CONSOLIDATED STEEL CORPORATION 



167 



BEARING PLATES 



Steel bearing plates are used under the ends of steel beams resting on walls 

 to distribute the pressure on the latter. The plate must be of a sufficient size 

 so that the allowable safe pressure on the wall will not be exceeded. 



For good brick work laid in cement mortar, capable of sustaining a safe 

 pressure of 200 pounds per square inch, the table below gives standard sizes of 

 bearing plates which will suffice in general on ordinary spans for I-beams 

 to 24 up inches in depth. 



STANDARD BEARING PLATES FOR I-BEAMS 



Larger I-beams, girder beams and girders will require plates of increased 

 size. In such special cases the size of the bearing plate must be determined by 

 the area required to distribute the pressure and its thickness then obtained 

 by the following formula: 



in which 



I = thickness of plate, in inches. 

 w = width of plate perpendicular to beam, in inches. 

 6 = width of flange of beam, in inches. 

 p = allowable pressure on wall, in pounds per square inch. 

 /= allowable fiber stress in plate, in pounds per square inch. 

 For an allowable stress of 16,000 pounds per square inch the thickness of 

 the plate required can be obtained for various pressures by multiplying 

 l ), or the cantilever projection of the plate, by the following coefficients: 

 Pressure, pounds square 



inch 100 150 200 350 500 



Coefficient. 0.137 0.168 0.194 0.256 0.306 



