Seismic Behavior and Design of Segmental Precast Post-Tensioned Concrete Piers

Details

• Creators:
  Dawood, Haitham ; ElGawady, Mohamed ; Cofer, William
• Corporate Creators:
  Transportation Northwest Regional Center X (TransNow) (UTC)
• Corporate Contributors:
  United States. Department of Transportation. Office of the Secretary ; United States. Department of Transportation. University Transportation Centers (UTC) Program
• Subject/TRT Terms:
  • Earthquake resistant design
  • Earthquakes
  • Earthquake engineering
  • Earthquake resistant structures
  • Bridge piers
  • Posttensioning
  • Tensioning
  • Smart structures
  • Concrete Concrete
  • CFFT
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• Publication/ Report Number:
  TNW2011-17
• Resource Type:
  Tech Report
• Geographical Coverage:
  Washington
• Edition:
  Final technical report.
• Corporate Publisher:
  Transportation Northwest (TransNow) UTC
• Abstract:
  Segmental precast column construction is an economic environmental friendly solution to accelerate bridge construction in the United ; States. Also, concrete-filled fiber reinforced polymer tubes (CFFT) represents a potential economic solution for durability issues in ; bridge industry. Combining the segmental precast and CFFT will result in rapid durable construction system. The proposed research ; will build on recent work by the PI where he experimentally investigated the seismic behavior of tens single-column and two-column ; bents constructed using precast post-tensioned CFFT. The columns were constructed by stacking precast CFFT segments one on top of ; the other and then post-tensioned using unbonded tendons. Two specimens had external energy dissipation devices and another two ; specimens had neoprene in the joints between the CFFT segments. The neoprene significantly reduced the seismic displacement ; demand. The columns re-centered upon the conclusion of the test resulting in minimal residual displacement which represents, in the ; case of a real strong earthquake, a huge advantage since the post-earthquake repair measures will be minimal. A 3-D finite element ; models were developed by the PI to predict the performance of the single-column under monotonic lateral loads. The main objective of ; this proposal is to improve and expand the capabilities of these finite element models to produce design recommendations. In ; particular, the models will be expanded to include dynamic loading, two-column bents, and the neoprene in the joints. Including ; dynamic loading in the model is essential to quantify the energy dissipation due to rocking of the columns segments. The output of this ; research will be recommendations on the optimum construction characteristics of the system including the segment height/column ; diameter ratio, neoprene thickness and hardness, external energy dissipater requirements, and post-tensioning force level. The proposed ; research will develop a durable environmental friendly rapid construction bridge system, which has low life-cycle costs, construction ; waste, noise, traffic disruption, and initial construction cost. In addition, the developed system will has high work zone safety, efficient ; use of construction material, a short construction time, and improved constructability. The proposed construction system will not have ; a leakage of wet concrete into waterways leading to pollution of water and harm migrating fish. Finally, when the proposed ; construction system fully developed and implemented in construction, it will reduce the expense of bridge replacement, repair, and ; continuous operation interruption after earthquakes.
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• Format:
  PDF
• Funding:
  DTRT07-G-0010
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25127/dot_25127_DS1.pdf
• File Type:
  [PDF - 7.37 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:6ab3f092ea9d17e45246aa88c9414f9b811c023660a9d4b701de853f08736e4a267d664ec85a34d2251ef342411f4560e4611b03920eeeee853b9c44a411be53