静态人群-结构相互作用人行桥模态参数试验

针对静态人群-结构相互作用下人行桥模态参数影响进行试验研究,以实验室钢结构玻璃人行桥为研究平台.研究内容如下:测试环境激励下人行桥动力参数;测试静态人群作用在人行桥不同位置、不同姿势下结构的动力参数变化.结果表明:静态人群-结构相互作用下,随着作用人数增加,结构自振频率逐渐降低,阻尼比逐渐增大.坐姿对结构频率影响最大;四人作用下结构自振频率由空载时的4.381 Hz减小至3.643 Hz,降低了16.8%;半蹲姿势对阻尼比影响最大,四人作用下结构阻尼比由0.660%增加至4.888%,增加了640.6%.静态人群位于某阶振型峰值点处时,对应此阶模态结构频率最小,阻尼比最大.

Experimental study on modal parameters of pedestrian bridge with static crowd-structure interaction

In this paper, the effect of modal parameters of pedestrian bridge under static crowd-structure interaction is studied, and the steel structure pedestrian glass bridge is used as the research platform. The research contents are as follows: the dynamic parameter of the pedestrian bridge under the excitation of the test environment and the dynamic parameters of the structure under different positions are changed under the action of the static crowd in different positions of the pedestrian bridge. The results show that under the static population-structure interaction, with the increase of the number of people acting, the natural frequency of the structure decreases and the damping ratio increases gradually. The sitting posture has the greatest influence on the structural frequency, the natural vibration frequency of the structure decreases from 4.381Hz to 3.643Hz, which is decreased by 16.8% under the action of four people, and the semi-squatting position has the greatest effect on the damping ratio. The damping ratio of the structure increases from 0.660% to 4.888%, which is increased by 640.6% under the action of four people. When the static population is located at the peak point of a certain order mode, the frequency of the corresponding modal structure is the smallest and the damping ratio is the largest.