基于可靠度與置信度的雙可靠性指標安全系數方法

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基金項目:

國家自然科學基金資助項目(No.E050603)

航空科學基金資助項目(No.20095251024)

Safety factor with two-indexes of reliability and confidence levels

1. Shanghai Aircraft Customer Service Co. Ltd., Shanghai 200241, China;
2. School of Transportation Science and Engineering, Beihang University, Beijing 100191, China;
3. Structual Strength Deparment, Shenyang Aircraft Design and Research Institute, Shenyang 110035, China

摘要: 在可靠度指標的基礎上引入了置信度指標,提出可靠度與置信度的雙可靠性指標的安全系數概念,并根據可靠性理論推導出新計算公式.該公式考慮了實驗數據樣本容量的影響,給出了小子樣實驗數據條件下的安全系數取值.將新安全系數應用于結構可靠性設計,算例結果表明,與其他方法相比,此方法計算結果安全系數更合理,且簡單實用,能滿足結構可靠性設計的要求,可取得顯著的減重效果.
- 安全系數 /
- 結構設計 /
- 可靠度 /
- 置信度
Abstract: The concept of safety factor with two-indexes of reliability and confidence levels was presented by introducing the confidence level index.Based on the reliability theory,new formulae of safety factor with two-indexes of reliability and confidence levels were derived to take the sample size of experimental data into account and to determine the safety factor value from small sample test data for structural reliability design.The new safety factor was applied to two sets of experimental results,demonstrating the practical and convenient use of the proposed technique.It is shown from these examples that the safe factor can be obtained realistically according to small sample test data using the new formulae.
- safety factor /
- structural design /
- reliability level /
- confidence level