RELATIVE BEXDIXG STREXGTII OF CROSSARMS 



35 



Rectangular Pole Bolt Hole Section 



The most damaging position for knots in the pole bolt hole section was 

 assumed to be at the top of the section. 'rhe\- were so ligured in Calcula- 



gip^^flHIHHgtaSHHfH^^ 



^- 



35 



a 



o 



Z 



o 



I- 4 



'\ 



Ft:U:::^rt: 



CURVE I FOR 3:i:"» 4^" SECTIONS 

 CURVE 2 FOR 3^"x 4^" SECTIONS 



I 2 



KNOT DIAMETER -INCHES 



Fig. 7 — Pole bolt hole section. Section modulus of crossarm section containing knots 

 of the sizes shown on the base line and located in damaging positions. 



tion 7, the results of which are shown in Table 3 and plotted in Fig, 7 for 

 both minimum and nominal arms. 



