Related Resources: civil engineering
To resist a beam reaction, the minimum bearing length N in the direction of the beam span for a bearing plate is determined by equations for prevention of local web yielding and web crippling.
A larger
N
is generally desirable but is limited by the available wall thickness.
When the plate covers the full area of a concrete support, the area, in
2
(mm
2
), required by the bearing plate is:
where
R =
beam reaction, kip (kN), f '
c
specified compressive strength of the concrete, ksi (MPa). When the plate covers less than the full area of the concrete support, then, as determined from Table A,
Table A
Allowable Bearing Stress, F
p
where:
A
2
full cross-sectional area of concrete support, in
2
(mm
2
).
With
N
established, usually rounded to full inches (millimeters), the minimum width of plate
B
, in (mm), may be calculated by dividing
A
1
by
N
and then rounded off to full inches (millimeters), so that
BN > or =
A
1
. Actual bearing pressure
f
p
, ksi (MPa), under the plate then is f
p
, ksi (MPa), under the plate is:
The plate thickness usually is determined with the assumption of cantilever bending of the plate:
where:
t =
minimum plate thickness, in (mm)
k =
distance, in (mm), from beam bottom to top of
web fillet
f
b
= allowable bending stress of plate, ksi (MPa)
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