Title:
Damage Model for Reinforced Concrete Elements under Cyclic Loading
Author(s):
P. Srinivasa Rao, B. Sivarama Sarma, N. Lakshmanan, and F. Stangenberg
Publication:
Materials Journal
Volume:
95
Issue:
6
Appears on pages(s):
682-690
Keywords:
beams; cyclic loading; damage; ductility; earthquake resistant structures; reinforced concrete
DOI:
10.14359/411
Date:
11/1/1998
Abstract:
It is possible to quantify the extent of damage of reinforced concrete members under cyclic loading through a non-dimensional parameter known as ‘damage index.’ The damage index can be defined for the total structure as a global damage index or defined as a local damage index at the element level. In this paper the limitations in the existing local damage models are discussed. A new damage model is proposed consistent with accepted definitions of ductility and takes into account at least two equal amplitude cycles at each displacement level. A total of 23 reinforced concrete beam elements were tested under monotonic and cyclic loading up to the ultimate failure of the specimens. Based on the test results a simple relation also termed as modified Park’s model has been suggested for evaluation of damage index. The proposed model predicts 100 percent damage at the ultimate failure state of the element. The proposed method of damage model can be extended to other structural elements such as shear walls, columns, beam-column junctions, etc.