上部结构与地基相对刚度比对土-结构体系基频影响试验研究
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摘要
本文进行了室内刚性地基上和土槽中1:4钢框架模型的顶部牵引释放试验。对采集的信号进行频谱分析,得到不同刚度时刚性地基上钢框架模型的基频和土槽中土-结构体系的基频。比较钢框架在土槽中的基频和在刚性地基上的基频,发现土-结构动力相互作用(SSI)使土-结构体系基频降低,基频折减率最大为29.37%,且基频折减率与上部结构与地基相对刚度比有关,相对刚度比越大,折减率越大。根据试验结果得出钢框架模型基频折减率随上部结构与地基相对刚度比变化拟合公式。本文试验结果还表明即使在Ⅱ类场地上的结构,当上部结构与地基刚度比较大时有必要考虑土-结构动力相互作用。
Free vibration experiment with initial displacement in a steel frame model on the scale of 1:4 were conducted on the rigid ground and on the soil-trough in door,respectively.After analyzing the spectra of the signals acquired,fundamental frequencies of the steel frame on the rigid ground and on the soil-trough in different stiffness were obtained,respectively.Compared with the fundamental frequencies of the steel frame on the rigid ground,the fundamental frequencies of the steel frame on the soil-trough decrease obviously due to the effect of the soil-structure interaction(SSI).The maximum discount of the fundamental frequencies is 29.37%,and the discount of fundamental frequencies has a close relationship with the relative stiffness ratio of superstructure to ground soil and it increases with the relative stiffness ratio.An expression of the change of the fundamental frequency discount versus the relative stiffness ratio was also obtained by data fitting.The experiment results of the paper also indicate that if the structure is on the classⅡsite and the relative stiffness ratio is large,it is necessary to take SSI into consideration.
Free vibration experiment with initial displacement in a steel frame model on the scale of 1:4 were conducted on the rigid ground and on the soil-trough in door,respectively.After analyzing the spectra of the signals acquired,fundamental frequencies of the steel frame on the rigid ground and on the soil-trough in different stiffness were obtained,respectively.Compared with the fundamental frequencies of the steel frame on the rigid ground,the fundamental frequencies of the steel frame on the soil-trough decrease obviously due to the effect of the soil-structure interaction(SSI).The maximum discount of the fundamental frequencies is 29.37%,and the discount of fundamental frequencies has a close relationship with the relative stiffness ratio of superstructure to ground soil and it increases with the relative stiffness ratio.An expression of the change of the fundamental frequency discount versus the relative stiffness ratio was also obtained by data fitting.The experiment results of the paper also indicate that if the structure is on the classⅡsite and the relative stiffness ratio is large,it is necessary to take SSI into consideration.
引文
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[2]余俊,尚守平,王海东,等.大比例模型稳态激振试验研究[J].湖南大学学报,2006,33(6):11-15.
[3]彭轶君,尚守平,朱志辉,等.有限元模拟土-箱基-框架结构大比例模型动力相互作用研究[J].铁道科学与工程学报,2006,3(1):75-79.
[4]尚守平,朱志辉,涂文戈,等.土-箱形基础-结构动力相互作用的模态试验分析[J].湖南大学学报,2004,31(5):71-76.
[5]吕西林,陈跃庆,陈波,等.结构-地基动力相互作用体系振动台模型试验研究[J].地震工程与工程振动,2000,20(4):20-29.
[6]Wong HL,A comparison of soil-structure interaction calculations with results of full-scale forced vibration tests[J].Soil Dynamics and Earth-quake Engineering,1988,7(1):22-31.
[7]贺志文.土-多层框架相互作用体系动力特性及抗震性能试验研究[D].长沙:湖南大学,2008.
[8]中华人民共和国建设部.GB 50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[9]Wolf J P,Dynamic soil-structure Interaction[M].Englewood Cliffs,New Jersey,Prentice-Hall,Inc,1985:38-50.
[10]王松涛,曹资.现代抗震设计方法[M].北京:中国建筑工业出版社,1997:58-182.
[11]徐建.建筑振动工程手册[M].北京:中国建筑工业出版社,2002:699-716.
[12]杨学山.工程振动测量仪器和测试技术[M].北京:中国计量出版社,2001:175-177.
[13]吕西林,陈跃庆.结构-地基相互作用体系的动力相似关系研究[J].地震工程与工程振动,2001,21(3):85-92.
[14]湖南大学,太原工业大学,福州大学.建筑结构试验[M].北京:中国建筑工业出版社,1991:194-195.
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