结构的能度可靠性方法和随机可靠性方法的比较

对能度可靠性方法和传统的随机可靠性方法，在不确定性的处理、模型结构和基于可靠性的结构优化设计等方面进行了比较研究。得到了一些有益的结论。说明了能度可靠性方法的有效性和优越性．由于结构的能度可靠性模型对已知数据的要求较低，计算过程较为简便。从而可使结构可靠性分析和设计中获取数据的难度大大降低，并有效降低计算工作量,具有较好的适用性。

Comparison of possibilistic reliability and stochastic reliability me thods for uncertain structures

Traditional stochastic reliability method has been widely accepted and used in the analysis and design of the structures. In the paper, a comparing possibilistic reliability method developed by authors in a previou s paper with the traditional stochastic reliability method proposed. Firstly, we compared the two reliabi lity methods in the modeling of uncertainties, model construction, and formulati ons for computation, etc. Then, we compared the structural optimization based on the reliability through a practical example. Some beneficial conclusions were o btai ned. Some results shown that, if there is sufficient information to build an acc urate model of uncertainties, the results of possibilistic reliability based on the opt imization may will be consistent with the stochastic reliability method. Whereas , when little information is available to build an accurate stochastic model, th e stochastic reliability calculat ion may lead to the large errors, but the possibilistic reliability procedure ma y offer safer the results. It is demonstrated further that the possibilistic rel iability method for the structures is reasonable, effective and useful.