PRESSURE; OF WALLS ON FOUNDATIONS 



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or piers. The first method is now the most common one for mill build- 

 ing foundations. 



Pressure of Walls on Foundations. In Fig. 133, let W = re- 

 sultant weight of the wall, the footing and the load on the wall, 

 / = length of the footing and b = distance from center of gravity of 

 footing to point of application of load W, and let the wall be of unit 



B 



P. 



raj 



FIG. 133. 



FIG. 134. 



length. The pressure on the footing will be that due to direct load 

 W, and a couple with an arm b and a moment = + Wb. The pressure 

 due to the direct W will be 



P x = PF -f- / as shown in (a), 



