Structural assessment of "d" regions affected by premature concrete deterioration : technical report.

Details

• Creators:
  John B. Mander ; Bracci, Joseph M. ; Hurlebaus, Stefan ; Grasley, Zachary ; Karthik, Madhu M. ; Liu, Shih-Hsiang ; Scott, Reece M.
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bents
  • Bridge piers
  • Concrete bridges
  • Deterioration
  • D cracking
  • Failure analysis
  • Structural analysis
  • Reinforced concrete
  • Strut and tie method
  • Alkali silica reactions Concrete bridges--Cracking
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• Publication/ Report Number:
  FHWA/TX-12/0-5997-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas Department of Transportation. Research and Technology Implementation Office
• Abstract:
  The effects of ASR/DEF on the D-regions of structures are investigated by means of a dual experimental and ; analytical modeling program. Four near full scale specimens that represent cantilever and straddle pier bents, ; that are representative of typical bridges in Texas, are constructed, conditioned over time, and tested to failure. ; The undamaged first specimen serves as the control specimen, while the next two are tested after eight months ; and two years of field conditioning through the Texas heat along with supplemental water aimed at promoting ; ASR/DEF. The fourth remains to be tested within the next three years. In the two specimens subjected to ; deterioration, early formation of ASR gel is observed, and with time load-induced cracks along with other ; additional cracks are observed. These additional cracks are a result of the continued formation of ASR gel, ; which causes the concrete to swell, and in turn puts the reinforcing steel into a state of active prestress. It is ; observed that the failure mechanism in all the specimens is a brittle shear failure through the beam-column ; joint. Specimens with ASR/DEF deterioration show greater stiffness and strength, and slightly greater ductility. ; A Compatibility Strut-and-Tie (C-STM) technique is developed as a suitable minimalist analysis technique to ; model the force-deformation behavior of reinforced concrete bridge piers with significant D-regions that may ; be deteriorated through ASR/DEF effects. The C-STM simulates the overall and the internal behavior of the ; structure very well. In spite of the disturbing appearances of the ASR/DEF damage arising from concrete ; swelling and cracking, the performance and strength of the specimens are not impaired. Damage that appears in ; the cover concrete region is offset by the mild level of confinement to the core concrete induced by the ; reinforcing steel.
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• Format:
  PDF
• Funding:
  Project 0-5997
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25480/dot_25480_DS1.pdf
• File Type:
  [PDF - 37.07 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:cd06f6a1cf9de03ec3f1c87591bbb3214e4f16df6425d6aaff233e3bb42ae40404b564577474a622f5ab076d880599c945afcf60a4e96089745e5dd75b08c5f6