论文部分内容阅读
1.引言有限元法是力学问题的有效数值分析手段.但其模型是建立在确定性物理意义上的,即认为被分析的结构形状、几何特性、物理参数以及外载荷等都是确定值,并没有反映出分析对象的随机本质. 任何力学问题本质上都是随机的和非线性的.如钢结构的钢材,即使同一型号的钢,其屈服应力、弹性模量还是一个随机变量.至于其它的不确定因素更是不胜枚举,综合这些不确定性对结构失效作概率分析,就是近年来发展的结构可靠性分析.这是一种更合理的分析和设计方法,在许多工程领域中已经或正在取代传统的安全系数准则设计.
1. INTRODUCTION The finite element method is an effective numerical analysis method for mechanical problems. However, the model is based on a deterministic physical meaning. That is, the structural shape, geometric characteristics, physical parameters, and external loads are all determined values. Does not reflect the random nature of the object of analysis. Any mechanical problem is essentially random and non-linear. For steel of steel structure, even the same type of steel, its yield stress and elastic modulus are still a random variable. As for other The uncertainties are too numerous to enumerate. To combine these uncertainties in probabilistic analysis of structural failures is the structural reliability analysis developed in recent years. This is a more rational analysis and design method and has been applied in many engineering fields. Or is replacing traditional safety factor guidelines design.