Research Article

A Stress-Strain Model for Unconfined Concrete in Compression considering the Size Effect

Table 2

Summary of stress-strain models considering the size effect.

ResearcherStress-strain relationship of concrete

Markeset and Hillerborg [6]Ascending branch
Descending branch



Samani and Attard [7]Ascending branch
;
Descending branch
;




for crushed aggregates, and 3.78 for gravel aggregates.

This study

Ascending branch
Descending branch

, , , and are in MPa; , and are in mm; is in N/mm; is in kg/m3.