[논문]신뢰도기반 교량설계기준의 중력방향하중 지배 한계상태에 대한 목표신뢰도지수 및 하중-저항계수

김정곤; 김호경; 이해성

doi:10.12652/ksce.2022.42.3.0299

신뢰도기반 교량설계기준의 중력방향하중 지배 한계상태에 대한 목표신뢰도지수 및 하중-저항계수
Target Reliability Index and Load-resistance Factors for the Gravitational Loads-governed Limit States for a Reliability-based Bridge Design Code 원문보기

KSCE Journal of Civil and Environmental Engineering Research = 대한토목학회논문집, v.42 no.3, 2022년, pp.299 - 309

김정곤 (서울대학교 건설환경공학부) , 김호경 (서울대학교 건설환경공학부, 건설환경종합연구소) , 이해성 (서울대학교 건설환경공학부)

초록
AI-Helper

신뢰도기반 교량설계기준에서 적용할 수 있는 새로운 종류의 차량활하중계수를 제시한다. 현재 사용하고 있는 차량활하중계수 1.8에 대한 적절성을 차량활하중의 재현주기와 교량설계수명에 기초하여 분석하였다. 중력방향하중 지배 한계상태에 대한 목표신뢰도지수 3.72는 적절한 논거 없이 너무 높게 설정된 값이며, 이에 상응하는 하중계수 1.8은 100년 설계수명 교량에서 재현주기 약 670만년 정도에 해당하는 활하중 파괴점을 나타내는 무의미한 값이라는 것을 보였다. 설계 풍속이나 지반가속도와 동일한 재현주기를 차량활하중에도 적용하면 차량활하중계수는 1.15 정도가 되고 목표신뢰도지수는 한계상태를 지배하는 하중에 따라서 2.0 혹은 2.5에 해당하게 된다. 제안한 목표신뢰도지수에 대한 전체 하중-저항계수 조합은 최적화에 의하여 산정하였다.

Abstract ▼ AI-Helper

This paper presents a new class of the vehicular live load factor for a reliability-based bridge design code. The significance of the current vehicular live load factor of 1.8 is investigated based on the return period of the vehicular live load and the design life of a bridge. It is shown that the current vehicular live load factor corresponds to a return period of 6.7 million years for a 100-year design life, which seems to be unrealistic in an engineering sense, and that the target reliability of 3.72 is set to too high without any reasoning for the gravitational load-governed limit state compared with that of the other limit states. In case the same return period as the design wind velocity or the ground acceleration is employed for the vehicular live load, the corresponding vehicular live load factor becomes around 1.15, and the target reliability index for the return period may be selected as 2.0 or 2.5 depending on the governing load effect. The complete sets of the load-resistance factors for the proposed target reliability indices are evaluated through optimization.

주제어

표/그림 (14)

표 Table 1. Statistical Characteristics of Normalized Random Variables in Eq. (2)
표 Table 2. Statistical Characteristics of Live Load Effect
그림 Fig. 1. Variation of Live Load Factor with Limit RRD in Logarithmic Scale
표 Table 3. Statistical Characteristics of Load Effects and Bending Strengths
그림 Fig. 2. Target Strengths of RC Member for Different Target Reliability Indices
그림 Fig. 3. Representative Components of Unit Normal Vectors at Failure Points of RC Member
그림 Fig. 4. Adjustment Factor for Limit States LS-1/2
그림 Fig. 5. Variation of Live Load Factor with Reliability Index for RC Member
그림 Fig. 6. Variation of Live Load Factor with Limit RRD in Linear Scale
그림 Fig. 7. Normalized Target and Nominal Strength of RC Member
그림 Fig. 8. Reliability Index Obtained by Load-Resistance Factors in Table 4 for RC Member
표 Table 4. Optimal Load-resistance Factors for Various Target Reliability Indices
그림 Fig. 9. Reliability Index Obtained by Load-Resistance Factors in Table 4 for ST Member
그림 Fig. 10. Reliability Index Obtained by Load-Resistance Factors in Table 4 for PC Member

참고문헌 (23)

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Lee, H. S. and Kim, J. H. (2019). "Wind pressure statistics and target reliability index for wind load-governed limit state of reliability-based bridge design codes." KSCE Journal of Civil Engineering, KSCE, Vol. 23, No. 5, pp. 2263-2271.

상세보기
Lee, H. S., Bae, C. H. and Kim, J. H. (2018). "Assessment of reliability levels and adjustment of load-resistance factors using optimization for gravitational loads-governed limit states of the AASHTO LRFD bridge design specifications." KSCE Journal of Civil Engineering, KSCE, Vol. 22, No. 9, pp. 3462-3472.

상세보기
Lee, H. S., Song, S. W. and Kim, J. H. (2019a). "New approaches for calibrating material factors of reinforced concrete members in korean highway bridge design code (Limit State Design) and reliability analysis." Journal of the Korean Society of Civil Engineers, KSCE, Vol. 39, No. 1, pp. 13-24.
Lee, H. S., Song, S. W. and Kim, J. H. (2019b). "Determination of optimal load-resistance factors for gravitational loads-governed limit state of Korean bridge design code." KSCE Journal of Civil Engineering, KSCE, Vol. 23, No. 8, pp. 3451-3463.

상세보기
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