KINEMATIC SOIL-STRUCTURE INTERACTION FROM STRONG MOTION RECORDINGS

Strong earthquake motion recordings from 29 sites with instrumented structures and free-field accelerographs are used to evaluate variations between foundation-level and free-field ground motions. The paper focuses on structures with surface and shallowly embedded foundations. The foundation/free-field ground motion variations are quantified in terms of frequency-dependent transmissibility function amplitude |H|. Procedures are developed to fit to |H| analytical models for base slab averaging for the assumed conditions of a rigid base slab and a vertically propagating, incoherent incident wave field characterized by ground motion incoherence parameter K. The limiting assumptions of the model are not strictly satisfied for actual structures, and the results of the identification are apparent K values (denoted K sub-a) that reflect not only incoherence effects, but also possible foundation flexibility and wave inclination effects. Nonetheless, a good correlation is found between K sub-a values and soil shear wave velocity for sites with stiff foundation systems. Based on these results, recommendations are made for modifying free-field ground motions to estimate base slab motions for use in response analyses of structures.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3519342
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Kim, Sanling
  • Stewart, J P
• Publication Date: 2003-4

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 323-335
• Serial:
  • Journal of Geotechnical and Geoenvironmental Engineering
  • Volume: 129
  • Issue Number: 4
  • Publisher: American Society of Civil Engineers
  • ISSN: 1090-0241
  • Serial URL: http://ojps.aip.org/gto

Subject/Index Terms

• TRT Terms: Earthquake engineering; Foundation engineering; Foundation soils; Geotechnical engineering; Kinematics; Seismicity; Soil mechanics; Soil structure interaction; Wave motion
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure; I24: Design of Bridges and Retaining Walls; I42: Soil Mechanics;

Filing Info

• Accession Number: 00941026
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 8 2003 12:00AM