摘要
进水塔内外的动水压力在塔体地震作用中占有重要比例,因此在进水塔地震作用效应的动力分析中必须考虑塔体和内外水体的动力相互作用。在ANSYS中动水压力是以附加质量的形式通过其内置的质量单元MASS21施加在塔体上。MASS21单元具有6个自由度,在每个坐标方向上可以定义不同的附加质量和转动惯量,然后通过实常数施加到模型中,如此就涉及到附加质量的方向取舍问题,即附加质量如何与地震作用方向相匹配,不同的计算方法会对结果产生较大的影响。文章以某岸塔式进水塔为例,对动水附加质量采用不同方法施加后塔体的动力响应进行对比研究,以探求一种合适的计算方法。
The hydrodynamic pressure inside and outside the power intake plays an important role in action of the tower body in earthquake.Therefore, the interaction of the tower body and water mass inside and outside the tower shall be considered while the hydrodynamic analysis on the earthquake action effect of the intake tower is performed. In ANSYS, the hydrodynamic pressure, as an additional mass and via the built-in unit MASS21, acts on the tower body. The MASS21 unit is with 6 degrees of freedom. The different additional masses and inertia moments can be defined along each coordinate direction. Then they are incorporated in model via the real constant. Accordingly, selection of directions of the ad- ditional masses is involved. Namely, how the additional mass can match the direction of the earthquake action. Quite difference ~ be resulted from different calculation methods. With the case of one intake tower, in the paper, the dynamic response of the tower body with the additional hydrodynamic mass acted by different methods is compared and studied to explore one suitable calculation method.
出处
《西北水电》
2015年第5期39-41,共3页
Northwest Hydropower
关键词
进水塔
动水压力
附加质量
有限元计算
intake tower
dynamic pressure
additional mass
calculation by finite element method
