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针对某网架结构,建立了非隔震、采用传统水平隔震支座和三维隔震支座的结构有限元模型,并分别对其进行自振特性分析和爆炸地震、天然地震输入下的时程分析,对比分析了各工况下结构的动力响应。结果表明:爆炸地震波具有频带宽、高频成分丰富和持时短的特点;天然地震作用下网架结构的位移和内力响应要远大于爆炸地震作用下的结构响应;采用水平隔震支座和三维隔震支座后明显延长了结构的自振周期,三维隔震支座对结构高阶振型周期的延长效果更加明显;相比水平隔震支座,三维隔震支座的隔震效果更好、通用性更强。
For a grid structure, a non-isolated, traditional horizontal isolation bearings and three-dimensional isolation bearing structure of the finite element model, and their natural vibration characteristics and explosive earthquakes, natural earthquake input Cheng analysis, comparative analysis of the dynamic response of the structure under various conditions. The results show that the blasting seismic wave has the characteristics of wide frequency band, high frequency content and short duration. The displacement and internal force response of grid structure under natural earthquake are much larger than those under explosive earthquake. The three-dimensional isolation bearing significantly prolongs the natural vibration period of the structure, and the three-dimensional isolation bearing more effectively prolongs the high-order vibration mode period of the structure. The isolation effect of the three-dimensional isolation bearing is better than that of the horizontal isolation bearing , More universal.