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ConcreteTsai

Uniaxial Concrete Model Using Tsai's Equation

The ConcreteTsai model is a simple concrete model using Tsai's equation.

Syntax

Depending on the number of parameters provided (8 to 11), the model can be defined in two ways.

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material ConcreteTsai (1) (2) (3) (4) (5) (6) (7) [8] [9] [10] [11]
# (1) int, unique material tag
# (2) double, compression strength, should be negative but sign insensitive
# (3) double, tension strength, should be positive but sign insensitive
# (4) double, MC
# (5) double, NC
# (6) double, MT
# (7) double, NT
# (8) double, middle point, typical: 0.2
# (9) double, strain at compression strength, typical: -2E-3
# (10) double, strain at tension strength, typical: 1E-4
# [11] double, density, default: 0.0
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material ConcreteTsai (1) (2) (3) (4) (5) [6] [7] [8] [9]
# (1) int, unique material tag
# (2) double, compression strength, should be negative but sign insensitive
# (3) double, tension strength, should be positive but sign insensitive
# (4) double, M
# (5) double, N
# (6) double, middle point, typical: 0.2
# (7) double, strain at compression strength sign insensitive, typical: -2E-3
# (8) double, strain at tension strength sign insensitive, typical: 1E-4
# [9] double, density, default: 0.0

History Variable Layout

Since it is derived from the SimpleHysteresis model, they share the same history variable layout.

Remarks

  1. The middle point parameter represents the size of hysteresis loop, valid values range from 0 to 1 (ends not recommended).
  2. There is no additional consideration for small loops, which is available in ConcreteCM.

Usage

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material ConcreteTsai 1 30 20 2 2 2 2 .8 2E-3 2E-3
materialTest1D 1 1E-4 50 100 120 140 160 180
exit

example one

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material ConcreteTsai 1 30 20 2 2 2 2 .1 2E-3 2E-3
materialTest1D 1 1E-4 50 100 120 140 160 180
exit

example two