中文摘要：

为研究三塔悬索桥的动力特性及颤振稳定性,以泰州长江公路大桥主桥为背景,开展数值分析和风洞试验。采用有限元软件ANSYS建立该桥模型,分析中塔对结构振型的影响,分析结果表明：中塔的设置使影响结构颤振稳定性的关键模态的频率降低很多。对节段模型进行颤振稳定性风洞试验,试验结果表明：将检修车轨道移到采用尖角型风嘴的上斜板位置后,模型在＋3°风攻角的颤振临界风速达到63.2 m/s。利用三维耦合颤振分析方法对该桥成桥状态＋3°风攻角下桥梁结构的颤振稳定性进行分析,分析结果表明：结构颤振时第15阶振型占绝大部分能量,说明颤振主要以扭转形态为主。

英文摘要：

To investigate the dynamic behavior and flutter stability of triple-tower suspension bridges,the main bridge of Taizhou Changjiang River Highway Bridge is cited as an example and the numerical analysis and wind tunnel tests are made for the purpose.The models for the bridge are established by the finite element software ANSYS and the influence of the intermediate tower of the bridge on the structural vibration modes is analyzed.The results of the analysis show that the existence of the intermediate tower reduces to a great extent the frequency of the critical modes that have influence on the structural flutter stability.The wind tunnel tests for the flutter stability of the sectional model are made and the results of the tests show that after the inspection trolley rails are moved to the upper inclined plates of the closed angle wind fairings,the critical wind velocity of the flutter of the model at the wind attack angle of ＋3° is 63.2 m/s.The three-dimensional coupling flutter analysis method is also used to analyze the flutter stability of the structure of the completed bridge at the wind attack angle of ＋3° and the results of the analysis show that the flutter mainly takes the form of the torsional mode,in which the 15th order vibration mode accounts for most of the energy proportion at the time of the flutter.