大型渡槽结构模态分析

大型渡槽在南水北调水利工程中起着重要作用。本文根据大型渡槽的结构特点，考虑渡槽横向弯扭耦合振动、约束扭转变形、渡槽支架变形和盆式橡胶支座等胶地支座等对渡槽动力作用的影响，应用梁段有限元方法，对某大型渡槽的模态进行分析，研究了该渡槽设计水位、渡槽支架高度、渡槽支架截面尺寸、渡槽盆式橡胶支座刚度变化等对大型渡槽模态的影响，探讨了该大型渡槽的上述４种工况下的模态变化范围，所得结果可为大型渡槽的抗震设计提

Modal analysis of large aqueducts

L arge aqueduct plays an important role in water conservancy works transporting 'water from the South to the North. In this paper, based on structural characteristic of large aqueduct, considering the influence of aqueduct traversal bending-twisting vibration, restraint twisting deformation, brace deformation and the rubber supports with basin shape on dynamic action, modes of a large aqueduct are analyzed by shell beam element method. Influence of designed water level, brace height, brace section size and stiffness of the rubber supports with basin shape on the mode of large aqueduct is investigated. Variation scopes of modes of the large aqueducts in four cases mentioned above are studied. The computation results lay the foundation for seismic design of large aqueduct.