臺灣博碩士論文加值系統

Low-rise reinforced concrete (RC) street houses are very common to be seen in Taiwan. Most of them were built typically with the same configuration of structure plans. As the time goes by, many of those street houses are facing corrosion problem. The corrosion initiates due to the chloride contaminated material used to build those street houses. The street houses have already contained chloride iron content right after the completion of construction. This corrosion problem will lead confusion to engineers to determine the seismic capacity of these street houses, whether or not the street houses are still safe enough, or they should be retrofitted or even demolished. One of the methods to check the seismic performance of corroded RC street houses is by doing seismic evaluation. However, many engineers find it difficult to do seismic evaluation with corrosion consideration.
In this research, these two major problems were tried to be solved by applying corrosion effect into USFM (Uniaxial Shear-Flexure Model) approach and by producing a Plastic Hinge Generator program which can generate plastic hinge properties with corrosion consideration. The effect of corrosion was modeled by modifying the properties of steel rebar and cracked concrete.
A corroded low-rise RC street houses in Taichung, Taiwan was used to be a case study in this research. The evaluation method was implemented in ETABS Nonlinear version by performing pushover analysis for six cases of service time: 0 year, 10 years, 20 years, 30 years, 40 years, and 50 years. Pushover result showed that the strength reduction is only 13.65% until 50 years of service time. The displacement even increased until 20 years of service time. Otherwise, from 20 years to 50 years of service time, the displacement started to decrease. This unexpected behavior of ultimate displacement was because of the assumption of 20% drops from peak strength and the failure mode of RC members. Those reasons led to inaccuracy of ultimate displacement point determination. The observation of the collapse PGA over all cases of service time showed that the collapse PGAs are larger than the demand PGA in Taichung, Taiwan. It meant that the RC street houses are sufficient enough to sustain the seismic loading even until 50 years of service time. The reduction rate of collapse PGA for RC street houses in this case study is 1.14% - 2.14% per 10 years.

ABSTRACT i
ACKNOWLEDGEMENT ii
TABLE OF CONTENTS iii
LIST OF TABLES v
LIST OF FIGURES vi
CHAPTER 1 INTRODUCTION 1
1.1. BACKGROUND 1
1.2. STATEMENT OF PROBLEMS 2
1.3. OBJECTIVE AND SCOPE OF THE RESEARCH 4
1.4. OUTLINE 5
CHAPTER 2 LITERATURE REVIEW 6
2.1. LOW-RISE REINFORCED CONCRETE STREET HOUSES IN TAIWAN 6
2.2. TEASPA 7
2.3. CORROSION 24
2.4. ASFI APPROACH 28
2.5. MCFT APPROACH 31
2.6. USFM APPROACH 35
2.7. REINFORCEMENT SLIP DEFORMATION 38
2.8. PUSHOVER ANALYSIS 40
2.9. ETABS PLASTIC HINGE PROPERTIES 42
CHAPTER 3 ANALYTICAL MODEL 44
3.1. RESEARCH METHODOLOGY 44
3.2. MATERIAL CONSTITUTIVE LAWS 46
3.2.1. UNCONFINED CONCRETE 46
3.2.2. CONFINED CONCRETE 50
3.2.3. STEEL REBAR 54
3.3. REINFORCED CONCRETE MEMBER MODEL 57
3.3.1. BEAM AND COLUMN 57
3.3.2. WALL WITHOUT OPENING 58
3.3.3. WALL WITH OPENING 59
3.4. FLEXURE AND SHEAR MODEL 61
3.4.1. USFM ASSUMPTIONS WITH MODIFICATION 61
3.4.2. USFM ANALYTICAL STEPS WITH MODIFICATION 62
3.5. REINFORCEMENT SLIP MODEL 66
3.6. AXIAL MODEL 67
3.7. PLASTIC HINGE GENERATOR 69
3.7.1. MATLAB and C# 69
3.7.2. INPUT FORMAT 70
3.7.3. USER MANUAL INSTRUCTION OF THE PROGRAM 74
3.7.4. IDEALIZED PLASTIC HINGES 78
3.7.5. YIELD DISPLACEMENT EQUIVALENT 80
CHAPTER 4 CASE STUDY 83
4.1. BUILDING DATA 83
4.2. CASE DATA 88
4.2.1. TIME TO CORROSION INITIATION 88
4.2.2. CORROSION RATE 89
4.2.3. CORROSION LEVEL 89
4.3. STRUCTURAL MODELING 93
4.4. PUSHOVER ANALYSIS AND RESULT 97
4.5. COLLAPSE PGA 106
4.6. DISCUSSION 113
CHAPTER 5 CONCLUSION AND FUTURE RESEARCH 120
5.1. SUMMARY AND CONCLUSION 120
5.2. SUGGESTION & FUTURE RESEARCH 122
REFERENCES 123
APPENDICES 128

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