Category: Completed Projects
Group: Seismic
Subject: Piers
State: District of Columbia Abstract:
Key Words:
Specific ABC aspect:
Budget (USD): 0.00
Project length: 0
Project Starting Year: 2011
Project Completion Year: 2011
View TNW2011-17_Seismic_Behavior_and_Design_of_Segmental_Precast_Post-Tensioned.pdf
Go to: https://ntl.bts.gov/lib/46000/46200/46256/TNW2011-17_Seismic_Behavior_and_Design_of_Segmental_Precast_Post-Tensioned.pdf
Group: Seismic
Subject: Piers
State: District of Columbia 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 twospecimens 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. Includingdynamic loading in the model is essential to quantify the energy dissipation due to rocking of the columns segments. The outputof 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 energydissipater 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 initialconstruction 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.
Key Words:
Key words: concrete, CFFT, seismic, smart infrastructure
Specific ABC aspect:
Budget and Timeline
Budget (USD): 0.00
Project length: 0
Project Starting Year: 2011
Project Completion Year: 2011
Primary Sponsor
United States Department of Transportation
Office of the Secretary of Transportation
1200 New Jersey Ave, SE
Washington, DC 20590 USA
Primary Performing Organization
Transportation Northwest Regional Center X (TransNow)
Box 352700, 112 More Hall
University of Washington
Seattle, WA 98195-2700 USA
PI: Mohamed ElGawady
Assistant Professor
Co-PI: William Cofer
Professor
Other Documents
View TNW2011-17_Seismic_Behavior_and_Design_of_Segmental_Precast_Post-Tensioned.pdf
Other Related URLs
Go to: https://ntl.bts.gov/lib/46000/46200/46256/TNW2011-17_Seismic_Behavior_and_Design_of_Segmental_Precast_Post-Tensioned.pdf
