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研究生：	楊家辰 Cordova, Alvaro
論文名稱：	多層混凝土磚石建築扭轉行為的數值分析 Numerical Simulations on the Torsional Behavior of Multistory Concrete Masonry Buildings
指導教授：	胡宣德 Hu, Hsuan-Teh
學位類別：	碩士 Master
系所名稱：	工學院 - 土木工程學系 Department of Civil Engineering
論文出版年：	2017
畢業學年度：	105
語文別：	英文
論文頁數：	163
外文關鍵詞：	Concrete masonry, macro-modeling, nonlinear static analysis, concrete damaged plasticity, capacity curve, torsional capacity, performance point
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The use of concrete masonry constructions in developing countries has become very frequent, especially for domestic purpose. Most of them with asymmetric wall configurations in plan resulting in significant torsional actions when subjected to seismic loads. The study consisted on the finding of a material model for hollow unreinforced concrete masonry and a validation with experimental data found in literature. Numerical simulations were performed to 20 buildings with variations in wall distributions and heights. Results were analyzed by inspection and with a non-linear static method. The findings revealed that eccentricities as well as structure rigidities have a strong influence on the overall response of concrete masonry buildings. In addition, slab rotations depicted more accurate information about the torsional behavior than maximum versus average displacement ratios. The failure modes in low buildings were characterized by high tensile strains in the first floor. Whereas in tall buildings these strains were lowered significantly by higher compression stresses due to a higher self-weight. These tall buildings developed multiple plastic hinges along the height. Finally, the non-linear static analysis exposed a brittle response for all masonry assemblies. This type of behavior is undesired in any construction and the need for a material model for reinforced masonry is pointed out.

Table of contents
ABSTRACT	ii
ACKNOWLEDGEMENTS	iii
CHAPTER 1	1
INTRODUCTION	1
CHAPTER 2	3
LITERATURE REVIEW	3
2.1	Masonry	3
2.1.1	Concrete masonry units	3
2.1.1.1 Manufacture	3
2.1.1.2 Concrete brick	5
2.1.1.3 Hollow loadbearing concrete masonry units	6
2.1.1.4 Moisture content for concrete brick and hollow masonry units	7
2.1.1.5 Compressive strength	9
2.1.1.6 Tensile strength	10
2.1.1.7 Creep	11
2.1.2 Mortar	11
2.1.2.1 Mortar types	12
2.1.2.2 Plastic mortar properties	14
2.1.2.3 Properties of hardened mortar	15
2.1.3 Grout and steel	19
2.1.4 Masonry building systems	22
2.2 Numerical simulations on masonry	27
2.2.1 Previous research	27
2.2.2 Modeling of masonry	28
2.2.3 Macro-modeling of masonry	30
2.2.3.1 Concrete damaged plasticity	31
2.2.3.1.1 Uniaxial tension and compression stress behavior	31
2.2.3.1.2 Biaxial yield criterion	33
2.2.3.2 Concrete smeared cracking	35
2.2.3.2.1 Cracking	35
2.2.3.2.2 Tension stiffening	36
2.2.3.2.3 Uniaxial and biaxial behavior	37
2.3 Nonlinear static analysis	38
2.3.1 Performance objectives and seismic hazards	39
2.3.2 Building performance levels	41
2.3.3 Coefficient method	42
2.3.4 Capacity spectrum method	46
2.4 Torsion	54
CHAPTER 3	56
METHODS	56
CHAPTER 4	77
RESULTS AND DISCUSSION	77
4.1 Results	77
4.2 Discussion	93
CHAPTER 5	97
CONCLUSIONS	97
CHAPTER 6	99
LIMITATIONS AND SUGGESTIONS FOR FUTURE RESEARCH	99
REFERENCES	100
APPENDIX A:	102
DEFORMED FEM MODELS AND PLASTIC STRAINS	102
APPENDIX B:	116
INPUT FILES	116
Compression test simulation	116
Pre-compression and lateral load test simulation	122
One story building type A	134
Eight story building type E	149

                                    

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