Displacement Demands and Shear Key Forces in Pile-Supported Marginal Wharves with Strong Lateral-Torsional Coupling

Pile-supported marginal wharves have geometrical characteristics that make them prone to torsional response when subjected to earthquake induced inertial forces. Because of expected early system non-linear response due to the soil-structure interaction, lateral displacement demands on the piles cannot readily be estimated from conventional elastic modal response spectrum analyses and modal combination techniques. These displacement demands may be obtained using non-linear time-history analysis. Nevertheless, modeling the non-linear response of the wharf is still impractical in many design offices. For this reason, simple approximate methods that can estimate the critical pile displacement demand as the spectral displacement corresponding to a predominant translational (transverse) mode natural period of the wharf multiplied by a Displacement Magnification Factor (DMF) is adequate for design purposes. This paper revisits the earlier work of Benzoni and Priestley (2003) and computes, through non-linear timehistory analysis, DMFs of short, long and linked segment wharves. Furthermore, the paper also reports shear key forces observed in the non-linear analyses of linked segment wharves. Finally, equations are proposed for calculating the DMFs and to estimate the forces for the design of shear keys.

• Availability:
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• Supplemental Notes:
  • Abstract reprinted with permission from the American Concrete Institute
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Blandón, Carlos
  • Restrepo, José I
  • Jaradat, Omar
• Conference:
  • ACI Convention, Spring 2013
  • Location: Minneapolis MN
  • Date: 2013-4-14 to 2013-4-18
• Publication Date: 2013

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Glossary; References; Tables;
• Pagination: pp 131-148
• Monograph Title: Recent Advances in the Design of Prestressed Concrete Piles in Marine Structures in Seismic Regions

Subject/Index Terms

• TRT Terms: Concrete structures; Dislocation (Geology); Earthquake resistant design; Shear strength; Support piles; Torsion; Wharves
• Subject Areas: Bridges and other structures; Design; Marine Transportation; Materials; I32: Concrete;

Filing Info

• Accession Number: 01502158
• Record Type: Publication
• ISBN: 9780870318450
• Files: TRIS
• Created Date: Dec 23 2013 10:38AM