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// CODE SNIPPET

3103F.6.6 Effective Mass or Virtual Mass Coefficient (CM)

California Building Code 2016 (Vol 1 & 2) > 31F [SLC] Marine Oil Terminals > 3103F Structural Loading Criteria > 3103F.6 Berthing Loads > 3103F.6.6 Effective Mass or Virtual Mass Coefficient (CM)
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In determining the kinetic energy of a berthing vessel, the effective or the virtual mass is the sum of vessel mass and hydrodynamic mass. The hydrodynamic mass does not necessarily vary with the mass of the vessel, but is closely related to the projected area of the vessel at right angles to the direction of motion.
Other factors, such as the form of vessel, water depth, berthing velocity, and acceleration or deceleration of the vessel, will have some effect on the hydrodynamic mass. Taking into account both model and prototype experiments, the effective or virtual mass coefficient can be estimated as:
(3-20)
where:
dactual =Actual arrival draft of the vessel
B = Beam of vessel
The value of Cm for use in design should be a minimum of 1.5 and need not exceed 2.0 [3.19].

Related Code Sections


3103F.6.6 [SLC] Marine Oil Terminals, Effective Mass or Virtual Mass Coefficient (CM)
, will have some effect on the hydrodynamic mass. Taking into account both model and prototype experiments, the effective or virtual mass coefficient can ...
California Building Code 2016 (Vol 1 & 2) > 31F [SLC] Marine Oil Terminals > 3103F Structural Loading Criteria > 3103F.6 Berthing Loads > 3103F.6.6 Effective Mass or Virtual Mass Coefficient (CM)
3103F.6.6 [SLC] Marine Oil Terminals, Effective mass or virtual mass coefficient (Cm)
In determining the kinetic energy of a berthing vessel, the effective or the virtual mass is the sum of vessel mass and hydrodynamic mass. The ...
California Building Code 2019 (Vol 1 & 2) > 31F [SLC] Marine Oil Terminals > 3103F Structural Loading Criteria > 3103F.6 Berthing Loads > 3103F.6.6 Effective mass or virtual mass coefficient (Cm)
3.3.4 Seismic Evaluation Procedures for Hospital Buildings, Mass
There are no significant mass irregularities; there is no change of effective mass of more than 50 percent from one story to the next, excluding ...
California Administrative Code 2016 > 6 Seismic Evaluation Procedures for Hospital Buildings > 3 Procedures for Building Systems > 3.3 Configuration > 3.3.4 Mass
3.3.4 Seismic Evaluation Procedures for Hospital Buildings, Mass
There are no significant mass irregularities; there is no change of effective mass of more than 50 percent from one story to the next, excluding ...
California Administrative Code 2019 > 6 Seismic Evaluation Procedures for Hospital Buildings > 3 Procedures for Building Systems > 3.3 Configuration > 3.3.4 Mass
3103F.6 [SLC] Marine Oil Terminals, Berthing Loads
= Berthing Coefficient C m = Effective mass or virtual mass coefficient (see Section 3103F.6.6 ...
California Building Code 2019 (Vol 1 & 2) > 31F [SLC] Marine Oil Terminals > 3103F Structural Loading Criteria > 3103F.6 Berthing Loads
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