空间结构抗震分析中的地震波选取与阻尼比取值
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摘要
针对当今空间结构抗震分析中地震波选取及阻尼比取值可能遇到的问题进行了讨论.首先说明了正确选择地震波的重要性,指出选择地震波时应同时符合地震动三要素,尤其要慎重考虑地震动的谱特征,否则将使抗震计算偏于不安全,为此论文给出正确选择与调整地震波的具体方法与步骤。继而在介绍阻尼理论的基础上,详细列出了国内外钢结构、空间网格结构与索结构的阻尼比实测与试验值.经分析研究,本文对空间网格结构与索结构的阻尼比分别给出了取值建议.对于由不同单元不同材料组合的结构或考虑混凝土支承体系影响的空间结构的阻尼比值,可采用阻尼比值简化计算公式.
Selection of earthquake waves and values of damping ratio for space structures in aseismic analysis are discussed in this paper.Firstly,the importance of the selection of earthquake waves is narrated.Three essential factors of ground motion must be considered simultaneously,in which the characteristics of acceleration spectrum of ground motion is most important.Otherwise,the calculation results will be unsafe for the wrong earthquake waves selected.So the methods to select and adjust the reasonable seismic waves are given in this paper.Then on the basis of damping theory,the values of damping ratio of steel and spatial structures from experiments or testing to practical structures all over the world are illustrated,and the values of damping ratio for spatial latticed structures and cable structures taken in aseismic design are suggested.For structures composed of different materials or spatial steel latticed structures with concrete supporting systems,a practical formula of damping ratio can be used.
Selection of earthquake waves and values of damping ratio for space structures in aseismic analysis are discussed in this paper.Firstly,the importance of the selection of earthquake waves is narrated.Three essential factors of ground motion must be considered simultaneously,in which the characteristics of acceleration spectrum of ground motion is most important.Otherwise,the calculation results will be unsafe for the wrong earthquake waves selected.So the methods to select and adjust the reasonable seismic waves are given in this paper.Then on the basis of damping theory,the values of damping ratio of steel and spatial structures from experiments or testing to practical structures all over the world are illustrated,and the values of damping ratio for spatial latticed structures and cable structures taken in aseismic design are suggested.For structures composed of different materials or spatial steel latticed structures with concrete supporting systems,a practical formula of damping ratio can be used.
引文
[1]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社.2005.
[2]SATAKE Naoki,et al.Damping evalution using full-scale data of buildings in Japan[J].Journal of StructuralEngineering,ASCE,2003,129(4):470-477.
[3]黄本才.高层建筑结构振动阻尼比测试与分析[J].结构工程师,1997,(4):20-24.HUANG Ben-cai.Measurement and analysis of the val-ues of damping ratios for tall building structures.Struc-tural Engineers[J].1997,(4):20-24.
[4]韩庆华,裴波,王成博,等.预应力组合网架结构的自振特性分析及现场测试[J].地震工程与工程振动,2004,24(2):118-124.HAN Qing-hua,FEI Bo,WANG Cheng-bo,et al.Anal-ysis of free viabration charecteristic and testing to a pres-tressed composed space truss structure[J].EarthquakeEngineering and Engineering Vibration,2004,24(2):118-124.
[5]龚炳年,郝锐坤,赵宁.钢-混凝土混合结构模型动力特性的试验研究[J].建筑结构学报,1995,16(3):37-43.GONG Bing-nian,HAO Rui-kun,ZHAO Ning.An ex-peri mental study of dynamic charecteristic for steel-con-crete composed structure[J].Journal of Building Struc-tures,1995,16(3):37-43.
[6]曹资,薛素铎,张毅刚.空间网格结构动力分析中阻尼问题综述与展望[A].第十一届空间结构学术会议论文集[C],2005∶143-148.
[2]SATAKE Naoki,et al.Damping evalution using full-scale data of buildings in Japan[J].Journal of StructuralEngineering,ASCE,2003,129(4):470-477.
[3]黄本才.高层建筑结构振动阻尼比测试与分析[J].结构工程师,1997,(4):20-24.HUANG Ben-cai.Measurement and analysis of the val-ues of damping ratios for tall building structures.Struc-tural Engineers[J].1997,(4):20-24.
[4]韩庆华,裴波,王成博,等.预应力组合网架结构的自振特性分析及现场测试[J].地震工程与工程振动,2004,24(2):118-124.HAN Qing-hua,FEI Bo,WANG Cheng-bo,et al.Anal-ysis of free viabration charecteristic and testing to a pres-tressed composed space truss structure[J].EarthquakeEngineering and Engineering Vibration,2004,24(2):118-124.
[5]龚炳年,郝锐坤,赵宁.钢-混凝土混合结构模型动力特性的试验研究[J].建筑结构学报,1995,16(3):37-43.GONG Bing-nian,HAO Rui-kun,ZHAO Ning.An ex-peri mental study of dynamic charecteristic for steel-con-crete composed structure[J].Journal of Building Struc-tures,1995,16(3):37-43.
[6]曹资,薛素铎,张毅刚.空间网格结构动力分析中阻尼问题综述与展望[A].第十一届空间结构学术会议论文集[C],2005∶143-148.
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