A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Upgrading Bridge Outrigger Knee Joint Systems
A part of the joint Caltrans and University of California at Berkeley research project focused on the outrigger knee joint systems found in bents of elevated freeway bridges. Experiments on two half-scale as-built models confirmed the poor performance of existing outrigger knee joint systems observed after the 1989 Loma Prieta earthquake. Two seismic upgrading strategies, a 'ductile' and a 'strong' strategy, were proposed and tested on prototype specimens. The 'strong' strategy was chosen for the final seismic upgrade design. Two variations of the final design, one made using a post-tensioned reinforced concrete jacket, the other made using a steel jacket, were tested on three specimens. The seismic design guidelines, recommending the steel jacket upgrade, contain three parts: an upgrade design procedure based on capacity design principles; and energy balanced hysteresis model for dynamic analysis and tools for predicting or verifying the performance of the upgraded outrigger knee joints, developed in parallel with the experiments; and recommendations for detailing the steel jacket upgrade and a design example.
Upgrading Bridge Outrigger Knee Joint Systems
A part of the joint Caltrans and University of California at Berkeley research project focused on the outrigger knee joint systems found in bents of elevated freeway bridges. Experiments on two half-scale as-built models confirmed the poor performance of existing outrigger knee joint systems observed after the 1989 Loma Prieta earthquake. Two seismic upgrading strategies, a 'ductile' and a 'strong' strategy, were proposed and tested on prototype specimens. The 'strong' strategy was chosen for the final seismic upgrade design. Two variations of the final design, one made using a post-tensioned reinforced concrete jacket, the other made using a steel jacket, were tested on three specimens. The seismic design guidelines, recommending the steel jacket upgrade, contain three parts: an upgrade design procedure based on capacity design principles; and energy balanced hysteresis model for dynamic analysis and tools for predicting or verifying the performance of the upgraded outrigger knee joints, developed in parallel with the experiments; and recommendations for detailing the steel jacket upgrade and a design example.
Upgrading Bridge Outrigger Knee Joint Systems
B. Stojadinovic (author) / C. R. Thewalt (author)
1995
174 pages
Report
No indication
English
Behavior of Bridge Outrigger Knee Joint Systems
| Online Contents | 1995
Seismic Upgrading of Outrigger Knee Joints
| British Library Conference Proceedings | 1995
Evaluation and Upgrading of Outrigger Knee Joints
| British Library Conference Proceedings | 1996
Seismic Retrofitting of Outrigger Knee Joints
| British Library Online Contents | 2005