A multiscale/multiphysics model for concrete:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
Hannover
Inst. für Kontinuumsmechanik, Gottfried-Wilhelm-Leibniz-Univ.
2014
|
| Schriftenreihe: | Leibniz-Universität Hannover, Institut für Kontinuumsmechanik
B ; 14,5 |
| Schlagworte: | |
| Online-Zugang: | Inhaltstext Inhaltsverzeichnis |
| Beschreibung: | X, 164 S. Ill., graph. Darst. |
| ISBN: | 9783941302136 |
Internformat
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| 245 | 1 | 0 | |a A multiscale/multiphysics model for concrete |c Tao Wu |
| 264 | 1 | |a Hannover |b Inst. für Kontinuumsmechanik, Gottfried-Wilhelm-Leibniz-Univ. |c 2014 | |
| 300 | |a X, 164 S. |b Ill., graph. Darst. | ||
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| 338 | |b nc |2 rdacarrier | ||
| 490 | 1 | |a Leibniz-Universität Hannover, Institut für Kontinuumsmechanik : B |v 14,5 | |
| 502 | |a Zugl.: Hannover, Univ., Diss., 2014 | ||
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Datensatz im Suchindex
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CONTENTS
1 INTRODUCTION 1
1.1 MOTIVATION 1
1.2 BACKGROUND AND STATE OF THE ART 2
1.3 STRUCTURE 3
2 CONTINUUM MECHANICS 7
2.1 KINEMATICS 7
2.1.1 DEFORMATION 8
2.1.2 STRAINS 9
2.2 STRESSES 10
2.3 BALANCE EQUATIONS 10
2.3.1 BALANCE OF MASS 10
2.3.2 BALANCE OF LINEAR AND ANGULAR MOMENTUM 11
2.3.3 BALANCE OF ENERGY 12
2.3.4 SECOND FUNDAMENTAL THEOREM OF THERMODYNAMICS 13
2.4 CONSTITUTIVE EQUATIONS OF BULK PHASE 14
2.4.1 CONTINUUM DAMAGE MODEL 14
2.4.2 VISCO-PLASTICITY 16
2.5 CONSTITUTIVE EQUATIONS OF INTERFACE PHASE 17
2.5.1 INTRODUCTION TO COHESIVE ZONE MODEL (CZM) 18
2.5.2 ADOPTED CZM IN THIS WORK 20
2.5.3 THERMAL CONDUCTION ACROSS THE INTERFACE 24
2.5.4 HUMIDITY DIFFUSION ACROSS THE INTERFACE 27
2.6 WEAK FORMS OF BALANCE EQUATIONS 28
2.6.1 WEAK FORM OF BALANCE OF LINEAR MOMENTUM 28
2.6.2 WEAK FORM OF BALANCE OF ENERGY 29
2.6.3 WEAK FORM OF BALANCE OF MASS 31
3 FUNDAMENTALS OF THE COMPUTATIONAL APPROACH 33
3.1 FINITE ELEMENTS 33
3.1.1 ISOPARAMETRIC CONCEPT 34
3.1.2 SOLUTION STRATEGIES 35
3.1.3 NUMERICAL INTEGRATION 37
3.1.4 COUPLING 38
3.2 DISCRETIZED WEAK FORMS OF BALANCE EQUATIONS OF BULK PHASE 38
VII
HTTP://D-NB.INFO/1062819861
VIII
3.2.1 MECHANICAL PROBLEM 38
3.2.2 THERMAL PROBLEM 42
3.2.3 DIFFUSION PROBLEM 43
3.3 DISCRETIZED WEAK FORMS OF BALANCE EQUATIONS OF INTERFACE PHASE 44
3.3.1 REVIEW OF NUMERICAL FRACTURE MECHANICS MODELS FOR CONCRETE . . 44
3.3.2 NUMERICAL IMPLEMENTATION OF CZM 45
3.3.3 THERMAL CONDUCTION ACROSS THE INTERFACE IN THE FEM 49
3.3.4 DIFFUSION ACROSS THE INTERFACE IN THE FEM 52
4 ALKALI-SILICA REACTION 55
4.1 CHEMICAL MECHANISM OF ASR 56
4.1.1 REVIEW OF THEORETICAL MODELS OF ASR 58
4.1.2 REVIEW OF NUMERICAL MODELS OF ASR 59
4.2 KINETICS OF ASR 62
4.2.1 CHEMICAL REACTION KINETICS 62
4.2.2 INFLUENCE OF TEMPERATURE ON CHEMICAL EXTENT 63
4.2.3 INFLUENCE OF RELATIVE HUMIDITY ON CHEMICAL EXTENT 63
4.2.4 FUNDAMENTALS AND ASSUMPTIONS 66
5 MULTISCALE REPRESENTATION OF CONCRETE 69
5.1 MESOSCALE OF CONCRETE 70
5.1.1 REPRESENTATION OF MESOSCALE 71
5.1.2 TAKE-AND-PLACE APPROACH 72
5.1.3 DISCRETIZATION TECHNIQUE 72
5.2 INTERFACIAL TRANSITION ZONE (ITZ) BETWEEN AGGREGATES AND HCP 74
5.2.1 ZERO-THICKNESS INTERFACE ELEMENT 75
5.2.2 NUMERICAL EXAMPLE OF UNIT CELL 76
5.3 MICROSCALE MODEL OF HARDENED CEMENT PASTE (HCP) 80
5.3.1 REPRESENTATION OF HARDENED CEMENT PASTE 81
5.3.2 CONSTITUTIVE EQUATIONS OF COMPONENTS IN HCP 82
