Study On Seismic-resistance And Isolation Of Large-scale Aqueduct

The large water conservancy engineering transporting water from south to north will relieve the lack of water resource of North-West and North-China regions. It has been wrote into "Tenth Five-year Plan" of China. As a building spanning rivers to transport water, large-scale aqueduct plays an important role in this water conservancy engineering. It is important to ensure the seismic-resistance security of large-scale aqueduct under earthquake load. In this paper, based on the tentative design of design department, using space beam element and plate and shell element, the finite element model of aqueduct is built. Aqueduct of Ming-he in the middle of the engineering is analyzed by ANSYS finite element program. The dynamic characteristic of large-scale aqueduct is analyzed under four cases (aqueduct without water, aqueduct with water in three troughs, aqueduct with water in the middle trough, aqueduct with water in side troughs), and the results can be applied to seismic-resistance design of large-scale aqueduct. The earthquake time history response of large-scale aqueduct is studied under four cases when the EL-Centro earthquake wave is inputted. In the paper, base isolation technology is applied to avoid the destroy arising from the bigger stress in aqueduct. The results provide design parameters for engineering design. Analysis results indicate that base isolation technology has obviously seismic isolating effect, and decreases maximum response of structure sharply when earthquake occurs, and isolates seismic energy effectively. Based on the analysis, some suggestion for engineering design of aqueduct is given, and the problems that need to be further studied are presented.