Accession Number : AD0712832

Title :   STUDY OF PRESTRESSED COMPOSITE CONCRETE TEE BEAMS UNDER FLEXURAL LOADING.

Descriptive Note : Final rept.,

Corporate Author : NATIONAL BUREAU OF STANDARDS WASHINGTON D C

Personal Author(s) : Bryson,J. O. ; Carpenter,E. F.

Report Date : OCT 1969

Pagination or Media Count : 46

Abstract : Prestressed Tee-beams constructed by the split-beam method were tested to failure in flexure to study the behavior and ultimate strength of these beams and to compare their flexural characteristics with those of prestressed beams of conventional construction. The variables in the study included the percentage of prestressing steel, strength of concrete in the compressive element of the composite split-beams, manner of prestressing and web reinforcement. Results showed that no significant distinction can be drawn between the composite split-beams and monolithically constructed beams on the basis of flexural response and ultimate load. The flange portion of the cross-section of the split-beam is cast after the stem of the beam has been formed and prestressed. The strength of the concrete for the flange section, which is called the compressive element, can be reduced within limits from that required for the prestressed stem (tensile element) without sacrificing ultimate load capacity. The required percentage of reinforcing steel is less for the split-beam compared with conventional beams. (Author)

Descriptors :   (*BEAMS(STRUCTURAL), LOADS(FORCES)), (*REINFORCED CONCRETE, FLEXURAL STRENGTH), TEST METHODS, DEFORMATION, STRESSES, TENSILE PROPERTIES, CRACKS, CRACK PROPAGATION, FAILURE(MECHANICS)

Subject Categories : Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE