformation, that is orders of magnitude below the yield deformation of the equivalent stress strain curve (around 10 -3), the elastic parameters of a civil engineering structure (resonance frequency and damping) exhibit nonlinear softening and recovery. These observations bridge the gap between laboratory and seismic scales where elastic nonlinear behavior has been previously observed. Under weak seismic or atmospheric loading, modal frequencies are modified by around 1% and damping by more than 100% for strain levels between 10 -7 and 10 -4. These observations support the concept of universal behavior of nonlinear elastic behavior in diverse systems, including granular materials and damaged solids that scale from millimeter dimensions to the scale of structures to fault dimensions in the Earth.
Authors:
 [1] ; ORCiD logo [2] ;  [1]
  1. Univ. of Grenoble Alpes, Grenoble (France). Inst. des Sciences de la Terre
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-22561
Journal ID: ISSN 0001-4966
Grant/Contract Number:
AC52-06NA25396; 227507
Type:
Accepted Manuscript
Journal Name:
Journal of the Acoustical Society of America
Additional Journal Information:
Journal Volume: 140; Journal Issue: 1; Journal ID: ISSN 0001-4966
Publisher:
Acoustical Society of America
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); European Research Council (ERC)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Earth Sciences; Nonlinear elasticity; nonlinear dynamics in materials; nonlinear damping; slow dynamics; UCLA Factor building
OSTI Identifier:
1340925