28 July 2005
It is anticipated that the guidance for the seismic design of piers and wharves will be
further developed and updated in FY-05. In the interim, it is recommended that the
following guidance be followed.
Determine Seismic Use Group:
a. SUG III: Structures having significant importance and where the impact of
being out of operation is critical (High Risk).
b. SUG II: Structures having moderate importance where the impact of
being out of operation for repairs is tolerable (Moderate Risk).
c. SUG I: Structures not falling into SUG III, or II (Low Risk).
Determine Seismic Design Category:
(Based on International Building Code, 2003, Table 1616.3)
Determine Seismic Analysis Procedure:
Note A: Performance Based Seismic Design not required. Lateral loads from berthing and
mooring of vessels will likely govern the design. Determine seismic forces utilizing the
Equivalent Lateral Force procedure from ASCE 7-02 paragraph 9.5.5 and utilizing the
Design earthquake motion corresponding to Seismic Performance Level 2 as defined in
Table 4-2 of Marine Oil Terminal Engineering and Maintenance Standards, June 2003,
California State Lands Commission Marine Facilities Division
Note B: Performance Based Seismic Design required according to the provisions of Marine
Oil Terminal Engineering and Maintenance Standards, June 2003, California State Lands
Commission Marine Facilities Division as described below. The seismic criteria within this
reference was provided by John Ferritto of the Naval Facilities Engineering Services Center
(NFESC) through a Cooperative Research and Development Agreement, and based
primarily on Seismic Criteria for California Marine Oil Terminals, Vol.1 and Vol.2, April 1999,
Technical Report TR-2103-SHR, Naval Facilities Engineering Service Center, Port
Hueneme, CA, which developed and expanded upon Design Criteria for Earthquake Hazard
Mitigation of Navy Piers and Wharves
, February 1997, Technical Report TR-2069-SHR,
Naval Facilities Engineering Service Center, Port Hueneme, CA.