【摘要】 为揭示非确定参数和广义损伤泛函对广义损伤场及广义损伤可靠度影响机理,基于自适应模糊随机损伤力学模型,以荆南长江干堤为例进行局部裂纹尖端应变能密度分析,证实了经模糊识别后,广义损伤场分析区域较之常规损伤模型宽广,符合工程结构具有多种可能工况和材料失效范围复杂的事实.考虑核心参数的空间变异,就模糊随机损伤增益下的宏观场分布进行敏感性研究,验证了岩土结构在重力工况下采用组合秋千模型进行广义损伤分析,可反映刚柔材料接触部位吸收较多能量从而诱发显著损伤发育的客观实际.采用不同模糊分布对自适应损伤力学模型进行激励分析,表明应用混合破坏准则对复杂结构广义可靠度的精细研究,可综合反映各区域的损伤水平.研究结果表明:在广义独立标准正态空间内,模糊随机损伤模型对损伤宏观分布的演绎,展示了材料微观、细观流动破坏诱发的结构宏观能量重分布,揭示了各模糊分布对广义损伤场流动演变的控制特征.更多还原

【Abstract】 To disclose the influential philosophy of uncertain parameters and generalized damage functional upon generalized damage field(GDF) and generalized damage reliability(GDR),based on the fuzzy-self-adaptive stochastic damage model founded in sequent research,the characteristics of local strain energy density on material crack tip were studied with introduction of Jingnan main dyke’s typical numerical model.Results show that the evolution field of GDF is broader than the conventional damage field’s with fuzzy identification for damage development,and this conclusion concurs with the nature of geo-structures with complicated failure zones under diverse working behaviors.Sensitivity of macroscopic field distribution produced by fuzzy-stochastic damage gaining was investigated under key material parameters’ spatial variation.The result shows that the energy–absorption concentration resides in the contact zone between clay(i.e.soft surface) and concrete break-wall(i.e.rigid surface) and full damage development exits thereby.These facts on geo-structures under gravity loading-condition were discovered during GDF analyses with combined-swing-distribution.Controlling distribution models were incorporated in the activation simulation on fuzzy-stochastic damage mechanics.The key consequence shows that the comprehensive failure criteria are indispensable measures for precise study on complex-structures’ GDR because it reveals the synthesized characters on the damage field distribution.The foregoing studies demonstrate that the deduction on macroscopic damage field illustrates the global energy redistribution with the fuzzy-self-adaptive stochastic damage model in an independent standard normal space;the micro-meso-flow of material particles induces the local deformation and the fuzzy redistribution;the generalized damage functional memberships control the particles’ flow evolution of GDF.更多还原