碾压混凝土重力坝的广义损伤可靠度及敏感性
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国家自然科学基金资助项目(50379046);教育部博士点基金资助项目(A50221)


Generalized Damage Reliability and Sensitivity Analysis on Rolled-Concrete Gravity Dam
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    摘要:

    为深化模糊随机损伤力学研究,基于自适应模糊随机损伤力学模型,对材料裂纹尖端广义损伤应力场进行分析,证实了数值模型的可靠性。以碾压混凝土重力坝为例,并考虑材料参数空间变异,就模糊随机损伤增益下的宏观场分布做敏感性研究,结果表明,碾压混凝土抗压强度极限值是影响大坝安全的主控指标。采用不同模糊分布对自适应损伤力学模型做激励分析,揭示了各分布对混凝土及岩石类材料广义损伤场演化的控制特征。

    Abstract:

    Based on fuzzy self-adapting stochastic damage model, the characteristics of generalized damage stress field on material crack tip are studied. The results express that the numerical algorithm is reliable. Sensitivity of rolled-concrete gravity dam under fuzzy-stochastic damage gaining is implemented by considering the spatial variation of material parameters. It is found that the compression strength of rolled-concrete is the governing index on gravity dam reliability. The activation simulations on fuzzy self-adapting stochastic damage model were carried by adopting different fuzzy distributions, which indicated the governing characteristics of the distribution on generalized damage evolution of rock-like material.

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王亚军,张我华,张楚汉,金峰.碾压混凝土重力坝的广义损伤可靠度及敏感性[J].土木与环境工程学报(中英文),2011,33(1):77-86. WANG Ya-jun, ZHANG Wo-hua, ZHANG Chu-han, JIN Feng. Generalized Damage Reliability and Sensitivity Analysis on Rolled-Concrete Gravity Dam[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2011,33(1):77-86.10.11835/j. issn.1674-4764.2011.01.014

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  • 收稿日期:2010-09-15
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