Skip to content

ConcreteTsai

Uniaxial Concrete Model Using Tsai's Equation

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

Syntax

Text Only
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
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, strain at compression strength, default: -2E-3
# [9] double, strain at tension strength, default: 1E-4
# [10] double, middle point, default: 0.2
# [11] double, density, default: 0.0
Text Only
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
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, strain at compression strength sign insensitive, default: -2E-3
# [7] double, strain at tension strength sign insensitive, default: 1E-4
# [8] double, middle point, default: 0.2
# [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

Text Only
1
2
3
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

Text Only
1
2
3
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