250 



PRACTICAL STRUCTURAL DESIGN 



r x = 0.19 h 



! -TT r x =0.3lh 



l r y a0 ^ l> 



H- b-H 15 



r x = (MO h 

 h-mean h 



_ 1 j 



^^* " 



as 



if 

 1 1 



*=-*! No.7,6,9 



--- 



r y =0.16b 



A 

 ^^- 



r x = 15 h 



= 0.42 h 

 ry=Sameas 



' 6 ' 9 15 



17 





r--- b 



16 



0.31 h 



K b 



r= 0.197 b 



5 



>[ r y 0.11 b 



19 



Tr x =0.36h 

 J r y = 0.45 b 

 ,-b-H 16 



T r K =0.38h 

 V r q = O.ZZb 

 30 



b i . 

 "" " r * g ' 31 h 



0.215 b 



3 



C 



si 



K~ b --->( 



|ir"T r x = 0.32 h 



ir 



h 



32 



r x = 0.39 h 

 r* 0.55 b 



- 

 | 



f- 



= 0.435 h 

 H ru-0.25 b 

 33 



t--b--^ 



o.n 



10 



k- b M 



El 



= 0.41 h 



22 



V0.39h 



k-- 



-rr x = 0.25 h 

 1? r q =0.2l b 





35 



\/ r x = 0.21 h 

 ~miJF* r y =0.2l b 

 y x l r.= 0.53H 



z Y 12 



ry 



ru=-0.25b 



14 



b= Width of Section 

 Parallel to Axis X~X 

 h- Height of Section 

 Parallel to Axis Y-Y 



Fig. 163 Approximate Radii of Gyration 'V 



