Dhakal

Dhakal Degradation

References

1. 10.1061/(ASCE)0733-9445(2002)128:9(1139)

Syntax

material Dhakal (1) (2) (3) (4)
# (1) int, unique material tag
# (2) int, host material tag
# (3) double, yield strain
# (4) double, geometry parameter

Theory

The model is proposed for modelling buckling of reinforcement bars in concrete members.

The geometry parameter [4] is defined as

$$\sqrt{{\displaystyle \frac{f_y}{100\text{MPa}}}}{\displaystyle \frac{L}{D}}.$$

Since this parameter is calibrated according to dimensional constant $100\text{MPa}$, the whole analysis must then use the same unit system.

This is a common issue in lots of phenomenological models, which lack a clear implication of those ad-hoc parameters.

Example

material MPF 1 2E5 400 .01
material Dhakal 2 1 5E-3 50
materialTest1D 2 -4E-4 10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200 100