【摘要】 通过对大型超高钢结构电视塔1/40整体模型模拟地震振动台试验,测试了模型结构的动力特性,及其在8度多遇、8度基本以及8度罕遇烈度地震作用下的阻尼比、频率变化和塔楼顶部位移,并根据试验结果和相似理论,分析了原型结构的地震反应。试验及分析结果表明,原型结构前三阶自振频率为0.303 Hz(X向平动)、0.317 Hz(Y向平动)和0.625 Hz(扭转),对应的振型周期依次为3.3 s、3.15 s和1.6 s,其扭转周期与前两阶平动周期的比值分别为0.48和0.51,且在8度多遇和罕遇地震作用下结构最大层间位移角分别为1/807和1/99,表明原型结构整体抗震性能较好,能够抵抗所在地区设防烈度下各水准地震作用。更多还原

【Abstract】 A series of earthquake simulation tests were carried out on a shaking table with different waves and different earthquake levels for 1/40 model of a super high steel TV tower.Its dynamic properties,seismic responses,damping ratios and the variations of the natural frequency under different wave peaks were studied.The seismic responses of the prototype structure were studied based on the similitude theory.With the data achieved in the test,the first three frequencies of the structure are 0.303Hz(translation in direction X),0.317Hz(translation in direction Y),and 0.625Hz(torsion), the corresponding periods are 3.3s,3.15s and 1.6s.The ratio of period of the torsion to those in two horizontal directions are 0.48 and 0.51,the maximum inter-story drifts under frequently occurred earthquake and seldom occurred earthquake are 1/807 and 1/99,the results indicate that the structure has a good earthquake-resistant behavior,and can satisfy the requirement of the building code.更多还原