引入集合扩展约束的结构非概率可靠性模型

NON-PROBABILISTIC STRUCTURAL RELIABILITY MODEL INTRODUCED RESTRICTIONS ON SET EXPANSION

指出结构可靠性问题中不确定性量分散类型的差异,在原有info-gap(information-gap)模型中引入扩展约束参数,建立含约束的info-gap模型,原有info-gap模型可视为新模型的特殊形式。将含约束的info-gap模型应用于结构非概率可靠性方法中,能更充分地利用已知不确定性信息对可靠性作出评价,显示参量约束信息对结构可靠性的影响。算例显示,忽略不确定性参量变化范围约束的非概率可靠性分析会得到过于保守的分析结果。

The difference of the dispersion style of the uncertainty quantities in the practical structural reliability problems was pointed out. The info-gap（information-gap） model with restriction was advanced by introducing a new parameter in the origin model. The new model could be degenerated into the origin model. The non-probabilistic structural reliability method with the info-gap model introducing restriction parameter could utilize the existing information thoroughly and estimate the structural reliability more reasonably. Comparing with the existing model the new non-probabilistie structural reliability model could reveal the influence of the restriction information on structural reliability. The numerical example shows that the non-probabilistic reliability index ignored the restriction of uncertainty quantities span would be too conservative.