5.3.3 SOLID PHASE 82
5.3.4 GEL IN MICROPORES OF HCP 82
5.3.5 ASR INDUCED DAMAGE IN HCP 83
6 COMPUTATIONAL HOMOGENIZATION OF ASR DAMAGE 85
6.1 INTRODUCTION 85
6.2 ANALYTICAL HOMOGENIZATION 86
6.3 COMPUTATIONAL HOMOGENIZATION 87
6.3.1 COMPUTATIONAL THERMAL HOMOGENIZATION 89
6.3.2 WINDOW METHOD 94
6.3.3 COMPUTATIONAL DIFFUSION HOMOGENIZATION 100
6.3.4 COMPUTATIONAL MECHANICAL HOMOGENIZATION 102
CONTENTS IX
7 COMPUTATIONAL SIMULATION OF EFFECTS OF THE ITZ 111
7.1 NUMERICAL RESULTS IN UNIAXIAL TENSION 112
7.1.1 DAMAGE DISTRIBUTION 113
7.1.2 INFLUENCE OF PARAMETERS IN CZM 114
7.1.3 INFLUENCE OF SPECIMEN SIZE 116
7.1.4 INFLUENCE OF RANDOM DISTRIBUTION OF AGGREGATES 118
7.1.5 DEBONDING INTERFACE DAMAGE 118
7.1.6 PARAMETER IDENTIFICATION 120
7.2 NUMERICAL RESULTS IN UNIAXIAL COMPRESSION 121
7.3 MECHANICAL-THERMAL-DIFFUSION COUPLING FOR THE ITZ 123
7.3.1 STAGGERED METHOD 123
7.3.2 NUMERICAL THERMAL RESULTS 125
7.3.3 NUMERICAL DIFFUSION RESULTS 125
8 MULTISCALE MULTIPHYSICS SIMULATION RESULTS 129
8.1 INTRODUCTION 129
8.2 NUMERICAL EXAMPLE 130
9 CONCLUSIONS AND OUTLOOK 135
A HOMOGENIZATION 139
A.L MECHANICAL HOMOGENIZATION 139
A.1.1 AVERAGE STRAIN THEOREM 139
A. 1.2 AVERAGE STRESS THEOREM 140
A.2 THERMAL HOMOGENIZATION 141
A.2.1 AVERAGE TEMPERATURE GRADIENT THEOREM 141
A.2.2 AVERAGE THERMAL FLUX THEOREM 141
A.3 DIFFUSION HOMOGENIZATION 142
A.3.1 AVERAGE HUMIDITY GRADIENT THEOREM 142
A.3.2 AVERAGE DIFFUSION FLUX THEOREM 143
BIBLIOGRAPHY 143
CURRICULUM VITAE 164 |
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| discipline | Werkstoffwissenschaften Bauingenieurwesen Werkstoffwissenschaften / Fertigungstechnik |
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| indexdate | 2024-08-03T02:26:29Z |
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| isbn | 9783941302136 |
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| series2 | Leibniz-Universität Hannover, Institut für Kontinuumsmechanik : B |
| spelling | Wu, Tao 1984- Verfasser (DE-588)1070635189 aut A multiscale/multiphysics model for concrete Tao Wu Hannover Inst. für Kontinuumsmechanik, Gottfried-Wilhelm-Leibniz-Univ. 2014 X, 164 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Leibniz-Universität Hannover, Institut für Kontinuumsmechanik : B 14,5 Zugl.: Hannover, Univ., Diss., 2014 (DE-588)4113937-9 Hochschulschrift gnd-content Leibniz-Universität Hannover, Institut für Kontinuumsmechanik B ; 14,5 (DE-604)BV036467379 B 14,5 X:MVB text/html http://deposit.dnb.de/cgi-bin/dokserv?id=4893730&prov=M&dok%5Fvar=1&dok%5Fext=htm Inhaltstext DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=028040709&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Wu, Tao 1984- A multiscale/multiphysics model for concrete Leibniz-Universität Hannover, Institut für Kontinuumsmechanik |
| subject_GND | (DE-588)4113937-9 |
| title | A multiscale/multiphysics model for concrete |
| title_auth | A multiscale/multiphysics model for concrete |
| title_exact_search | A multiscale/multiphysics model for concrete |
| title_full | A multiscale/multiphysics model for concrete Tao Wu |
| title_fullStr | A multiscale/multiphysics model for concrete Tao Wu |
| title_full_unstemmed | A multiscale/multiphysics model for concrete Tao Wu |
| title_short | A multiscale/multiphysics model for concrete |
| title_sort | a multiscale multiphysics model for concrete |
| topic_facet | Hochschulschrift |
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