364 MISCELLANEOUS STRUCTURES 



Add for floors, viz.: 



Main floors, banks and galleries 105.0 " " " " " 



Attic floors 60.0 " " " " 



CASE II. 



Wooden deck and gravel of roof 17.5 Ibs. per sq. ft., vertically 



Steel 12.5 " " " " 



Snow 10. o " " " " " 



Total 40.0 " " " " 



Wind pressure over entire elevation of 



wall and roof of 30.0 Ibs. per sq. ft., horizontally 



LOADS ON PURLINS. 



Wooden deck and gravel of roof 17.5 Ibs. per sq. ft., vertically 



Steel 3.5 " " " " 



Snow and wind 25 . o " 



(( (I (( 



Total 46.0 " " " " 



LOADS ON FLOOR BEAMS, GIRDERS AND COLUMNS off' MAIN FLOORS. 



Banks and galleries, beams 140 Ibs. per sq. ft. 



Banks and galleries, girders 112 " " " 



Banks and galleries, columns 105 " " " " 



Attic floors beams, columns and girders 60 " " " " 



For the main trusses, in addition to the stresses of Case II., there 

 was added the stress due to the wind bracing between these trusses. 



For the radial trusses, in addition to loading of Case II., there 

 was assumed an additional load of 50,000 pounds supposed to act up 

 or down at the upper point of truss ; this load being what was assumed 

 probable in case there was slight unequal settlement of the footings. 



For the half ring connecting the tops of the radial trusses there 

 was another case assumed, beside Cases I. and II. viz., a tHrust of 

 50,000 pounds at any point of the half ring ; this being the thrust of a 

 radial truss under its full live and wind load. 



All the material used was of medium steel, excepting the rivets, 

 which were made of soft steel. Both material and workmanship con- 

 form to manufacturer's standard specifications. 



