软土-桩-结构动力相互作用振动台模型试验研究
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摘要
目的分析探讨软土-桩-结构动力相互作用的机理.方法通过软土-桩-结构相互作用体系和刚性地基上建筑结构两个振动台模型试验,研究了相互作用对结构的动力特性和地震反应的影响.结果通过振动台试验得到了软土-桩-结构相互作用体系和刚性地基上结构体系的自振周期、阻尼比、加速度反应和位移反应曲线等.结论结果表明,软土-桩-结构动力相互作用对结构的动力特性和地震反应有较大的影响:建筑结构自振频率减小,阻尼增大;在地震作用下,考虑相互作用的结构加速度、位移较基础固定的结构大.
In order to study the mechanism of Soil-Structure interaction by comparing the shaking table model test results of dynamic interaction system of soil and high structure with those of high structure on fixed base,the effects of Soil-Structure interaction(SSI)on dynamic characteristics and seismic responses are studied in this paper.Due to the effect of SSI,the natural frequency of the system in soft conditions is lower than that of structure on the fixed base and its damping ratio is higher than that of structure.When SSI is taken into consideration,the seismic responses such as acceleration and displacement are commonly lager than those of the structure on the fixed base.
In order to study the mechanism of Soil-Structure interaction by comparing the shaking table model test results of dynamic interaction system of soil and high structure with those of high structure on fixed base,the effects of Soil-Structure interaction(SSI)on dynamic characteristics and seismic responses are studied in this paper.Due to the effect of SSI,the natural frequency of the system in soft conditions is lower than that of structure on the fixed base and its damping ratio is higher than that of structure.When SSI is taken into consideration,the seismic responses such as acceleration and displacement are commonly lager than those of the structure on the fixed base.
引文
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[2]Tobia J.Experiment evaluation of dynamic character-istics of low and medium-rise building with soil-structure interaction[C],Proc.12WCEE,2000.
[3]吕西林,陈跃庆.高层建筑结构-地基动力相互作用效果的振动台试验对比研究[J].地震工程与工程振动,2002,22(2):42-48.
[4]Yazdchi M.Dynamic Soil-Structure Interaction Analy-sis via Coupled Finite-Element Boundary ElementMethod[J].Soil Dynamic and Earthquake Engineer-ing,1999,18(3):499-517.
[5]Anagnostopoulos S A.Pile Foundation Modeling forInelastic Earthquake Analyses of Large Structures[J].Engineering Structures,1983(2):15-22.
[6]Liao Z P,Wong H L.A Transmitting Boundary forthe Numerical Simulation of Elastic Wave Propaga-tion[J].Soil Dynamic and Earthquake Engineering,1984(3):174-183.
[7]陈跃庆.结构-地基动力相互作用体系振动台试验研究[D].上海:同济大学土木工程学院,2001.
[8]楼梦麟,王文剑,朱彤,等.土-结构体系振动台模型试验中土层边界影响问题[J].地震工程与工程振动,2000,20(4):30-36.
[9]陈鑫,赵成文,赵乃志.不同肢长异型柱框架结构弹塑性时程分析[J].沈阳建筑大学学报(自然科学版),2004,20(4):287-291.
[10]张令弥.振动测试与动态分析[M].北京:航空工业出版社,1992.
[11]H.霍斯多夫.结构模型分析[M].徐政忠,陈安息,曾盛奎译.北京:中国建筑工业出版社,1986.
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