Based on a suspension footbridge, the pedestrian-bridge section models were first proposed and designed. Then, the free vibration tests were carried out to study the influence of pedestrians on the flutter derivatives (H₁^*, A₂^*, A₃^*, H₄^*, and A₁^* × H₃^*) which significantly affect the flutter of suspension footbridges. It can be found that: 1) with an increase in the pedestrian density, the H₁^*, H₄^* and A₁^* × H₃^* increase, which will lead to the decrease in the positive vertical aerodynamic damping, the positive vertical aerodynamic stiffness and the positive vertical and torsional aerodynamic damping, respectively. Meanwhile, with an increase in the pedestrian density, the A₂^* and A₃^* decrease, which will lead to a decrease in the negative torsional aerodynamic damping and the negative torsional aerodynamic stiffness, respectively. 2) The arrangement of walking side by side is advantageous to the positive vertical aerodynamic damping and disadvantageous to the negative torsional aerodynamic stiffness. The arrangements of random walking with low-medium pedestrian densities and walking in line with high-medium pedestrian densities are disadvantageous to the vertical aerodynamic stiffness and the positive vertical and torsional aerodynamic damping. Besides, all the pedestrian arrangements have a significant influence on the torsional aerodynamic damping.

首先基于悬架人行桥，提出并设计了人行天桥断面模型。然后，进行了自由振动试验，以研究行人对颤振导数（H ₁ ^*，A ₂ ^*，A ₃ ^*，H ₄ ^*和A ₁ ^* × H ₃ ^*）的影响，这些显着影响颤振悬索行人天桥。可以发现：1）随着行人密度的增加，H ₁ ^*，H ₄ ^*和A₁ ^* × H ₃ ^*增加，这将分别导致正垂直空气动力学阻尼，正垂直空气动力学刚度以及正垂直和扭转空气动力学阻尼的减小。同时，随着行人密度的增加，A ₂ ^*和A ₃ ^*减小，这将分别导致负扭力空气动力学阻尼和负扭力空气动力学刚度的降低。2）并排行走的布置有利于正向的垂直空气动力学阻尼，而不利于负的扭转空气动力学刚度。具有低中行人密度的随机行走和与中行人密度一致的行走的布置不利于垂直空气动力学刚度以及正的垂直和扭转空气动力学阻尼。此外，所有的行人布置都对扭转空气动力阻尼产生重大影响。