球形储罐结构地震反应控制研究
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摘要
为了降低球罐结构的地震响应,对球形储罐进行基础隔震及附加耗能减震控制,建立了无控、隔震、耗能减震条件下球形储罐的有限元模型,并通过模态分析给出自振周期和频率。选择3种不同的地震波输入,进行了基础隔震结构及耗能减震结构地震响应时程分析。结果表明:基础隔震拉长了结构周期,达到了减震的目的,加速度反应降幅在41.4%~76.4%,相对位移反应降幅在50.3%~77.2%;附加的耗能装置的变形耗散了地震动能量,从而减小了结构自身的动力响应,加速度反应降幅在25.2%~77.9%,相对位移反应降幅在71.8%~76.7%;总体看球罐基础隔震结构优于附加耗能结构的减震效果。
In order to reduce seismic response of spherical tanks,base seismic isolation and additional energy dissipation control were given to them.A finite element model of spherical tanks was established under three conditions-no control,seismic isolation and energy dissipation.The free vibration cycle and frequency were obtained through modal analysis.With three different seismic wave inputs,time history analysis of seismic response was performed for the base seismic isolation and energy dissipation structures.The result showed that base seismic isolation increased the structural cycle,thereby achieving the goal of vibration damping,with acceleration response and relative displacement response reduced by 41.4 %~76.4 % and 50.3 %~77.2 % respectively.On the other hand,deformation of the additional energy dissipation device dissipated seismic energy,thereby reducing the dynamic response of the structure,with acceleration response and relative displacement response reduced by 25.2 %~77.9 % and 71.8 %~76.7 % respectively.As a whole,the base seismic isolation structure is better than the additional energy dissipation structure in terms of vibration damping.
In order to reduce seismic response of spherical tanks,base seismic isolation and additional energy dissipation control were given to them.A finite element model of spherical tanks was established under three conditions-no control,seismic isolation and energy dissipation.The free vibration cycle and frequency were obtained through modal analysis.With three different seismic wave inputs,time history analysis of seismic response was performed for the base seismic isolation and energy dissipation structures.The result showed that base seismic isolation increased the structural cycle,thereby achieving the goal of vibration damping,with acceleration response and relative displacement response reduced by 41.4 %~76.4 % and 50.3 %~77.2 % respectively.On the other hand,deformation of the additional energy dissipation device dissipated seismic energy,thereby reducing the dynamic response of the structure,with acceleration response and relative displacement response reduced by 25.2 %~77.9 % and 71.8 %~76.7 % respectively.As a whole,the base seismic isolation structure is better than the additional energy dissipation structure in terms of vibration damping.
引文
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