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      Unified Code Calibration for Short- to Medium-span and Long-span Bridges with New Vehicular Live Load Model

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      https://www.riss.kr/link?id=T14817332

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      다국어 초록 (Multilingual Abstract)

      There are two bridge design codes in Korea adopting reliability-based load-and-resistance factor design for short- to medium-span and long-span bridges, respectively. Unified code calibration is required for the bridge design codes since their load-resistance factors were developed separately. Moreover, there is lack of consistency of theoretical backgrounds for a design vehicular live load and the statistical model of a vehicular live load effect. Therefore, the new statistical model of a vehicular live load effect and the corresponding design lane load are proposed based on the same data and the unified code calibration is conducted for the Ultimate Limit State I and V applying the current and new statistical models of the vehicular live load effect. The calibration is performed by adopting the optimization scheme for uniformly satisfying a target level of reliability. Load factors of the Ultimate Limit State I are defined depending on load compositions so the suggested load-resistance factors are applicable to design not only short- to medium-span but also long-span bridges. Furthermore, calibrations of the Ultimate Limit State V are conducted for short- to medium-span and long-span bridges, respectively. Reliability indices evaluated by proposed load-resistance factors more uniformly satisfy the target reliability index than those calculated by load-resistance factors in the current bridge design codes.
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      There are two bridge design codes in Korea adopting reliability-based load-and-resistance factor design for short- to medium-span and long-span bridges, respectively. Unified code calibration is required for the bridge design codes since their load-re...

      There are two bridge design codes in Korea adopting reliability-based load-and-resistance factor design for short- to medium-span and long-span bridges, respectively. Unified code calibration is required for the bridge design codes since their load-resistance factors were developed separately. Moreover, there is lack of consistency of theoretical backgrounds for a design vehicular live load and the statistical model of a vehicular live load effect. Therefore, the new statistical model of a vehicular live load effect and the corresponding design lane load are proposed based on the same data and the unified code calibration is conducted for the Ultimate Limit State I and V applying the current and new statistical models of the vehicular live load effect. The calibration is performed by adopting the optimization scheme for uniformly satisfying a target level of reliability. Load factors of the Ultimate Limit State I are defined depending on load compositions so the suggested load-resistance factors are applicable to design not only short- to medium-span but also long-span bridges. Furthermore, calibrations of the Ultimate Limit State V are conducted for short- to medium-span and long-span bridges, respectively. Reliability indices evaluated by proposed load-resistance factors more uniformly satisfy the target reliability index than those calculated by load-resistance factors in the current bridge design codes.

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      목차 (Table of Contents)

      • 1. INTRODUCTION 1
      • 1.1 Motivation 1
      • 1.2 Objectives and Scope 3
      • 1.3 Organization 4
      • 2. OPTIMIZATION SCHEME FOR CALIBRATION 5
      • 1. INTRODUCTION 1
      • 1.1 Motivation 1
      • 1.2 Objectives and Scope 3
      • 1.3 Organization 4
      • 2. OPTIMIZATION SCHEME FOR CALIBRATION 5
      • 2.1 Normalization of Limit State Functions 5
      • 2.1.1 Normalization of Ultimate Limit State I 7
      • 2.1.2 Normalization of Ultimate Limit State V 8
      • 2.2 Optimization for Calibration 9
      • 2.2.1 Object Function for Ultimate Limit State I 9
      • 2.2.2 Object Function for Ultimate Limit State V 10
      • 2.2.3 Calculation of Optimization Problem 10
      • 3. NEW VEHICULAR LIVE LOAD MODEL 15
      • 3.1 Statistical Model of Vehicular Live Load 15
      • 3.1.1 Simulated Data of Vehicular Live Load 15
      • 3.1.2 Definition of Vehicular Live Load 20
      • 3.1.3 Distribution Type of Vehicular Live Load 21
      • 3.1.4 Statistical Parameters of Vehicular Live Load 24
      • 3.2 Design Lane Load 25
      • 3.2.1 Reference Length 25
      • 3.2.2 Design Vehicular Live Load 26
      • 3.2.3 Proposed Design Lane Load 27
      • 3.3 Statistical Model of Vehicular Live Load Effect 29
      • 3.3.1 Formula of Vehicular Live Load Effect 29
      • 3.3.2 Distribution Type of Vehicular Live Load Effect 30
      • 3.3.3 Statistical Parameters of Vehicular Live Load Effect 33
      • 3.3.4 Comparison of Statistical Models of Vehicular Live Load Effect 35
      • 3.4 Multiple Presence Factor 36
      • 4. CALIBRATION OF ULTIMATE LIMIT STATE I 39
      • 4.1 Gravitational Loads-governed Limit State for KHBDCs 39
      • 4.2 Conditions for Calibration of Ultimate Limit State I 39
      • 4.2.1 Target Reliability Index, Resistances, and Load Effects for Ultimate Limit State I 39
      • 4.2.2 Ranges of DC-dead Load Ratio and Dead Load Ratio 41
      • 4.3 Determination of L-R Factors for Ultimate Limit State I 45
      • 4.3.1 Calibration Process of Ultimate Limit State I 45
      • 4.3.2 Proposed L-R Factors for Ultimate Limit State I 47
      • 4.3.3 Results of Reliability Analyses by Proposed L-R Factors of Ultimate Limit State I 51
      • 4.3.4 Additional Proposal of Load Factors 63
      • 5. CALIBRATION OF ULTIMATE LIMIT STATE V 67
      • 5.1 Statistical Model of Wind Load Effect Induced by Wind Velocity of 25m/s 67
      • 5.1.1 Formula of Wind Load Effect Induced by Wind Velocity of 25m/s 67
      • 5.1.2 Distribution Type of Wind Load Effect Induced by Wind Velocity of 25m/s 68
      • 5.1.3 Statistical Parameters of Wind Load Effect Induced by Wind Velocity of 25m/s 69
      • 5.2 Conditions for Calibration of Ultimate Limit State V 70
      • 5.2.1 Target Reliability Index, Resistances, and Load Effects for Ultimate Limit State V 70
      • 5.2.2 Ranges of DC-total Load Ratio and Wind Load Ratio 70
      • 5.3 Determination of L-R factors for Ultimate Limit State V 72
      • 5.3.1 Calibration Process of Ultimate Limit State V 72
      • 5.3.2 Proposed Load Factors for Ultimate Limit State V 74
      • 5.3.3 Results of Reliability Analyses by Proposed L-R Factors of Ultimate Limit State V 75
      • 6. CONCLUSIONS 85
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