大型渡槽动力建模研究

根据渡槽系薄壁杆件结构的特点，提出了渡槽薄壁结构空间动力分析模型。采用空间梁段单元进行离散，考虑渡槽横向、竖向、纵向、自由扭转和约束扭转变形，由能量原理推导给出了渡槽槽身结构的单元刚度矩阵、质量矩阵的显示表达式；渡槽支架采用空间梁单元模拟；渡槽支架与槽身联贯的盆式橡胶支认采用弹性元件单元模拟。文中具体计算了某大型渡槽的模态，计算结果表明：该模型计算渡槽结构的固有频率与理论解和用大型结构分析程序SAP计算的结果良好接近。本文模型计算简单，使用方便，是大型渡槽动力分析的实用模型。

Dynamic modeling study of large-scale aqueducts

Based on shell bar structural characteristic of aqueducts, a model for spatial dynamic analysis of aqueducts with shell bar structure is presented. The aqueduct is discretely meshed into spatial beam element. Considered traversal and longitudinal deformations as well free and restraint twist deformation, explicit formulae of element stiffness and mass matrix of the aqueduct body are derived by energy principle. The brace of aqueducts is simulated into beam elements. The rubber supports with basin shape linking the brace and body of the scale aqueduct are simulated using spring elements. Finally, the modes and the vibration frequencies of the aqueduct of a large scale aqueduct are examined. The computational results are good, compared with the analytical ones and SAP software's. It is confirmed that the model of this paper is simple and practical for dynamic analysis of the large scale aqueducts.