土-筏基钢框架结构动力相互作用试验研究
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摘要
为了解土-结构动力相互作用,分别在土槽和刚性地基上进行大比例筏板基础-钢框架顶层低频激振,通过改变上部结构刚度而进行了4个工况的试验对比,对采集的信号进行频谱分析和时域分析,得到不同工况下刚框架频率和动力反应,发现土体对结构频率与动力反应的关系呈现出一定的规律,这种规律主要是由上部结构的刚度变化引起的.土槽中的结构比刚性地基结构自振频率有所折减,随着上部结构刚度的增加土槽中的结构自振频率折减增多,试验最大值可达21.63%.结构各层柱的最大剪力、各楼层加速度峰值及位移峰值有明显的变化规律,加速度折减可达30%以上.
In order to understand soil-structure dynamic interaction,tests were done about low frequency vibration exciting a large proportion of raft-foundation-steel frame in trough and on rigid foundation.Changing the stiffness of the superstructure,four contrast tests were conducted.By signal spectrum and time domain analysis,the frequency and dynamic responses of the steel frame were obtained,and it was found that the frequency and dynamic responses had something to do with the soil,which were mainly caused by the change of superstructure stiffness.The natural vibration frequency of structure reduced in trough compared with that on rigid foundation.As the superstructure stiffness increased,the reduction coefficient of frequency increased,which in the test was up to 21.63%.Also,the maximum shear force for columns,peak acceleration and displacement of each floor had obvious variation,and the reduction coefficient of acceleration could be up to 30%.
In order to understand soil-structure dynamic interaction,tests were done about low frequency vibration exciting a large proportion of raft-foundation-steel frame in trough and on rigid foundation.Changing the stiffness of the superstructure,four contrast tests were conducted.By signal spectrum and time domain analysis,the frequency and dynamic responses of the steel frame were obtained,and it was found that the frequency and dynamic responses had something to do with the soil,which were mainly caused by the change of superstructure stiffness.The natural vibration frequency of structure reduced in trough compared with that on rigid foundation.As the superstructure stiffness increased,the reduction coefficient of frequency increased,which in the test was up to 21.63%.Also,the maximum shear force for columns,peak acceleration and displacement of each floor had obvious variation,and the reduction coefficient of acceleration could be up to 30%.
引文
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[4]熊伟.基于SSI及非线性土体反应的新型分布式隔震系统研究[D].长沙:湖南大学土木工程学院,2009.XIONG Wei.Research on an innovative distributed seismicisolation system based on SSI and nonlinear soil response[D].Changsha:Hunan University,College of Civil Engineering,2009.(In Chinese)
[5]尚守平,周福霖,结构抗震设计[M].2版.北京:高等教育出版社,2010:43-46.SHANG Shou-ping,ZHOU Fu-lin.Structural seismic design[M].2nd ed.Beijing:Higher Education Press,2010:43-46.(In Chinese)
[6]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.LV Xi-lin,CHEN Yue-qing,CHEN Bo,et al.Shaking tabletesting of dynamic soil-structure interaction system[J].Jour-nal of Earthquake Engineering and Engineering Vibration,2000,20(4):20-29.(In Chinese)
[7]尚守平,贺志文,王海东,等.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[J].地震工程与工程振动,2008,28(5):94-101.SHANG Shou-ping,HE Zhi-wen,WANG Hai-dong,et al.Experimental investigation on the effect of the relative stiffnessratio between super-structure and ground soil on the funda-mental frequency of soil-structure system[J].Journal ofEarthquake Engineering and Engineering Vibration,2008,28(5):94-101.(In Chinese)
[8]WANG H L.A comparison of soil-structure action calcula-tions with results of full-scaleorced vibration tests[J].Soil Dy-namics and Earthquake Engineering,1988,7(1):22-31.
[9]吕西林,蒋欢军.建筑结构抗震研究的若干进展[J].同济大学学报:自然科学版,2004,32(10):1278-1284.LV Xi-lin,JIANG Huan-jun.Progress of seismic research inthe field of building structural engineering[J].Journal ofTongji University:Natural Science,2004,32(10):1278-1284.(In Chinese)
[10]文学章,尚守平.剪切波作用下桩筏基础的动力响应研究[J].湖南大学学报:自然科学版,2012,39(8):14-18.WEN Xue-zhang,SHANG Shou-ping.Kinematic response ofpile-raft foundation to vertical S-wave seismic excitation[J].Journal of Hunan University:Natural Sciences,2012,39(8):14-18.(In Chinese)
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