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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 박대효
- 발행연도
- 2014
- 저작권
- 한양대학교 논문은 저작권에 의해 보호받습니다.
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Reliability analysis of prestressed concrete structure exposed to fire is conducted by First Order Reliability Method(FORM) to evaluate structural reliability. The evaluation criteria is based on structural reliability and it is following a proposed temperature dependent limit state function. Korea Expressway Corporation standard PSC beams[1] are considered in this study to estimate reliability indices. Korean Bridge Design Specification (Limit State Design, 2012)[2] is used as a design code in this study. Load and resistance parameters are considered as random variables and its statistical parameters are based on the available literature and paper. Dead load, live load and impact load are considered as a load model. Moment capacity is considered as a resistance model and it is function of fire temperature. Heat transfer analysis is performed by ANSYS(2007)[3] solver to determine how internal temperature changes in the section as a function of time. The hydrocarbon fire curve proposed by Eurocode(2004)[4] is subjected to standard PSC beams for 120minutes. The temperature gradient from the finite element heat transfer analysis is applied to the resistance model. The reliability indices from the fire decrease as fire sustainment time goes and it is mainly affected by reduction of material strength.
목차
TABLE OF CONTENTSTABLE OF CONTENS…....……………………......…....ⅰABSTRACT………………………………………….........ⅱLIST OF FIGURES……………………………………....ⅲLIST OF TABLES…...…………………………….…......ⅳCHAPTER 1 INTRODUCTION………..................……...11.1 GENERAL…………………………………………….......11.2 RESEARCH OBJECTIVES AND SCOPE….………...……...3CHAPTER 2 BACKGROUND………..................……......42.1 HEAT TRANSFER THEORY…………………………........42.1.1 Heat Conduction………………………………………..42.1.2 Heat Convection…………………………………….......52.1.3 Heat Radiation………………………………………….52.1.4 Heat Transfer Equations …………………………………..62.2 RELIABILITY THEORY.....................................................102.2.1 Basic Concept.................................................................102.2.2 Random Variables............................................................112.2.3 Limit State Function.........................................................142.2.4 Reliability Index..............................................................15CHAPTER 3 HEAT TRANSFER ANALYSIS………....213.1 THERMAL PROPERTIES OF CONCRETE..........................213.1.1 Density of Concrete..........................................................213.1.2 Specific Heat of Concrete...................................................223.1.3 Thermal Conductivity of Concrete.........................................233.1.4 Thermal Elongation of Concrete...........................................243.2 THERMAL PROPERTIES OF STEEL..................................263.2.1 Density of Steel..............................................................263.2.2 Specific Heat of Steel.......................................................273.2.3 Thermal Conductivity of Steel.............................................283.2.4 Thermal Elongation of Steel................................................283.3 FINITE ELEMENT ANALYSIS MODEL..............................303.3.1 Geometry Modeling..........................................................323.3.2 Mesh and Element Type.....................................................333.3.3 Boundary Conditions and Thermal Load.................................363.3.4 Result of Heat Transfer Analysis..........................................38CHAPTER 4 RELIABILITY ANALYSIS.......................464.1 LIMIT STATES..................................................................464.1.1 Limit State Function.........................................................464.2 LOAD MODEL..................................................................474.2.1 Types of Load................................................................474.2.2 Dead Load....................................................................474.2.3 Live Load with Impact Load...............................................494.3 RESISTANCE MODEL.......................................................524.3.1 Parameters of Resistance....................................................524.3.2 Statistic Parameters of Resistance.........................................554.4 RESULTS OF RELIABILITY ANALYSIS............................564.4.1 Reliability Index Effected by Span Length...............................564.4.2 Reliability Index Effected by Concrete Cover...........................57CHAPTER 5 SUMMARY and CONCLUSION..............61REFERENCES....................................................................63ACKNOWLEDGEMENT..................................................67
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