Drift and Damage Considerations in Earthquake-Resistant Design of Reinforced Concrete Buildings
Algan, Bekir Bulent
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https://hdl.handle.net/2142/69913
Description
Title
Drift and Damage Considerations in Earthquake-Resistant Design of Reinforced Concrete Buildings
Author(s)
Algan, Bekir Bulent
Issue Date
1982
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
The importance of considerations related to drift and damage in earthquake-resistant design of medium-rise reinforced concrete building structures is investigated in this study. Simple (linear) methods used to calculate estimates of actual drift can easily be communicated to engineers and architects responsible for design and detailing of a building.
The observed behavior of sixteen, ten and nine story (small-scale) test structures subjected to strong earthquake motions on the University of Illinois Earthquake Simulator is summarized based on their displacement response (drift) and their dynamic properties.
Approximately 700 racking tests on nonstructural partitions from more than 30 different sources are surveyed to evaluate thresholds for partition damage. A parametric study on drift capacity of ordinary reinforced concrete frame structures indicated that by the time the deformation capacities of a frame is exhausted, the nonstructural partitions attached directly to the structure would be lost almost completely.
Another measure of tolerable drift in the event of the "design earthquake" was obtained from a survey involving a select group of approximately 100 engineers in the U.S. and Japan.
A damage index is identified in terms of drift distribution. The index recognizes both "frame" and "wall" action in the evaluation of performance based on structural and nonstructural damage.
A review of existing earthquake-resistant design guidelines in regions with high seismic activity around the world revealed that considerations for drift and damage in design are not addressed adequately.
The rating method developed to evaluate performance of a building based on damage index was successful in estimating the observed performance of four reinforced concrete buildings that suffered various grades of damage during the past strong earthquakes.
It is concluded that drift ought to be the "pivot" in the earthquake-resistant design process.
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