126 



QUESTIONS AND PROBLEMS. CHAPTER VI. 



required net area of the flange proper, if the working stress in 



tension is 10000 Ibs. per sq. in.? 



Ans. 52.97 in. effective depth. 108800 Ibs, equiv. flange 

 stress. 7.96 or 8.69 sq. ins. flange area (net) . 



45. If in the above problem, the maximum shear is 48000 

 lbs. ; what is the maximum shearing stress per square inch? 



46. If the modulus of rupture in cross-breaking of Georgia 

 pine is 7000 Ibs. per sq. in., what will be the bending moment 

 in a beam at rupture, its cross section being 10" wide and 12" 

 deep? 



