三十米高杆灯的风致振动的测量研究

EXPERIMENTAL STUDIES FOR WIND-INDUCED VIBRATION OF A 30M TALL LAMP POST STRUCTURE

本文通过环境激励的响应分析，研究了３０米高杆灯的动特性。然后，在发生风致振动的实际条件下，测量了振动频率和振型以及当时的风速，确认振动的原因是一种流固耦合作用形成的风的尾流脱落激励引起结构共振。文中讨论了环境激励响应测量的理论依据，测量方法、数据采集和分析技术，并给出了避免风致振动的理论依据及有关设计公式。

Experimental studies are carried out for determining the dynamic characteristics and finding the cause of vibration during windy season of a 30m tall lamp post structure by using the measured responses of the structure to random ground motion caused by traffic and wind load respectively. It is found that a steady wind of Beaufort force 6 may cause vortex shedding of a frequency coinciding with the second bending frequency of the structure. The theoretical basis of random response to ground motion, the experiment method, data acquisition and analysis techniques for identifying modal shapes and modal parameters are also expounded.