Development Length of 0.6-Inch (15-mm) Diameter Prestressing Strand at 2-Inch (50-mm) Grid Spacing in Standard I-Shaped Pretensioned Concrete Beams

Details

• Creators:
  Burkett, William R. ; Kose, M. Metin
• Corporate Creators:
  Texas Tech University. Department of Engineering Technology
• Corporate Contributors:
  Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  0.6-inch Diameter Prestressing Strand Beams Bridges Bridge Superstructures Data Collection Debonded Strand Debonding Development Length High Strength Concrete Prestressed Concrete Pretensioning Transfer Length

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• Publication/ Report Number:
  TX /98/1388-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas ; United States
• Edition:
  TIU/C40 Project Summary, Sept 1995 - Aug 1998
• Corporate Publisher:
  Texas Tech University. Department of Engineering Technology
• Abstract:
  The research conducted at Texas Tech University (TTU) is an integral part of a larger, joint research project conducted with the University of Texas at Austin (UT) designed to provide additional test data for consideration toward lifting the FHWA moratorium. This joint project was to provide additional full scale test data on the transfer and development lengths of 0.6-inch (15-mm) diameter prestressing strand for two key variables, concrete strength and strand surface condition, for fully bonded and various combinations of bonded and debonded strand using AASHTO Type 1 (Texas Type A) I-beams. Three concrete strength ranges and two extreme strand surface conditions were used in the joint TTU/UT project to evaluate their effect on transfer and development lengths. Concrete strengths were 5,000-7,000 psi (34.4-48.2 MPa), 9,500-11,500 psi (65.4-79.2 MPa), and 13,000-15,000 psi (89.6-1 03.4 MPa) and strand surface conditions were mill bright or rusty. For each combination of concrete strength and strand surface condition, beams were tested for three other variations in the strand: all strands fully bonded, 50% of the strands debonded, and 60% or 75% of the strands debonded. TTU's portion of the project and the data reported herein is limited to concrete strength in the 5,000-7,000 psi (34.4-48.2 MPa) range and strand with a rusty surface condition for the each of the three strand variations listed above with a maximum debonded limit of 60%. Six beams and therefore 12 tests for both transfer and development lengths were conducted by TTU and reported herein. Transfer and development lengths that were experimentally determined during TTU's portion of this project are compared to current code requirements for both transfer and development lengths for ACI-318, AASHTO-Standard, and AASHTO-LRFD. In addition, these results are compared to two predictive equations for both transfer and development lengths: one that was proposed by C. Dale Buckner and one that was proposed by Susan N. Lane.
• Format:
  PDF
• Funding:
  0-1388
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:283b6f420b6a94250d86c08b8ebebcdf834dc94d86b2b6b114794785d94833fa94e61c5a70c0b5614dc5ac628bdab1cb0903538683a241c7243a60a8c04d71cc
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/86126/dot_86126_DS1.pdf
• File Type:
  [PDF - 2.00 MB ]