Title:
Behavior of Concrete Under Dynamic Tensile Loads
Author(s):
Byung Hwan Oh
Publication:
Materials Journal
Volume:
84
Issue:
1
Appears on pages(s):
8-13
Keywords:
concretes; dynamic loads; dynamic structural analysis; microcracking; plain concrete; strains; stress-strain relationships; tensile strength; Materials Research
DOI:
10.14359/1787
Date:
1/1/1987
Abstract:
A realistic nonlinear stress-strain model that can describe the dynamic tensile behavior of concrete is presented. The model is obtained by generalizing rate-independent nonlinear tensile stress-strain relations for concrete. The static tensile behavior of concrete is modeled on the basis of the concept of microcrack planes. The inelastic phenomena such as microcracking occur predominantly on certain weak planes within the material. The orientations of these weak planes are considered to be uniformly distributed in the concrete. The model based on this concept describes well the static tensile test results of concrete. The affinity transformations are employed to model the effect of strain rate. The material parameters are characterized in terms of the strain-rate magnitude. The present theory, which can model the dynamic tensile behavior of concrete, is compared with the dynamic tensile test data available in the literature. An equation is proposed to predict the increase of tensile strength due to an increase of strain rate. It is found that the effect of strain rate is more sensitive in tension than in compression. The model describes adequately the dynamic tensile behavior of concrete and allows more realistic dynamic analysis of concrete structures.