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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
Date:
April 1, 2002
Author(s):
Editors: Shamim A. Sheikh and Oguzhan Bayrak / Sponsored by: Joint ACI-ASCE Committee 352 and ACI Committee 374 and Joint ACI-ASCE Committee 441
Publication:
Symposium Papers
Volume:
197
Abstract:
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
DOI:
10.14359/14014
SP197-03
M. P. Collins, E. C. Bentz, and Y. J. Kim
Considering the very large number of circular concrete columns used to support buildings and bridges and the critical importance of ensuring that the shear strength of these members is sufficient to survive a possible earthquake, relatively few studies have been conducted on the shear strength of circular reinforced concrete columns. This paper summarizes the results of three experimental investigations in which a total of I.5 large circular specimens were tested in shear. The paper also explains how analytical models based on the modified compression field theory can be used to predict the shear response of circular reinforced concrete columns.
10.14359/11927
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
SP197-01
T. Paulay
With few exceptions, code provisions relevant to torsional phenomena in buildings subjected to seismic effects, are based on elastic structural behaviour. The key parameter is stiffness eccentricity. The appropriateness of this approach to the design of systems expected to respond in a ductile manner is questioned. The degree ofrestraint with respect to system twist, strength eccentricity and the pattern of element yield displacements are considered to be more important parameters. For the purposes ofseismic design, bi-linear force-displacement approximations of the elasto-plastic behaviour of reinforced concrete systems and their constituent elements, are considered to be adequate. Strategies aiming at the elimination of undesirable effects of torsional phenomena in ductile systems are addressed. The findings of this study are based on a re-definition of some common terms of structural engineering, such stiffness, yield displacement and displacement ductility relationships. Contradictions withcorresponding terms applicable to elastic systems are demonstrated. The introduction ofthese features, relevant to bilinear modelling of reinforced concrete elements, precedes the examination of the designer’s options for the control of earthquake-induced displacement demands resulting in system translations and twist.
10.14359/11925
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
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