Fluid-solid Interaction Dynamic Response Analysis Of Concrete Aqueduct Structure

The safe operation of the aqueduct structure is of great significance to the hydraulic engineering. Currently, our country’s seismic code for aqueduct structure is still included in the design code. It is necessary to analyze aqueduct dynamic response characteristics for the construction and design, providing scientific support and calculation basis.This paper is based on an aqueduct project and making a literature review on the former research. ANSYS software is being used for analyzing single span aqueduct dynamic response characteristics, the following results are deduced in this research:.(1) Using ANSYS software to build concrete aqueduct engineering finite element model. Aqueduct without water hydraulic conditions and design conditions should be taken into consideration. Westergaard additional quality model and Housner Fluid-Solid Interaction simplified model to simulate the effects of water in the aqueduct.(2) The natural frequency of aqueduct under the two working conditions is calculated. The aqueduct structure’s first 30 th order natural frequency under design water level condition is less than that without water condition. This conclusion matches the physical conclusion. The different vibration mode of natural frequency shows different growth trend. Westergaard added mass model’s frequency is less than Housner Fluid-Solid Interaction simplified model.(3) Comparing the two working condition’s first 10 th aqueduct vibration mode. It states that the mainly vibration mode is that aqueduct pier deformation under without water condition, whereas the aqueduct’s mainly vibration mode is lateral deformation under designing water level condition. When using Westergaard’s model calculates the aqueduct’s vibration mode is later than Housner Fluid-Solid Interaction simplified model.(4) In order to compare the dynamic response result, El-Centro earthquake wave is input for aqueduct. Without water conditions aqueduct computing node extreme value is less than the design water level conditions. The extreme value of using Westergaard added mass model to calculate the stress and strain is greater than that of the Housner Fluid-Solid Interaction simplified model. The Westergaard’s extreme value of the node speed and displacement is about 0.5 to 1.7 times greater than the Housner’s extreme values.(5) Westergaard added mass model’s node values are 0.2 to 0.5 times greater than node values which are calculated by using Housner Fluid-Solid Interaction simplified model. Regarding to the aqueduct bottom floor, wall and top floor, the Westergaard’s node stress extreme values and Housner’s extreme values are approached each other.