Tests of concrete and reinforced concrete wall footings . ion fairures they are notas effective for this purpose as turned up corrugated bars. Increasing the length of the footing decreases the strengthof the piece for the same per cent of reinforcement. The compari-son is not strictly accurate as a different spacing of the springswas used in the longer test pieces. From this series of tests the following values are safeworking stresses to be used in the design of footings: Tension in plain concrete, extreme fiber, 1-3-6 nn 45 lb. per sq. in. Tension in plain concrete, extreme fiber, 1 - 2 - 4
Tests of concrete and reinforced concrete wall footings . ion fairures they are notas effective for this purpose as turned up corrugated bars. Increasing the length of the footing decreases the strengthof the piece for the same per cent of reinforcement. The compari-son is not strictly accurate as a different spacing of the springswas used in the longer test pieces. From this series of tests the following values are safeworking stresses to be used in the design of footings: Tension in plain concrete, extreme fiber, 1-3-6 nn 45 lb. per sq. in. Tension in plain concrete, extreme fiber, 1 - 2 - 4 60 lb. per sq. in. Vertical shearing stress at edge of pier, reinforced footings .... 100 lb. per sq. in. Bond stress at edge of pier, round rods ......«« .... 100 lb. per sq. in. Bond stress at edge of pier, corrugated bars .... 150 lb. per sq. in. Tension in steel, medium 16,000 lb. per sq. in. Tension in steel, high elastic limit .... 20,fior> lb. per sq. in concrete 400 lb. per sq. in. 1601 1602 1605 -34- 1 1606 L 1611 1618 -35-. ir>r5i -36-testsofconcreter00bres
Size: 1193px × 2095px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectco, booksubjecttheses
