aqueduct;  finite elements;  modality;  Seismic response

In order to analyze the structural dynamic performance of an aqueduct in the South-to-North Water Diversion Project, so as to provide strong support for the engineering design, the finite element discretization of the aqueduct was carried out by using 8-node space block units. With the help of SAP 93 finite element analysis software, the modal analysis of the aqueduct under four working conditions (no water in the tank, water in the tank, no expansion joint in the aqueduct, and expansion joint in the aqueduct) and the calculation of the dynamic response time history under seismic load were carried out. The results show that in the absence of water, the frequency of each order without expansion joint is greater than the corresponding frequency of each order when there is expansion joint. The same result is true when there is water in the aqueduct. For aqueducts with the same structure, the frequency of each order in the absence of water is greater than the corresponding frequency of each order when there is water.