Application of Accelerated Bridge Construction Connections in Moderate-to-High Seismic Regions (2011) / Chapter Skim
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From page 4... ...
Definition of Seismic Connections and Performance Strategies The use of precast element technology for bridges in moderate-to-high seismic regions must consider the location and seismic resistance function of the bridge elements being connected. In the United States, bridges are designed for seismic resistance by permitting some inelastic deformation of the structure.
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From page 5... ...
This is an important distinction for the use of ABC techniques in seismic regions of the country. If a connection is made in a plastic hinging location, then the connection must be capable of sustaining inelastic deformations and dissipating kinetic energy input to the bridge system by an earthquake.
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From page 6... ...
Thus, the inelastic deformation is likely forced into the column. If the lower stage of the beam and the column are precast, and then connected by grouting bars into sleeves or ducts within the lower stage, the connection between the two stages of cap beam occurs in a beam-column joint region, which must be designed as capacity protected.
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From page 7... ...
Classification of Connection Types The information materials provided in the questionnaire responses and obtained from other sources were screened for details of connection intended to transfer seismic forces between bridge members. These details were classified in terms of their location within the bridge structure, their force transfer mechanism, seismic performance, and method of installation.
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From page 8... ...
• Hybrid Connections are connections that contain unbonded post-tensioning through the joint, which remains elastic and renders the connection self-centering under lateral cyclic loading. The hybrid connections also contain bonded bar reinforcement that is either spliced by bar couplers or anchored in grouted ducts.
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• Performance Potential -- the potential merits and disadvantages in terms of performance. • Time Savings Potential -- the potential for accelerating the construction schedule.
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Definition of technology readiness level for seismic accelerated bridge construction (SABC)
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Technology Readiness Level (TRL) % of Development Complete 001-5757-0505-5252-0noitpircseDLRT stsixetpecnoC1 2 Static strength predictable 3 Low seismic deployment 4 Analyzed for seismic loading 5 Seismic testing of components 6 Seismic testing of subassemblies 7 Design and construction guidelines 8 Deployment in high seismic area 9 Adequate performance in earthquake Time Savings Potential Definition Relative to CIP Value +2 Much better +1 Slightly better 0 lauqE -1 Slightly worse -2 Much worse Table 5.
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From page 12... ...
• Are bars spliced outside the plastic hinge zone? 12 Performance Potential Definition Relative to CIP Construction Risk Value Seismic Performance Value Durability Value Inspectability Value +2 Much better +1 Slightly better 0 Equal -1 Slightly worse -2 Much worse Table 6.
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From page 13... ...
There is a high likelihood that a connection will meet the required quality standard, but there is a minimal risk for not meeting installation cost or schedule. –1 Slightly Worse Detailing is somewhat complex, but skilled construction workers can execute the construction.
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From page 14... ...
The seismic performance and efficacy of such elements or systems can be inferred through a building-block approach. Conceivably, different connection types could be used within a single bridge and the overall seismic performance could be made to conform to the objectives of the AASHTO design specifications.
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