TM 5-850-1
b.
For railroad and crane loading, provide
due to tidal lags are usually assumed to be one-half of
the mean-tide ranges.
for longitudinal forces equal to the larger of the
f. Earthquake forces. Earthquake forces should
following: (1) Due to braking-15 percent of live loading
on any track without impact.
be considered if in an area of seismographic
(2) Due to traction-25 percent weight on the
disturbance.
g. Ice. The structure will be designed to resist all
driving wheels on any one track, without impact.
static and impact forces from ice. In some locations, ice
7-4.
Loading combinations.
may accumulate on the structure. Allowance should be
made for the effect of this accumulation upon the
stability of and upon the stresses in the structure.
Piers and wharves should be designed for a
combination of dead plus full live loading at normal
7-3.
Longitudinal loads.
allowable stresses; or a combination of dead plus full
live loading, plus lateral loading on moored ships, plus
a. In truck loading, provide for longitudinal forces
wind loading on pier and pier shed at one-third increase
in normal allowable stresses.
due to traction and breaking equal to 5 percent of the
total truck live loading in any one truck lane.
7-2
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