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施工误差、杆件的初偏差等不可控制因素必然导致网壳结构具有一定的初始缺陷.初始缺陷及其随机性是影响结构稳定和承载力的重要因素.基于标准正交基的随机场展开法为理论基础,通过对随机初始缺陷相关结构的分解将其投影在结构屈曲模态正交基上.算例表明,本方法可以用较少的随机变量描述原随机缺陷场,从而全面高效地寻求初始缺陷的最不利分布形式,保证缺陷敏感性结构具有较高的安全可靠性,适用于大型工程结构的随机缺陷分析.
Uncontrollable factors such as construction error and initial deviation of bar will inevitably lead to some initial defects in the reticulated shell structure.The initial defect and its randomness are important factors that affect the stability and bearing capacity of the structure.The random field expansion method based on orthonormal basis As the theoretical basis, the projection of the related structure of stochastic initial defects on the structural buckling mode orthogonal basis shows that this method can describe the original stochastic fault field with fewer random variables, The most unfavorable distribution pattern of initial defects ensures that the structure with defect sensitivity has high safety and reliability and is suitable for the analysis of random defects in large-scale engineering structures.