Research purposes: In order to prove the seismic response characteristics of low-pylon cable-stayed bridge of high speed railway, the (90+180+90) m low-pylon cable-stayed bridge was taken as a case study. Based on theoretical derivation and nonlinear finite element analysis, the average modal strain energy ratio was used as an indicator to identify the dominant modes of the bridge under earthquake, and its dynamic characteristics were also studied.
Research conclusions: (1) The average modal strain energy ratio can consider both the structure and ground motion characteristics. It can be used as an index for identifying the vibration mode of low-pylon cable-stayed bridge during seismic analysis with high efficiency and accuracy. (2) The dominant modes of the bridge with support system in x and z directions are more sensitive than that in y direction, which shows that the dynamic effect of the structure in these two directions is more obvious. (3) By comparing the mode response spectrum method and time history analysis, it can be concluded that the combination of dominant modes can meet the actual engineering needs, and the identification of dominant modes of bridges is of great significance for mastering the seismic response characteristics of structures, which can provide the basis for earthquake damage analysis and bridge seismic isolation design.
Key words
bridge engineering /
long-span low-pylon cable-stayed bridge /
high-speed railway /
dominant modes /
average modal strain energy ratio
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