摘要
在可靠度指标的基础上引入了置信度指标,提出可靠度与置信度的双可靠性指标的安全系数概念,并根据可靠性理论推导出新计算公式.该公式考虑了实验数据样本容量的影响,给出了小子样实验数据条件下的安全系数取值.将新安全系数应用于结构可靠性设计,算例结果表明,与其他方法相比,此方法计算结果安全系数更合理,且简单实用,能满足结构可靠性设计的要求,可取得显著的减重效果.
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.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2011年第6期766-770,共5页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(No.E050603)
航空科学基金资助项目(No.20095251024)
关键词
安全系数
结构设计
可靠度
置信度
safety factor
structural design
reliability level
confidence level
