连体高层隔震结构地震反应分析
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摘要
将隔震技术应用于连体高层结构,首先利用ANSYS建立了隔震支座的双线性力学模型,进而以某实际工程为原型建立了连体高层结构的抗震及隔震结构有限元模型。通过模态信息的对比发现采用隔震支座后结构前几阶周期有显著增大,同时影响连体结构的竖向振型出现阶次也有所增加。对比El Centro波激励下的响应时程可以看出,采用隔震支座可以显著减少主塔结构层间剪力、顶层加速度及结构关键部位的杆件应力,由此证明了隔震支座在该类结构上应用可以有效提高结构的抗震安全性。
Base isolation technique is applied to high- rise connected structure. ANSYS is first adopted to establish bilinear mechanical model,and then finite element models for both aseismic and base- isolated connected structures according to real structures. The comparison on modal characteristics shows that base isolation can extent the natural periods of the first few modes,and the mode shapes related to vertical vibration of the corridor is postponed. Further comparing the time- history responses under El Centro earthquake excitation,it is concluded that the base isolation can reduce the inter- storey shear force,the acceleration on the top floor,as well as the stress of key elements dramatically,which proofs the feasibility of base isolation technique on enhancing the aseismic safety of high- rise connected structure.
Base isolation technique is applied to high- rise connected structure. ANSYS is first adopted to establish bilinear mechanical model,and then finite element models for both aseismic and base- isolated connected structures according to real structures. The comparison on modal characteristics shows that base isolation can extent the natural periods of the first few modes,and the mode shapes related to vertical vibration of the corridor is postponed. Further comparing the time- history responses under El Centro earthquake excitation,it is concluded that the base isolation can reduce the inter- storey shear force,the acceleration on the top floor,as well as the stress of key elements dramatically,which proofs the feasibility of base isolation technique on enhancing the aseismic safety of high- rise connected structure.
引文
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[2]方鸿强.大底盘多塔楼连体复杂高层建筑群结构设计[J].建筑结构学报,2009,(S1):115-119.
[3]丁阳,张向荣,李忠献.应用SMA复合橡胶支座的大跨度空间结构隔震研究[J].沈阳建筑大学学报,2005,21(5):438-444.
[4]国巍,余志武,国振.多点激励下大跨隔震结构分析模型[J].华中科技大学学报,2012,40(009):101-105.
[5]薛素铎,李雄彦,潘克君.大跨空间结构隔震支座的应用研究[J].建筑结构学报,2010,2.
[6]李永华,李思明.高位隔震连体结构地震反应分析[J].华东交通大学学报,2007,24(5):34-38.
[7]徐自国,肖从真等.北京当代MO MA隔震连体结构的整体分析[J].土木工程学报,2008,41(3):53-56.
[8]施卫星,孙黄胜,李振刚.上海国际赛车场新闻中心高位隔震研究[J].同济大学学报,2005,33(12):1576-1580.
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