大跨度桥梁多模态耦合颤振的TMD控制

推导了装有TMD的结构在气动自激力作用下的动力微分方程,基于模态空间中多模态耦合颤振分析手段,运用考虑安装TMD的多模态自动分析法对结构-TMD系统进行了颤振分析和TMD控制分析,使多模态自动分析法能适用于TMD颤振控制分析,避免了双参数搜索和迭代计算,提高了计算效率。对某在建三塔悬索桥进行了原结构颤振分析和TMD-结构颤振频域分析,探讨TMD控制参数对颤振临界风速的影响。

Multi-mode coupled flutter numerical simulation for TMD control of long-span bridges

This study addresses the methodology and parameter study of TMD control for long-span bridges.The differential equations governing the motion of the structure with TMDs are established in the mode space,in which the effects of aerodynamic self-excited force are taken into account.The revised automatic analysis for multimode-coupled flutter,which is the single parameter searching method without iterations,is adapted for the flutter control analysis of structure-TMDs system based on the complex modal theory.Taking a three-tower suspension bridge being built crossing the Yangtze River for a numerical example,the flutter analysis of the original bridge and flutter control analysis of bridge-TMDs system are performed.The TMD parameters are discussed for influence of critical wind speed.