横观各向同性对碾压混凝土重力坝动力特性的影响
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摘要
碾压混凝土重力坝是采用逐层碾压施工方法形成的大体积混凝土,在竖向和水平向具有不同的弹性常数。采用有限元方法,研究在弹性地基上空库和正常蓄水位两种工况下碾压混凝土重力坝的动力特性,及横观各向同性对坝体动力特性的影响。结果表明,横观各向同性对坝体振型影响不大,但竖向弹性模量的减小使坝体自振频率值明显降低。
The Roller Compacted Concrete(RCC) dam has different elastic constants in horizontal and vertical directions because it is a mass concrete structure with layer by layer compaction in the construction.In this paper,the dynamic characteristics and influence of the cross-isotropy on the dynamic characteristics of the RCC gravity dam in the elastic foundation were studied by using finite element method under empty-reservoir and normal water level conditions.The results indicated that the influence on the mode shapes of the dam is small,but the natural frequencies of the dam have an obvious reduction with the decrease of vertical elastic modulus.
The Roller Compacted Concrete(RCC) dam has different elastic constants in horizontal and vertical directions because it is a mass concrete structure with layer by layer compaction in the construction.In this paper,the dynamic characteristics and influence of the cross-isotropy on the dynamic characteristics of the RCC gravity dam in the elastic foundation were studied by using finite element method under empty-reservoir and normal water level conditions.The results indicated that the influence on the mode shapes of the dam is small,but the natural frequencies of the dam have an obvious reduction with the decrease of vertical elastic modulus.
引文
[1]柯敏勇,洪晓林.碾压混凝土拱坝三维弹塑性有限元分析[J].水利水运科学研究,2000,(1):36-42.
[2]王光纶,张楚汉.碾压混凝土成层特性对重力坝静、动力分析的影响研究[J].红水河,1995,14(1):28-35.
[3]钱胜国,陆秋蓉.重力坝-库水-地基动力相互作用对坝体的影响[J].长江科学院院报,1995,12(4):19-24.
[4]曾贵香,何耀民,胡少伟.基于ANSYS的碾压混凝土重力坝抗震性能分析[J].世界地震工程,2007,23(1):110-115.
[5]陈龙,吴中如.碾压混凝土坝层内力学参数渐变分析模型[J].水利学报,2006,37(3):325-327.
[6]牛景太,傅克斌.层间弹性模量变化对碾压混凝土坝层间应力影响的研究[J].水力发电,2007,33(3):35-36.
[2]王光纶,张楚汉.碾压混凝土成层特性对重力坝静、动力分析的影响研究[J].红水河,1995,14(1):28-35.
[3]钱胜国,陆秋蓉.重力坝-库水-地基动力相互作用对坝体的影响[J].长江科学院院报,1995,12(4):19-24.
[4]曾贵香,何耀民,胡少伟.基于ANSYS的碾压混凝土重力坝抗震性能分析[J].世界地震工程,2007,23(1):110-115.
[5]陈龙,吴中如.碾压混凝土坝层内力学参数渐变分析模型[J].水利学报,2006,37(3):325-327.
[6]牛景太,傅克斌.层间弹性模量变化对碾压混凝土坝层间应力影响的研究[J].水力发电,2007,33(3):35-36.
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