28 July 2005
Generally, apply uniform and concentrated live loads in a logical manner.
Designated uniform live loadings and concentrated live loading from pneumatic-tired
equipment should not be applied simultaneously in the same area. However,
uniform live load should be assumed between crane tracks (for 80 percent of gage).
When railroad tracks are present between crane tracks, both track loads should be
applied simultaneously. However, the maximum loads from each track need not be
assumed. Unique operations may warrant a more conservative approach, i.e, during
a "trans-shipment operation (handling of fuel containers), there could be a portal
crane straddling a railroad car loaded with a container, with another container sitting
on the pier deck in the immediate vicinity.
For determining the shear and bending moments in continuous members, apply the
designated uniform loadings only on those spans that produce the maximum effect.
Concentrated loads from trucks, mobile cranes, forklifts, and straddle carriers,
including mobile crane float loads, are generally critical for the design of short spans
such as deck slabs and trench covers. Uniform loading, mobile crane float loading,
rail-mounted crane loading, and railroad loading are generally critical for the design
of beams, pile caps, and supporting piles.
Procedures for calculation of berthing loads are found in paragraph 5-2 of this UFC.
Procedures for calculation of mooring loads are found in UFC 4-159-03.
Wind Loads on Structures.
Use Section 1609 of the International Building Code to provide minimum wind load
Loads on Piles.
In addition to the axial loads, bending moments, and shears caused by lateral loads
at deck level due to berthing, mooring and seismic forces, piles are also subjected to
other types of lateral loads acting along the length of the pile.
Current and Waves.