大跨度双幅桥面桥梁气动干扰效应

通过两座双幅桥面桥梁抗风性能的研究,采用节段模型风洞试验对双幅桥面桥梁的气动干扰进行了初步研究。研究结果表明:对于双幅桥面桥梁的气动干扰效应主要表现为对涡激共振响应的影响;对颤振稳定性的影响则表现为,与单幅桥面桥梁相比双幅桥面桥梁的颤振临界风速有所降低;双幅桥面桥梁三分力系数的气动干扰效应主要表现为,下游桥面阻力系数降低,上游桥面桥梁阻力系数与单幅桥面相比略有降低。

Aerodynamic interference effects of twin decks bridges with long span

Aerodynamic interference effects on twin decks bridges with long span were investigated preliminarily based on wind resistant research of two bridges with twin decks using section model wind tunnel tests.The research results show that the vortex shedding of twin decks bridges is effected mostly by aerodynamic interference of the twin decks;aerodynamic instability of the twin decks bridges is effected by the aerodynamic interference of twin decks also,and flutter instability velocity of twin decks bridges is below under that of single deck bridges;the aerostatic coefficients of twin decks bridges are effected by aerodynamic interference of twin decks;the drag coefficient of the leeward deck is much smaller than that of single deck;the drag coefficient of windward deck decreases slightly compared to that of single deck.4 tabs,10 figs,10 refs.