ALLOWABLE TENSILE STRESSES FOR PRESTRESSED CONCRETE
THE DESIGN OF A SATISFACTORY PRESTRESSED CONCRETE BEAM MUST BE SUCH THAT IT PROVIDES SUFFICIENT SAFETY FACTOR WITH SATISFACTORY BEHAVIOR UNDER SERVICE CONDITIONS. A SIMPLIFIED RATIONAL METHOD OF DETERMINING AN ALLOWABLE TENSILE STRESS, WITH A BI-LINEAR ASSUMPTION OF LOAD-DEFLECTION BEHAVIOR, IS PRESENTED. IT IS BASED ON THE POST-CRACKING BEHAVIOR OF BONDED PRESTRESSED CONCRETE BEAMS. THE PROPOSED EQUATION FOR ALLOWABLE TENSILE STRESS IS BASED ON AN ASSUMED BY-LINEAR CURVE FOR LOAD-DEFLECTION BEHAVIOR. THE FOLLOWING PARAMETERS WERE CONSIDERED TO DEVELOP THIS CURVE: THE SLOPE OF THE INITIAL AND FINAL PORTIONS OF THE CURVE, AND THE POINT OF CHANGE IN SLOPE. THE SLOPE OF THE FIRST PORTION OF THE CURVE IS DETERMINED BY THE MOMENT OF INERTIA OF THE GROSS CONCRETE SECTION. THE SLOPE OF THE SECOND PORTION IS DETERMINED BY THE MOMENT OF INERTIA OF THE CRACKED SECTION ANALYZED AS IN REINFORCED CONCRETE. THE POINT OF CHANGE IN SLOPE IS DETERMINED BY AN ASSIGNED CRACKING STRESS AND THE PRESTRESS CONDITIONS. THE CORRELATION BETWEEN THE PROPOSED METHOD AND TEST RESULTS WAS FOUND TO BE REASONABLY CLOSE.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/08879672
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Supplemental Notes:
- Vol 15, No 1, PP 37-42, 3 FIG, 2 TAB, 3 REF
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Authors:
- Goble, G G
- Edward, H H
- Hammersmith, R J
- Logan, D R
- Scott, N L
- Publication Date: 1970-2
Media Info
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Serial:
- PRECAST/PRESTRESSED CONCRETE INSTITUTE. JOURNAL
- Publisher: Precast/Prestressed Concrete Institute
- ISSN: 0887-9672
Subject/Index Terms
- TRT Terms: Beams; Deflection; Fracture mechanics; Loads; Mathematical analysis; Moments of inertia; Prestressed concrete; Prestressing; Safety factors; Tension
- Uncontrolled Terms: Tensile stress
- Old TRIS Terms: Moment of inertia
- Subject Areas: Bridges and other structures; Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00209315
- Record Type: Publication
- Files: TRIS
- Created Date: Sep 28 1970 12:00AM