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# Bearing Plates

To resist a beam reaction, the minimum bearing length N in the direction of the beam span for a bearing plate is deter- mined 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

A 1= R/0.35fc
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 by following table

where A2= full cross-sectional area of concrete support, in2(mm2 ).

With N established, usually rounded to full inches (millimeters), the minimum width of plate B, in (mm), may be calculated by dividing A1 by N and then rounded off to full inches (millimeters), so that BN >=A1. Actual bearing pressure fp, ksi (MPa), under the plate then is
fp=R/BN

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
Fb= allowable bending stress of plate, ksi (MPa)

### Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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## 2 comments on "Bearing Plates"

T.R. Sasthakumaran says:

This sites is very useful in civil family

Kapil Kapoor says:

What does structural change means in civil engineering. Does a non bearing wall comes under structural change.