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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: 

SP197-02

Date: 

April 1, 2002

Author(s):

M. A. Sozen

Publication:

Symposium Papers

Volume:

197

Abstract:

To my friend and hero Professor $tikti Muvaffak flztimeri, a bouquet of thoughts and an invention of another hero, Professor Hardy Cross.

DOI:

10.14359/11926

Document: 

SP197-03

Date: 

April 1, 2002

Author(s):

M. P. Collins, E. C. Bentz, and Y. J. Kim

Publication:

Symposium Papers

Volume:

197

Abstract:

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.

DOI:

10.14359/11927

Document: 

SP197-10

Date: 

April 1, 2002

Author(s):

G. J. Parra-Montesinos and J. K. Wight

Publication:

Symposium Papers

Volume:

197

Abstract:

The behavior of beam-column connections in WC frame structures has been extensively studied since the 1960’s. These studies have served as the basis for design guidelines for WC joints, in which detailing requirements and stress limits are given to control damage and deterioration of strength and stiffness in the connections. However, no particular attention is paid to the deformation in the joint region and its relation to the connection strength. In this paper a model is presented to evaluate the shear strength of WC joints for various levels of joint shear distortion. The joint model is based on the state of plane strains in the connection through the development of a ratio between the joint principal strains, which was determined from experimental results. Based on the joint model, stress limits are proposed for interior and exterior joints for a shear distortion of 1%. These limits are similar to those recommended by ACI-ASCE Committee 352 for exterior connections. However, they are lower than those recommended for interior joints. The detrimental effect of eccentricity on joint strength is also estimated. Further analyses are required to fully quantify the effect of joint type and details on the principal strain ratio, and thus on joint strength.

DOI:

10.14359/11934

Document: 

SP197-11

Date: 

April 1, 2002

Author(s):

J. P. Moehle, K. J. Elwood, and H. Sezen

Publication:

Symposium Papers

Volume:

197

Abstract:

Earthquake reconnaissance has identified failure of reinforced concrete columnsas a primary cause of collapse of older existing reinforced concrete buildingframes during earthquakes. Apparent column failure, however, does not always result in building collapse. A study of columns tested in the laboratory examinesloss of lateral and vertical load capacities. Correlations with geometric, materials, and loading characteristics are identified.

DOI:

10.14359/11935

Document: 

SP197-12

Date: 

April 1, 2002

Author(s):

A. C. Heidebrecht and N. Naumoski

Publication:

Symposium Papers

Volume:

197

Abstract:

This paper describes an investigation into the seismic performance of a six storey moment resisting frame structure located in Vancouver and designed and detailed in accordance with the seismic provisions of the National Building Code of Canada (1995). Both pushover and dynamic analyses are conducted using an inelastic model of the structure as designed and detailed. The structural performance of frames designed with different ductility capacities is evaluated using interstorey drift and member curvature ductility response as performance measures. All frames studied are expected to perform at an operational level when subjected to design level seismic excitations and to meet life safe performance criteria at excitations of twice the design level.

DOI:

10.14359/11936

123

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