FOUNDATIONS 



315 



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In the method of placing the steel reinforcement shown 

 in Figs. 1 and 2 (a), it will be observed that the corners of 

 the footings are subjected to great moment. Therefore, in 

 order to strengthen the 

 corners of the footing, 

 the reinforcing rods 

 are frequently ar- 

 ranged as shown in 

 Fig. 2 (6). 



The steel reinforce- 

 ment of column foot- 

 ings is never painted, 

 even if the footings 

 are to be placed in 

 damp situations. 

 Coating the bars will 

 partly destroy the 

 bond that it is neces- 

 sary to maintain be- 

 tween the concrete 

 and steel; besides, the 

 concrete is sufficient 

 protection for the steel 

 against any serious 

 corrosion. In all in- 

 stances, however, the 

 steel bars should be 

 cut off enough to allow 

 the ends to be entirely 

 protected. 



Spread Footings for 

 Outside Columns. In- 

 stead of a continuous 

 footing, isolated spread 

 footings are frequently 

 used in outside, or wall, 

 columns. Such footings are illustrated in Fig. 3 . The position 

 that the footings occupy on the building plan is shown, the 

 wall footing being at a and the corner footing at b. 



FIG. 2 



