利用黏彈性模型探討混凝土梁之敲擊載重反應｜國立臺灣科技大學博碩士論文系統

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研究生：	陳秋萬 Darmawan - Saputra Tarana
論文名稱：	利用黏彈性模型探討混凝土梁之敲擊載重反應 STUDY ON IMPACT LOAD RESPONSE OF CONCRETE BEAM USING VISCOELASTIC MODEL
指導教授：	張大鵬 Ta-Peng Chang
口試委員:	黃兆龍 Chao-Lung Hwang 謝佑明 Yo-Ming Hsieh 邱進隆 Jin-Long Qiu 孫詠明 Yo-Ming Sun
學位類別：	碩士 Master
系所名稱：	工程學院 - 營建工程系 Department of Civil and Construction Engineering
論文出版年：	2015
畢業學年度：	103
語文別：	英文
論文頁數：	113
中文關鍵詞：	Viscoelastic material 、Dynamic response 、Impact load 、Numerical.
外文關鍵詞：	Viscoelastic material, Dynamic response, Impact load, Numerical.
相關次數：	點閱：133 下載：2
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The main goal of this study is to investigate the dynamic response of viscoelastic material due to impact load from free fall of steel ball, in which, the dynamic responses in the time and frequency domain from experimental program and numerical simulation using ABAQUS commercial software were conducted. Six mortar beam specimens of 1001001000 mm were casted for the test to obtain the acceleration. Experimental variables included two curing ages of 14 and 21 days for mortar and two different diameters of 40 and 50 mm for dropping steel balls.
The results of time domain response show that the damping values from logarithmic decrements of concrete specimens were varied from 0.026 to 0.044. The result of Fast Fourier Transform (FFT) with 40 mm diameter of steel ball test shows that maximum acceleration at age of 14 days is 1.44 m/s2 at first dominating frequency 1678.4 Hz and 3738.4 Hz for second dominating frequency. The dominating frequencies value is very important when there is a need to select proper accelerometer for further investigation. The age of beam influenced energy dissipation and strain energy of beam model. The result shows that from 14 days to 21 days, the loss factor of beam were reduced. The implementation of creep in ABAQUS with relaxation data was successfully performed in order to study about dynamic response of viscoelastic material. The loss factor and phase angle between stress and strain were obtained and listed.

Abstract	ii
Acknowledgements	iii
Table of Contents	iv
List of Tables	vii
List of Figures	viii
CHAPTER 1 Introduction	1
1.1 Problem Background	1
1.2 Thesis Objectives	2
1.3 Thesis Outline	3
CHAPTER 2 Literature Review	5
2.1 Introduction	5
2.2 Linear Viscoelasticity	5
2.2.1 Creep and Relaxation	6
2.2.2 Hereditary Approach	7
2.2.3 Harmonic excitation and complex modulus	9
2.2.4 Interpretation of the complex modulus	11
2.2.5 Hysteresis and energy dissipation	12
2.3 Viscoelastic models derived from differential equations	13
2.4 Time domain viscoelasticity in ABAQUS	14
2.5 Implementation of creep in ABAQUS with relaxation test data	16
CHAPTER 3 Experimental Program and Numerical Simulation	23
3.1 Introduction	23
3.2 Experimental Program	23
3.3 Numerical simulation	25
3.3.1 General	25
3.3.2 Geometry	27
3.3.3 Boundary conditions and constraints	29
3.3.4 Material models	30
3.3.5 Loads	30
CHAPTER 4 Results and Discussions	47
4.1 Experimental Result	47
4.2 Numerical Analysis	48
CHAPTER 5 Conclusions and Future Directions	69
5.1 Conclusions	69
5.2 Future Directions	70
References	71
Appendices	75
Appendix A. Definition and implementation of viscoelastic properties in the finite-element model on ABAQUS.	75
Appendix B. ABAQUS input file for material properties for concrete of beam.	77
Appendix C. The calculation of contact force due to dropping ball.	83
Appendix D. The calculation of contact time and load amplitude of impact ball based  on Hertz contact Theory (SI Unit).	85
Appendix E. Evaluation of viscoelastic material in ABAQUS (Prony series output).	89
Appendix F. Input file example in ABAQUS (40 mm diameter at age of 14 days).	91
Appendix G. Calculation of critical time increment using Mathcad program.	99
Appendix H. Calculation of mesh size using Mathcad program.	101

                                

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