Accession Number:

AD0642108

Title:

HINGING IN STATICALLY AND DYNAMICALLY LOADED REINFORCED CONCRETE BEAMS

Descriptive Note:

Technical rept. Jan 1965-May 1966

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s):

Report Date:

1966-10-01

Pagination or Media Count:

101.0

Abstract:

An investigation was made of the hinging mechanism in under- reinforced concrete beams subjected to static or dynamic loads. Two test series on simply supported beams with a 6-foot span length were conducted. In one series, 11 beams were subjected to two concentrated loads symmetrically placed 18 inches apart the primary variable was the magnitude of the step load pulse 1.0 to 1.4 times the static yield load. In the other series, 15 beams were subjected to a concentrated load at midspan the primary variables were the type of load static or dynamic, the amount of tension reinforcement p0.9,1.3, and 2.0, p1p0.67, and the size of the transverse reinforcement 18- and 14-inch round bars and No. 3 deformed bars. Hinge development was similar in the statically and dynamically loaded beams and resulted from the formation and propagation of a yielded zone or zones in the tension reinforcement. Strain hardening of the tension reinforcement increased the static resistance above the yield value the increase ranged from 5 to 60 percent. Although decreasing the amount of tension reinforcement increased the deflection of certain stages, the ultimate rotation capacity was not significantly affected. In addition, the size of the transverse reinforcement had a negligible effect on the ultimate rotation capacity.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Structural Engineering and Building Technology
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE