A Study on Reliability of Current Ultimate Strength Design for Reinforced Concrete

현행(現行) 철근(鐵筋)콘크리트 극한강(極限强) 설계법(設計法)의 신뢰성(信賴性)에 관(關)한 연구(硏究)

  • 이봉학 (강원대학교 공과대학 토목공학과)
  • Published : 1982.10.31

Abstract

Reliability analysis methods have been employed in this study to determine the safety index ${\beta}$ for flexure associated with reinforced concrete designs that are in accordance with current USD code of Korea. In reliability analysis, the mean first-order second-moment methods are employed. The following specific conclusions can be drawn from this study; 1) Levels of safety for reinforced concrete design, measured by ${\beta}$, vary from 2.8 to 3.8 in flexure depending on the limit state, the ratio of live load to dead load and the uncertainties. 2) Target reliability ${\beta}$ associated with reinforced concrete beams in flexure is assumed to be 3.5~4.0 in Korea. 3) Load factors and resistance factors in flexure associated with the current provisions contained in USD code generally seem to be too high. The writer concluded the factors as following; ${\phi}=0.8,\;{\gamma}_D=1.1\;{\gamma}_L=1.75$.

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