Ship Loader Platforms Using a Pile/Micropile System

In 2008, a condition survey indicated that major structural improvements were necessary to extend the service life of the 50-year-old United Harvest grain import/export dock located on the Columbia River at the Port of Kalama in Kalama, Washington. Rather than repair the dock, the owner elected to replace it, modernize the dockside grain-handling equipment, and install two 150-foot [45.7 m] boom fixed-tower ship loaders to increase the ship loading rate from 1,200 metric tons per hour (mtph) [1,323 short tons per hour (stph)] to 3,200 mtph [3,527 stph]. To support the towers and resist the ship berthing and mooring loads, two new batter pile-supported concrete platforms were constructed. Because the riverbed at the site consisted of approximately 65 feet [20 m] of highly liquefiable sand over solid basalt, a micropile was installed inside each batter pile and pretensioned into the basalt to resist the high-tension loads on the piles. By setting the lock-off load equal to just greater than the maximum non-seismic tensile demand of each pile, the micropile force/displacement response exhibited a bilinear behavior under tensile loads. The tensile strain of the pile/micropile system increases when the non-seismic forces are overcome, and this behavior is used to reduce seismic forces on the platform. This paper focuses on the selection of the fixed-tower ship loaders, the design of the ship loader platforms, and the pile/micropile bilinear response and its incorporation into the design per the International Building Code (IBC).

• Record URL:
  https://doi.org/10.1061/9780784413067.076
• Availability:
  • Find a library where document is available. Order URL: http://www.asce.org/Product.aspx?ID=2147487569&ProductID=192556110
• Supplemental Notes:
  • © 2013 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Galloway, Joe
  • Mjelde, Jon
  • Allen, Bill
• Conference:
  • Ports '13: 13th Triennial International Conference
  • Location: Seattle Washington, United States
  • Date: 2013-8-25 to 2013-8-28
• Publication Date: 2013-8

Language

• English

Media Info

• Media Type: Web
• Pagination: pp 735-744
• Monograph Title: Ports 2013: Success through Diversification

Subject/Index Terms

• TRT Terms: Loaders; Offshore platforms; Structural design; Support piles; Tension
• Geographic Terms: Kalama (Washington)
• Subject Areas: Design; Marine Transportation; Terminals and Facilities; I20: Design and Planning of Transport Infrastructure;

Filing Info

• Accession Number: 01522319
• Record Type: Publication
• ISBN: 9780784413067
• Files: TRIS, ASCE
• Created Date: Apr 22 2014 3:04PM