Scynot
Structural
- Aug 7, 2024
- 1
I'm Reviewing this paper (BEHAVIOR OF CYLINDER PILES DURING PILE INSTALLATION - Frank Rausche, M.ASCE1 and Scott Webster, M.ASCE2)on the causes of longitudinal cracking in piles and this paragraph stuck out for me.
"Poisson’s effect has occasionally been mentioned as a potential reason for
longitudinal cracking. However, hoop strain due to Poisson’s effect does not cause
stresses and, therefore, should not cause cracking. The authors have seen horizontal
strain measurement results that, as expected, ranged between 20% and 30% of
vertical compressive strain. Exactly, how the hoop reinforcement interacts with the
expanding concrete cylinder, particularly, since this cylinder is not uniform (grouted
tendon channels), could be part of an interesting study."
I'm having a hard time understanding this idea that transverse stress would be zero under vertical only load while transverse strain would be non-zero. how could you not expect any vertical cracking in the cylinder? any insight is appreciated.
"Poisson’s effect has occasionally been mentioned as a potential reason for
longitudinal cracking. However, hoop strain due to Poisson’s effect does not cause
stresses and, therefore, should not cause cracking. The authors have seen horizontal
strain measurement results that, as expected, ranged between 20% and 30% of
vertical compressive strain. Exactly, how the hoop reinforcement interacts with the
expanding concrete cylinder, particularly, since this cylinder is not uniform (grouted
tendon channels), could be part of an interesting study."
I'm having a hard time understanding this idea that transverse stress would be zero under vertical only load while transverse strain would be non-zero. how could you not expect any vertical cracking in the cylinder? any insight is appreciated.