Handbook for architects and builders . lding Ordinance provides aformula for columns that is different fromthe formulas used in computing the columntables in the steel hand books and the fol-lowing diagram enables the tables in thosebooks to be used for Chicago conditions. 199 Arnold Hinkens, President G. A. Kuehl, Vice-Pres. PHONE YARDS 1265 Conrad Braun, Treas. Cf Secy Butler Street Foundry S Iron Company Structural and Architectural Steel and Iron Work All kinds of Boiler and General Castings 3422-32 Butler Street3423-43 Parnell Avenue CHICAGO VARIETY MANUFACTURING CO. Manufacturers of FIRE
Handbook for architects and builders . lding Ordinance provides aformula for columns that is different fromthe formulas used in computing the columntables in the steel hand books and the fol-lowing diagram enables the tables in thosebooks to be used for Chicago conditions. 199 Arnold Hinkens, President G. A. Kuehl, Vice-Pres. PHONE YARDS 1265 Conrad Braun, Treas. Cf Secy Butler Street Foundry S Iron Company Structural and Architectural Steel and Iron Work All kinds of Boiler and General Castings 3422-32 Butler Street3423-43 Parnell Avenue CHICAGO VARIETY MANUFACTURING CO. Manufacturers of FIRE PROOF DOORS Phone West 3023 CHICAGO, ILLINOIS STROBEL STEEL CONSTRUCTION CO Engineers and Contractors DESIGNERS AND BUILDERS OF BRIDGES AND STRUCTURAL IRON WORK BASCULE BRIDGES 1744-8 Monadnock Block TELEPHONE HARRISON 393 CHICAGO. ILL, F. P. SMITH WIRE AND IRON WORKS \S,rtr^^% Office, Lake and Dearborn St$., CHICAGO ORNAMENTAL IRON and BRONZE Art Metal WorK, Iron Fences, Stairs, Stable Fixtures, Jail Guards, Fire Escapes, Wire Cloth. Patent Spiral Columns and Other Steelfor Concrete Reinforcement Shops and FoundryCHESTER ST. AND CLYBOURN AVE. SEND FOR CATALOGUESolo Agents for Duplex Joist. Wall and I Beam Hangers and Post Caps 200 The followingr formulas are used in Chi-cago for steel columns: Ordinary steel col- 1umns; stress = 16000 — 70 —- rColumns encased in concrete; stress = 180001— 70 — but not exceeding 16000 lbs. per rsq. formula used in the Bethlehem hand 1book; stress = 16000 — 55— with a fiber rstress of 13000 lbs. under 55 radii. 1Carnegie; stre.^s — 17100 — 57—, with a rfiber stress of 12000 lbs. under 90 ; The Gordon formula for ultimatestrength recommended to be used with afactor of safety of 4. It is as follows forcolumns witli square ends:50,000 1 +? (12L)- 36000 r^ In tliese formulas 1 = length of column ininches. r = least radius of gyration ininclies. To use the diagram look up in the liandbooks the size of column of
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