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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 18 Abstracts search results
Document:
SP187
Date:
June 1, 1999
Author(s):
Editor: K. Krishnan / Sponsored by: ACI Committee 341
Publication:
Symposium Papers
Volume:
187
Abstract:
The 17 papers presented cover a wide array of subjects related to seismic behavior of concrete bridge structures. Topics include the impact of recent earthquakes on the seismic design process, results of recent experimental research on behavior of bridge components during earthquakes, case studies of bridge seismic upgrades, and the use of composite materials and seismic isolation systems to enhance seismic performance. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP187
DOI:
10.14359/14222
SP187-12
S. Pujol, J. A. Ramfrez, and M. A. Sozen
The current seismic design philosophy allows nonlinear behavior of the structure to reduce strength requirements. This implies that the structure must be able to retain its integrity under cycles of displacement into the nonlinear range. The structure has to be tough. Evaluation of experimental results from 15 series of tests reported by various investigators has shown that the limiting drift capacity of a reinforced concrete column proportioned to resist earthquake effects through energy dissipation in the nonlinear range of response may be determined simply by considering two parameters: 1) the aspect ratio, and 2) the transverse reinforcement index.
10.14359/5602
SP187-09
J. B. Mander and C.-T. Cheng
As low cycle fatigue failure in the longitudinal reinforcement is unavoidable, it necessitates the concept of using replaceable plastic hinges in which specially-detailed reinforcing fuse-bars are installed. Three one-third scale model pier specimens were constructed. The first renewable-hinge column was tested and repaired five times. The second pre-cast column was also constructed using the fuse-bar connections and subsequently repaired ten times. For comparative purposes, a conventionally reinforced column was constructed and tested. It was found that each of the repaired columns performed as well as the undamaged virgin columns. This new approach to construction enables rapid restoration to full service following a damaging earthquake.
10.14359/5599
SP187-07
Y. Xiao, M. J. N. Priestley, and F. Seible
In order to provide experimental background for current seismic design of bridge footings, a 0.4:1 scale circular-column footing model was tested. The model was designed and constructed based on a footing of an actual prototype bridge which was built following current bridge design standards. The model pier was tested in a vertical cantilever condition with cyclic horizontal displacements and constant axial load applied to the top of the column. The pier was supported on rubber pads simulating the compressive flexibility of pile foundation, with high tensile strength bars simulating the compressive flexibility of pile foundation, with high horizontal displacement, the pier developed a satisfactory hysteretic response with a full plastic hinge formed at the bottom of the column. However, test results and theoretical analyses revealed potential problems in current bridge footing design, in particular, the lack of the column/footing joint shear design as well as non-conservative flexural and shear designs which are based on full effectiveness of the entire footing width.
10.14359/5597
SP187-08
B. Stojadinovic´
A comprehensive research project focused on investigation and repairing the vulnerable elevated freeway bridge structures was initiated and jointly conducted by the California Department of Transportation and the University of California at Berkeley after the 1989 Loma Prieta earthquake. One part of this project was the investigation of outrigger knee joints, a structural sub-system found in elevated freeway bridges. This investigation had two principal goals: to evaluate the behavior of existing outrigger knee joint systems under a combined transverse seismic upgrading of existing outrigger knee joints. The focus of this paper is the design procedure for seismic upgrade of existing outrigger knee joint systems. This design procedure comprises a performance objective, quantified in terms of system drift demand, and a displacement-based capacity design process that centers around an interaction for computing the level of column plastic hinge confinement pressure. To further explore the upgrade design framework. Four damage indices are examined as candidates for the role of a response measures that relates a global performance objective to a local design parameter. Directions for new research derived from this exploration are discussed in the conclusion.
10.14359/5598
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