Aerodynamic Behavior of long-span Bridge with Different Flat plate sections
碩士 === 淡江大學 === 土木工程學系 === 91 === This thesis investigates the effects of width-to-depth ratios (B/D) of flat plate sections on aerodynamic behavior of long-span bridges. Six bridge decks with different B/D ratios were chosen for wind tunnel testing. The flutter derivatives and wind force coefficien...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2003
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/66376037871345825418 |
| Summary: | 碩士 === 淡江大學 === 土木工程學系 === 91 === This thesis investigates the effects of width-to-depth ratios (B/D) of flat plate sections on aerodynamic behavior of long-span bridges. Six bridge decks with different B/D ratios were chosen for wind tunnel testing. The flutter derivatives and wind force coefficients of these sections were carried out by section model tests in smooth flow. The logarithmic decrement method and the artificial neural network method were respectively used to identify the flutter derivatives. The results obtained from these two methods are in good agreement.
The flutter critical wind speed and buffeting response of the bridge with different decks were then evaluated by numerical analysis. The results show that the width-depth ratio has significant influence on aerodynamic stability of long-span bridge. With the increase of width-depth ratio, the flutter critical wind speed of bridge will increase. The drag buffeting response increases as the B/D ratio decreases. However, the lift and the torsional buffeting responses increases with the B/D ratio.
|
|---|