The Seismic Responses And Experiment Research On The Models Of Cooling Tower

Natural draft cooling tower is an important construction in power plant and its safety concerns economic development greatly. In nature, cooling tower is influenced by gravity, wind pressure, earthquakes and temperature, in which seismic-resistance is an important aspect. At present, most research on dynamics of cooling tower is based on FEM. However in this thesis, vibration experiment and FEM calculations are all used to research seismic-resistance of organic model and steel model, which is meaningful in practical engineering applications.Two cooling tower models of 1:200 reduced-scales are built to make analysis of model properties and dynamic responses. First, natural frequencies and damping are measured by hammering experiments, comparison with the results of ANSYS calculations are made. Transient responses and spectrum analysis responses of organic cooling tower model under EL-centro, Koyna and song seismic waves are calculated by ANSYS. At last, dynamic responses of steel cooling tower model under two periodic incentives are analyzed by using ANSYS and vibration experiments, also make comparison. The results showed that: some modes in ANSYS are recognizable in experiments. The responses of organic cooling tower model under EL-centro seismic wave are bigger than the other two and are similar to results of spectrum analysis, so time history response analysis are necessary. Motivated by various acceleration incentives, responses of the supporting columns are bigger.It is the first time that finite element analysis and vibration experiments are used together to research the responses of cooling tower initially, the results can give some guide to seismic responses design.