MILL CONSTRUCTION BUILDINGS _ 



Shear 



4 

 P = bds ....................... (9) 



3 



Deflection 



TWO EQUAL CONCENTRATED LOADS AT THE 

 THIRD POINTS OF GIRDER 



Bending 



<> 



Shear 



P = bds (13) 



3 



Deflection 



184.4PP 

 Ebd 3 



To find the value of W, multiply the length of the girder 

 between supports in feet by the distance between centers of 

 floor panels on each side of the girder in feet. Then multiply 

 this result by the dead and live load to be carried in pounds 

 per square foot of floor area. This same mode of procedure 

 may be used to find the amount of load on each intermediate 

 beam, using the length of the beam and the half panels of floor 

 on each side of the beam. 



The amount of the concentrated load P at a given point 

 due to intermediate beams supported by a girder may be found 

 by taking one-half of the total uniform load on each interme- 

 diate beam supported at that point. 



Both the bending and shear formulas should be tested in 

 determining the proper size of a girder or beam, or the amount 

 of load which may be carried safely. Stiffness is determined 

 by the formulas for deflection. 



The bearing area needed at the ends of girders may be 

 found by dividing the reaction at a given end by the working 

 compressive strength across the grain for the timber used. If 



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