1927 086 Ordinance - Laserfiche WebLink

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reinforced conc.rete building or structure, complete working drativings, details and specifications shall be filed with the InspeCtor of Buildings, giving the size and location of inembers, the size ancl position of reinforced rods, stir- rups, bent rods and arW other information necessary for the-proper calculation of the.structure or buildixi;. The Iilspector of Buildings reserves the right to demand that the oT.*ner, architectil, or ergineer submit a certified copy of such computation or stress sheets for examiration upon application for a building perniit. . . The Inspec-tor of Buildi2ags -in grarit3.ng a perinit to erect an,y reinforced coricrete structure, does not, in any manner pass the construction until after tests have been made of the actual construction to ris satisfaction. Sec. 127. REINFORCFID CCNCRETE UNIT STRESSES. -mlie follotiving u nit working stresses sh'all not be exceeded. Iron in Tension, 12,000 lbs..per sq. in. R!Iediura steel in tension, 16,000 lbs. per sqo in. High carbon steel in tension, 18,000 lbs. per sqo in. CoTd.twisteci mediUm steel in tension, 18,000 lbs, per sqe in. Steel to resist diagonal tension, 10,000 lbs.,per sq. in, ConcTete in direct conpression, 500 lbsotper sqo in. Concrete in direct compression, (Spiral reinfoxced columnsj,, 650 lbso , per sq. in. . Concrete--eYtrer:e fibre in,compression, 700 lbs. per sq, in. (gs deter- mined by the straight line f'ornnlla). Bond stresses for plain bars, 70 lbs. ger sqs in. Bona stresses for twisted or defcrmed bars, 100 lbse "per. sqe in. Concrete in diagonal tension, 40 lbs. per scio in. • > i?OTF--1'he carhplessive stress in the steel shall not exceed the product of the eompressive stress in the concrete multiplie@ by the elastic modulus of the steel and divided by the elastic modulus of the concrete. . Sec.128. DESIGNS FOR SLABS, BEAMS AI3D GIRDERS. All reinforced conerete work shall be designed in accordance t:!ith standard. engineerirg practice and tle folloi7Jin.g assumptione: That the ratio of moduli of elasticity of concrete to steel is one (1) to iifteen (15):"that the adhesion of the coricrete to the steel makes the two materials act togethert that tensile stresses are taken by the steel and that the stress strain curve of concrete in compression is*a straight line. Beams, slabs e,nd girders sha.ll be calculated as coritinuous unless cons- tructed so as to act as simple beains. V'dhen continuous for uniforia loads the bending moment at the center shall 'be 'figured as not less tn.an 10 VFL for the interrsediate spans and 9 WI, for -the end spans provided at least sixty=six,(66) per cent as much reinforcement is provided at the top over supports as at the center of the member; and the reinforcement ebtends beyond the support a suf-