A Damage Indicator for Reinforced Concrete Frames


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Title: A Damage Indicator for Reinforced Concrete Frames

Author(s): S. Toussi, J.T.P. Yao, and W.F. Chen

Publication: Journal Proceedings

Volume: 81

Issue: 3

Appears on pages(s): 260-267

Keywords: Bauschinger effect; bond stress; damage; deformation; dynamic loads; earthquakes; frames; hysteresis, reinforced concrete.

Date: 5/1/1984

A new damage indicator is introduced for reinforced concrete structural frames subjected to earthquake excitations. It is desirable to define a new damage indicator because of the unique behavior of reinforced concrete structures during strong motion earthquakes. Although several damage indicators exist, it is felt that these parameters in their current forms cannot be used effectively to predict the damage state in an existing structure. The new damage index, called slope ratio, is related to the apparent features of the identified load-deflection relationships of two one-tenth scale and ten-story reinforced concrete structural frames which were subjected to repeated earthquake loads in the laboratory. Results of several seismic and cyclic load tests are reviewed to study whether or not the features of the new damage indicator are present in these data in the form of measured load-deflection relationships.