일부 증권 노동자의 우울 증상과 스트레스 및 노동 강도의 관련성

학위논문(석사) --서울대학교 대학원 :환경보건학과(산업보건전공),2008. 8.Maste

Development of Procedure Ship Collision Load Estimation Procedure based on Reliability Analysis

학위논문 (석사)-- 서울대학교 대학원 : 건설환경공학부, 2014. 2. 고현무.It is necessary to establish criteria deciding design loads from probability distribution of vessel collision load for bridge design based on load-resistance factor design method (LRFD) coping with ship-bridge collision. This study has adopted annual probability of exceedance for probability distribution of vessel collision load as criteria to decide design load. Reliability analysis method for estimating probability of failure is applied to define appropriate level of annual probability of exceedance. It has been decided the probability distribution of vessel collision load considering influence variables of collision conditions, and the probability distribution of structural resistance using P-M interaction diagram of critical section as a limit state and statistical property of resistance. When obtaining structural response from vessel collision load, time history analysis is conducted for considering dynamic effect of collision load. From this study, procedure of bridge reliability analysis for vessel collision load has been formalized. The results of numerical examples applying procedure of reliability analysis for vessel collision load could prescribe the reliability index depending on the annual probability of exceedance. Based on this study, dynamic effect due to vessel collision with bridge is required to be considered and from this procedure, it is possible to calculate more precise vessel collision load than the existing deterministic method.1 Introduction 1 1.1 Backgrounds 1 1.2 Research Objectives and Contents 5 2 Present Design Specification 8 2.1 Risk Analysis Method 11 2.2 Acceptance Criteria 15 3 Reliability Analysis for Vessel Collision Load 16 3.1 Formalization of Reliability Analysis Procedure for Vessel Collision Load 16 3.1.1 Probability Distribution of Vessel Collision Load 16 3.1.2 Reflection of Dynamic Effect Occurred by Ship Collision 21 3.1.3 Probability Distribution of Combined Load 23 3.2 Estimation Process of Reliability Index depending on design load 26 3.2.1 Assumptions 26 3.2.2 Selection of Annual Probability of Exceedance and Design Load 27 3.2.3 Section Design with Load Combination and Derivation of Probability Distribution of Resistance 28 4 Application of Numerical Examples 30 4.1 Prototype Design Bridge 30 4.1.1 Determination of Probability Distribution of Vessel Collision Load considering Dynamic Effect 31 4.1.2 Definition of Critical Section and Limit State Function 36 4.1.3 Determination of Probability Distribution of Combined Load 45 4.1.4 Calculation of Reliability Index depending on Design Load 45 4.2 Incheon Bridge 46 4.2.1 Determination of Probability Distribution of Vessel Collision Load considering Dynamic Effect 47 4.2.2 Definition of Critical Section and Limit State Function 50 4.2.3 Determination of Probability Distribution of Combined Load 52 4.2.4 Calculation of Reliability Index depending on Design Load 53 5 Conclusion 55 6 References 57 7 ABSTRACT in Korean 59Maste