1000MW级小倾角新型间冷塔振动台试验研究

Study on Shaking Table Test of a New Type of 1000 MW-class Indirect Cooling Tower with a Small Inclination

在对1000 MW级小倾角新型双曲线混凝土冷却塔进行振动台试验中,主要通过1∶25的缩尺模型进行三向地震作用下的动力试验,测定模型结构的动力特性及其不同阶段的变化,实测分别经受多遇、设防、罕遇等不同水准地震作用时模型的动力响应,包括结构在弹性和弹塑性阶段的位移、加速度及主要构件应变反应,观察、分析结构抗侧力体系在地震作用下的受力特点和破坏形态及过程,掌握超大型小倾角冷却塔的结构动力响应特性,并结合动力分析的结果,评价结构的可靠性,提出合理的抗震措施和结构建议。

In the shaking table test of a new type of 1000 MW-class hyperbolic concrete cooling tower with small inclination,the dynamic test under the action of three-way earthquake is carried out mainly by a scale model of 1:25,to measure the dynamic charac-teristics of the model structure and their changes at different stages.The dynamic response of the model is measured actually when sub-jected to multiple,fortification and rare earthquakes at different levels,including displacement,acceleration and strain response of main components in elastic and elastic-plastic stages,to observe and analyze the loading characteristics,failure forms and processes of structural lateral force resistance system under earthquake action,master the structural dynamic response characteristics of super large cooling tower with small inclination.Finally,based on the results of dynamic analysis,the reliability of the structure is evaluated,and the reasonable anti-seismic measures and structural suggestions are put forward.