large double-trough aqueduct;  finite element method;  Dynamic characteristics

The 20-node space block unit was used to divide the aqueduct body and the trough pier, and the coupling degree of freedom, low stiffness block unit and multiple spring units were used to simulate the lateral tie rod and stiffener of the trough body, the water body in the aqueduct and the basin rubber support, and the finite element model of the dynamic analysis of the structure of the large double-trough aqueduct was established, and the dynamic characteristics of a large double-trough aqueduct of the South-to-North Water Diversion Project were analyzed under multiple working conditions, and the influence of various factors such as the transverse tie rod of the aqueduct, the water body in the trough and the basin-type rubber support on the overall dynamic performance of the aqueduct was discussed. The calculation results show that the influence of the transverse tie rod of the aqueduct on the transverse dynamic characteristics of the aqueduct cannot be ignored, the vertical stiffness of the basin rubber support affects the dynamic characteristics of the aqueduct within a certain range, and the water level and distribution in the aqueduct have a great influence on the dynamic characteristics of the aqueduct.