多层不均匀偏心框架结构扭转地震反应规律
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摘要
为研究刚度、质量非均匀偏心多层框架结构的扭转地震反应规律,设计均匀和非均匀的质量、刚度偏心框架结构算例各一组,通过计算对比分析其扭转反应规律。结果表明,非均匀质量偏心结构在偏心率相同的情况下顶层偏心时反应最大,底层偏心反应最小;非均匀刚度偏心时规律相反;每层均匀偏心比某一层相同偏心率的偏心结构扭转反应更大;每层刚、质心重合的具有偏置裙房的结构具有明显的扭转反应,相比各层刚心一致而底层具有相应质量偏心率的结构扭转反应大很多。
In order to investigate torsional response of multi-storey eccentric structures with non-uniform stiffness and mass distributions along height,two groups of eccentric frame structures with uniform / non-uniform mass and stiffness eccentric are conceived as numerical examples in this paper. The rule of torsional earthquake response of the structures is analysed and contrasted. The results indicate that: if the structures have the same mass-eccentric ratio in some storey,the one with maximal torsional response is the one with eccentricity at the top storey; instead,the one with minimal torsional response is the one with eccentricity at the bottom storey. The above rule is inversed when stiffness-eccentric instead. Moreover,the torsional response of the one with uniform eccentricity at every storey is higher than those with eccentricity at only one storey. The structures without eccentricity at any other storey but with asymmetric eccentric podiums exhibit noticeable torsional response which is far above the one with uniform stiffness center at every storey but with respective mass eccentricity ratio at the corresponding storey.
In order to investigate torsional response of multi-storey eccentric structures with non-uniform stiffness and mass distributions along height,two groups of eccentric frame structures with uniform / non-uniform mass and stiffness eccentric are conceived as numerical examples in this paper. The rule of torsional earthquake response of the structures is analysed and contrasted. The results indicate that: if the structures have the same mass-eccentric ratio in some storey,the one with maximal torsional response is the one with eccentricity at the top storey; instead,the one with minimal torsional response is the one with eccentricity at the bottom storey. The above rule is inversed when stiffness-eccentric instead. Moreover,the torsional response of the one with uniform eccentricity at every storey is higher than those with eccentricity at only one storey. The structures without eccentricity at any other storey but with asymmetric eccentric podiums exhibit noticeable torsional response which is far above the one with uniform stiffness center at every storey but with respective mass eccentricity ratio at the corresponding storey.
引文
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[2]李英民,刘立平.汶川地震建筑震害与思考[M].重庆:重庆大学出版社,2008
[3]韩军.建筑结构扭转地震反应分析及抗扭设计方法研究[D].重庆:重庆大学,2009
[4]韩军,李英民,潘毅,等.偏心框剪结构地震作用下弹塑性扭转反应分析[J].工业建筑,2012,42(3):1-6(Han Jun,Li Yingmin,Pan Yi,et al.Rule of elasto-plastic torsional response of the eccentric frame-shear wall structure under earthquake action[J].Industrial Construction,2012,42(3):1-6(in Chinese))
[5]李英民,韩军,刘建伟.建筑结构抗震设计扭转周期比控制指标研究[J].建筑结构学报,2009,30(6):77-85(Li Yingmin,Han Jun,Liu Jianwei.Study on torsional period ratio control index for seismic design of building structures[J].Journal of Building Structures,2009,30(6):77-85(in Chinese))
[6]蔡贤辉,邬瑞锋,曲乃泗.一类多层偏心结构的地震反应研究[J].地震工程与工程振动,1999,19(4):55-60(Cai Xianhui,Wu Ruifeng,Qu Naisi.Research on seismic response of one type of asymmetrical multistorey buildings[J].Journal of Earthquake Engineering and Engineering Vibration,1999,19(4):55-60(in Chinese))
[7]刘畅.地震作用下偏心结构扭转反应研究[D].长沙:湖南大学,2007(Liu Chang.Study on torsional response of eccentric structures under seismic action[D].Changsha:Hunan University,2007(in Chinese))
[8]王耀伟.平面不规则结构非弹性地震反应规律研究[D].重庆:重庆大学,2003(Wang Yaowei.A study on the inelastic earthquake response of the asymmetric-plan structure[D].Chongqing:Chongqing University,2003(in Chinese))
[9]鲍雷T,普里斯特利M J N.钢筋混凝土和砌体结构的抗震设计[M].北京:中国建筑工业出版社,2002
[10]徐培福,黄吉锋,韦承基.高层建筑结构的扭转反应控制[J].土木工程学报,2006,39(7):1-8(Xu Peifu,Huang Jifeng,Wei Chengji.Control of torsional response of tall building structures[J].China Civil Engineering Journal,2006,39(7):1-8(in Chinese))
[11]徐培福,黄吉锋,韦承基.高层建筑结构在地震作用下的扭转振动效应[J].建筑科学,2000,16(1):1-6(Xu Peifu,Huang Jifeng,Wei Chengji.Response of torsional vibration of tall building structures induced by seismic aaction[J].Building Science,2000,16(1):1-6(in Chinese))
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