数值计算模型对地下厂房动力特性的影响分析
发布时间:2018-09-03 20:44
【摘要】:结合某大型水电站地下厂房工程实际,采用三维有限元分析方法,对建立地下厂房结构动力分析数值计算模型涉及的混凝土动态弹性模量、阻尼比、围岩范围和边界条件对厂房结构自振特性和动力响应(动位移和动应力)的影响程度和规律进行了敏感性分析。计算结果表明:厂房整体结构自振频率受动态弹性模量取值、围岩范围和围岩边界条件影响较大,与阻尼比的取值无关;厂房结构动位移与动态弹性模量取值成反比,受围岩范围和边界条件的选择影响有限,受阻尼比取值影响很小;厂房结构动应力受动态弹性模量和阻尼比取值、围岩范围和围岩边界条件的选择影响很小。
[Abstract]:Combined with the practice of underground powerhouse engineering of a large hydropower station, the dynamic elastic modulus and damping ratio of concrete involved in the numerical calculation model of dynamic analysis of underground powerhouse structure are studied by using three-dimensional finite element analysis method. The influence of surrounding rock range and boundary conditions on the natural vibration characteristics and dynamic response (dynamic displacement and dynamic stress) of the powerhouse structure is analyzed. The results show that the natural vibration frequency of the whole structure is affected by the dynamic elastic modulus, the range of surrounding rock and the boundary condition of surrounding rock are greatly influenced by the damping ratio, and the dynamic displacement of the powerhouse is inversely proportional to the dynamic elastic modulus. The dynamic stress of powerhouse is affected by dynamic elastic modulus and damping ratio, but the choice of surrounding rock range and surrounding rock boundary condition is very little.
【作者单位】: 中国电建集团成都勘测设计研究院有限公司;大连理工大学;
【分类号】:TV731.6
[Abstract]:Combined with the practice of underground powerhouse engineering of a large hydropower station, the dynamic elastic modulus and damping ratio of concrete involved in the numerical calculation model of dynamic analysis of underground powerhouse structure are studied by using three-dimensional finite element analysis method. The influence of surrounding rock range and boundary conditions on the natural vibration characteristics and dynamic response (dynamic displacement and dynamic stress) of the powerhouse structure is analyzed. The results show that the natural vibration frequency of the whole structure is affected by the dynamic elastic modulus, the range of surrounding rock and the boundary condition of surrounding rock are greatly influenced by the damping ratio, and the dynamic displacement of the powerhouse is inversely proportional to the dynamic elastic modulus. The dynamic stress of powerhouse is affected by dynamic elastic modulus and damping ratio, but the choice of surrounding rock range and surrounding rock boundary condition is very little.
【作者单位】: 中国电建集团成都勘测设计研究院有限公司;大连理工大学;
【分类号】:TV731.6
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