Eric Engineering bending moment of tube with bends 
This shows approximately how much side bending force there is for a given angle off of 180 degrees exerting 100lb force, total length is 48", 24" leg on each side of the bend: 
0  degrees  0.0' lbs 
15 degrees 26.1' lbs 
30 degrees 51.8' lbs 
45 degrees 76.5' lbs 
60 degrees 100.0'lbs 
75 degrees 121.8' lbs 
80 degrees 128.6' lbs 
90 degrees 141.4' lbs 
 
I will check with Eric, I think " lbs may be incorrect? 
 
I checked with Eric, it was supposed to be Foot Lbs. so I changed this note. 
 
Y13-12-02
 
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