CONCRETE DAMAGED

PLASTICITY MODELGEOSYSTEMS LABORATORY

DEPARTMENT OF CIVIL ENGINEERINGPUSAN NATIONAL UNIVERSITY

BUSAN, SOUTH KOREA

1

OUTLINE:

I. INTRODUCTIONII. ANALYSISIII. FINITE ELEMENT MODEL AND PARAMETERSIV. EXPECTED RESULTS/OUTPUT

2

CONCRETE DAMAGED PLASTICITY MODEL

ABAQUS is a general purpose simulation tool based on the finite element method that can be used for a variety of applications ranging from the modelling of civil engineering structures to acoustics.The concrete damaged plasticity model in ABAQUS: provides a general capability for modelling concrete and other

quasi-brittle materials in all types of structures; uses concepts of isotropic damaged elasticity in combination

with isotropic tensile and compressive plasticity to represent the inelastic behaviour of concrete;

is designed for applications in which concrete is subjected to monotonic, cyclic, and/or dynamic loading under low confining pressures; and

assumes that the two main failure mechanisms are tensile cracking and compressive crushing

I. INTRODUCTION

3

CONCRETE DAMAGED PLASTICITY MODEL

I. INTRODUCTION

Fig.1 – Tension Stiffening Model Fig.2 – Compressive Stress-Strain Relationship

Response of concrete to uniaxial loading in tension and compression

4

CONCRETE DAMAGED PLASTICITY MODEL

II. ANALYSISThere are two options by which the material

properties can be incorporated for the analysis in ABAQUS: a) through CAE and b) through input file.

Fig.3 – Material Editor (used to define material properties)5

CONCRETE DAMAGED PLASTICITY MODEL

III. FINITE ELEMENT MODEL AND PARAMETERS

Fig.4 – Finite element model (a) compression test, and (b) tension test

(a) (b) 6

C3D8R CAX4R

CONCRETE DAMAGED PLASTICITY MODEL

III. FINITE ELEMENT MODEL AND PARAMETERS

Table 1 – Model Parameters for CDP Model

Compression Yield

Inelastic Strain Tensile Yield Fracture En-

ergy

1100 kPa 0 380 kPa 9 N/m

1650 kPa 0.0015    

1650 kPa 0.0032    

1400 kPa 0.0053    

ELASTIC OPTION

Young’s Modulus, E (2400 Mpa)Poisson’s Ratio, v (0.167)

Source: Saw A, Leung C, and Tan S, “Evaluation of Constitutive Model in Simulating the Behavior of Cement-Treated Soil”, Third International Conference on Geotechnique, Construction Materials

and Environment, Nagoya, Japan, 2013.

7

CONCRETE DAMAGED PLASTICITY MODEL

IV. EXPECTED RESULTS/OUTPUT

Fig.5 – Contour plots of stress component S22 (a) undeformed shape, and (b) deformed shape (Compression test)

(a) (b) 8

CONCRETE DAMAGED PLASTICITY MODEL

IV. EXPECTED RESULTS/OUTPUT

Fig.6 – Contour plots of stress component S22 (both shapes) and field output requests (Compression test)

9

CONCRETE DAMAGED PLASTICITY MODEL

IV. EXPECTED RESULTS/OUTPUT

Fig.7 – Contour plots of von Mises (a) undeformed shape, and (b) deformed shape (Tension test)

(a) (b) 10

CONCRETE DAMAGED PLASTICITY MODEL

IV. EXPECTED RESULTS/OUTPUT

Fig.8 – Contour plots of von Mises (both shapes) and field output requests (Compression test)

11

CONCRETE DAMAGED PLASTICITY MODEL

IV. EXPECTED RESULTS/OUTPUT

Fig.9 – Stress-strain curves under (a) compression load, and (b) tension load

(a) (b)

12

THANK YOU!

13