【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。更多还原

【Abstract】 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.更多还原