Modal Analysis of Construction Trestle Structure of Danjiangkou Heightening Project in the South-to-North Water Diversion Project
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Abstract:
Vibration modal analysis is essential for the design of construction trestle. The modal analysis was performed on the temporary construction transportation trestle behind the 38 # ~ 25 # dam of the Danjiangkou dam heightening project in the South-to-North Water Diversion Project using the finite element analysis software ANSYS, and the natural frequencies and principal vibration modes for the first 8-order modals were determined. The results showed that the construction trestle might resonate when the frequencies of external drive are close to the natural frequencies of the construction trestle, which can cause serious damage to the structure of construction trestle. Moreover, the fourth, fifth, sixth, and eighth strides were weaker than other strides, therefore the stay of the cars with similar frequencies should be avoided. The results can provide significant basis for the dynamic design of trestle structure and the design of other structures.
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