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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 13 Abstracts search results
Document:
SP197-09
Date:
April 1, 2002
Author(s):
D. Mitchell
Publication:
Symposium Papers
Volume:
197
Abstract:
The approach for seismic evaluation and guidelines for seismic retrofit in the Canadian Highway Bridge Design code are presented. A number of common seismic deficiencies found in bridge structures are discussed. The reversed cyclic loading behavior of columns with lap splices at their bases, outrigger beam-column connections and columns with hinges at their bases are discussed. Methods suitable for retrofit of a number these deficiencies are described. The responses of these elements after these retrofit strategies had been carried out are also presented.
DOI:
10.14359/11933
SP197-06
A. Wyllie, Jr.
Many buildings built in the 19.50s and 1960s in regions of high seismicity are extremely vulnerable to extreme damage or collapse in future earthquakes. The most vulnerable and hazardous of these buildings are the unreinforced masonry buildings, with non-ductile concrete frame buildings considered the next most hazardous class. Concrete is a logical choice to strengthen these buildings, either with new shear walls or infilled walls or sometimes with jacketing. The most common and probably the best system is to add new reinforced concrete shear walls. It makes a building much more rigid, reduces seismic drifts or deformations and thus reduces damage and prevents the potential of collapse. A variation of adding shear walls is adding infilled walls, which are wall panels of reinforced concrete (or sometimes masonry) added between floor beams and columns. Concrete jackets consisting of a layer of concrete, usually about 4 inches (100 mm) thick, containing closely spaced ties, can also provide confinement and add shear capacity to concrete frame members. This paper will summarize the pros and cons of the application of these three seismic strengthening techniques.
10.14359/11930
SP197-08
S. A. Sheikh
Professor S. M. Uzumeri and the author initiated a research program on the seismic resistance of reinforced concrete columns in mid seventies. The first phase of this work concentrated on the behavior of rectilinearly confined concrete columns under axial compression. In addition to carrying out an extensive experimental program, an analytical model for the mechanism of concrete confinement by rectilinear transverse reinforcement was developed. This was followed by an investigation of square columns under combined axial load and flexure. After identifying the important variables that affected the mechanism of confinement and section behavior, the research advanced to a study of column behavior under simulated earthquake loads. Distribution of longitudinal and lateral reinforcement, level of axial load, spacing of ties and the type of lateral support provided to the longitudinal bars were found to significantly affect the ductile performance of a column. Based on the results from extensive experimental and analytical research, a design procedure was developed in which the amount of tie reinforcement and the detailing of both longitudinal and lateral reinforcement are determined for a required ductile performance of a column subjected to a given axial load. This paper presents selected results from the work carried out over the last several years. An example demonstrating the application of the design procedure is also included.
10.14359/11932
SP197-02
M. A. Sozen
To my friend and hero Professor $tikti Muvaffak flztimeri, a bouquet of thoughts and an invention of another hero, Professor Hardy Cross.
10.14359/11926
SP197
Editors: Shamim A. Sheikh and Oguzhan Bayrak / Sponsored by: Joint ACI-ASCE Committee 352 and ACI Committee 374 and Joint ACI-ASCE Committee 441
Papers on behavior and design of concrete structures presented at this symposium include: “Recently Identified Aspects of Ductile Seismic Torsional Response of Reinforced Concrete Buildings,” “Shear Strength of Circular Reinforced Concrete Columns,” “Remembering the Column Analogy, New Seismic Design Provisions in Japan,” “Lessons from Recent Earthquakes in Turkey and Seismic Rehabilitation of Buildings,” “Strengthening Buildings for Earthquake Resistance with New Concrete,” “A Link Between Research and Practice: ACI 352 Recommendations for Design of Joints in RC Structures,” “Design of Confining Reinforcement in Columns for Seismic Performance,” “Aspects of Seismic Evaluation and Retrofit of Canadian Bridges,” and “Prediction of Strength and Shear Distortion.” 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. SP197
10.14359/14014
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