數(shù)值計(jì)算模型對地下廠房動力特性的影響分析
發(fā)布時(shí)間:2018-09-03 20:44
【摘要】:結(jié)合某大型水電站地下廠房工程實(shí)際,采用三維有限元分析方法,對建立地下廠房結(jié)構(gòu)動力分析數(shù)值計(jì)算模型涉及的混凝土動態(tài)彈性模量、阻尼比、圍巖范圍和邊界條件對廠房結(jié)構(gòu)自振特性和動力響應(yīng)(動位移和動應(yīng)力)的影響程度和規(guī)律進(jìn)行了敏感性分析。計(jì)算結(jié)果表明:廠房整體結(jié)構(gòu)自振頻率受動態(tài)彈性模量取值、圍巖范圍和圍巖邊界條件影響較大,與阻尼比的取值無關(guān);廠房結(jié)構(gòu)動位移與動態(tài)彈性模量取值成反比,受圍巖范圍和邊界條件的選擇影響有限,受阻尼比取值影響很小;廠房結(jié)構(gòu)動應(yīng)力受動態(tài)彈性模量和阻尼比取值、圍巖范圍和圍巖邊界條件的選擇影響很小。
[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.
【作者單位】: 中國電建集團(tuán)成都勘測設(shè)計(jì)研究院有限公司;大連理工大學(xué);
【分類號】: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.
【作者單位】: 中國電建集團(tuán)成都勘測設(shè)計(jì)研究院有限公司;大連理工大學(xué);
【分類號】:TV731.6
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