附加黏滞和黏弹阻尼器的结构减震分析

Analysis About the Building Structure Seismic Response with Viscous and Viscoelastic Damper

为了更好地减少建筑结构的地震响应,研究将黏滞阻尼器和黏弹性阻尼器结合附加到建筑结构中。以9层钢筋混凝土框架结构工程为例,首先利用PKPM软件和ETABS软件建立了4种模型,振型对比分析发现:PKPM模型(无控结构)与ETABS模型a(无控结构)、模型b(附加黏滞阻尼器)和模型c(附加黏弹性阻尼器)的最大振型差分别为8%、7%和13%。结果说明:ETABS软件可取得较精确的结果,附加黏滞阻尼器后或黏弹性阻尼器后,结构的自振周期都有一定缩短,尤其是后者的作用效果更明显。再利用ETABS软件建立了5种模型,输入地震波后,对其层间最大位移角和最大位移进行对比分析,发现:较模型1(无控结构)而言,模型2(单独设置黏滞阻尼器)、模型3(单独设黏弹性阻尼器)、模型4(上层布置黏弹阻尼器结合下层布置黏滞阻尼器)和模型5(上层布置黏滞阻尼器结合下层布置黏弹阻尼器)的最大位移角分别减少了27. 2%、25. 7%、34. 7%和31. 8%,其最大位移分别减少了25. 3%、19. 0%、35. 4%和33. 2%,结果说明模型4的抗震性能最好,能达到有效的减震目的。

In order to reduce the seismic response of the building structures,the viscous damper and the viscoelastic damper are attached to the building structures. Taking 9-story reinforced concrete frame structure as an example,four models are established by using PKPM software and ETABS software. The comparative analysis of seismic modes show that the maximum modal difference between PKPM model( uncontrolled structure) and ETABS model a( uncontrolled structure),model b( additional viscous damper) and model c( additional viscoelastic damper) is 8%,7% and 13%,respectively. The results show that the ETABS software can obtain more accurate results,and the natural vibration period of the structure can be shortened after adding viscous damper or viscoelastic damper,especially the effect of the latter is more obvious. Then five models are established by using ETABS software,and the seismic waves are input into them,and the maximum position moving angle and the maximum position moving distance between the layers are compared and analyzed. It is found that compared with model 1( uncontrolled structure),the maximum position moving angle of model 2( with separate viscous damper),model 3( with separate viscoelastic damper),model 4( with upper layer viscoelastic damper combined with lower layer viscous damper) and model 5( with upper layer with viscous damper combined with lower layer of viscoelastic damper) is reduced by27. 2%,25. 7%,34. 7% and 31. 8%,respectively,and the maximum position moving distance of them is reduced by25. 3%,19. 0%,35. 4% and 33. 2%,respectively. The results show that model 4 has the best seismic performance and can achieve effective seismic performance.