不同底面积与埋深的结构-土体系地震反应分析
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摘要
对结构-土相互作用体系中结构基础底面积和结构基础埋深对体系地震反应的影响进行了研究。基于有限元分析方法建立了结构-土相互作用三维计算模型,通过改变结构底面积及基础埋深在不同地震动下进行了地震反应分析。结果表明,考虑相互作用时,在同一种地震动作用下,结构顶层总位移及基础转动随着结构底面积的增大而明显减小,上部结构本身位移在总位移中所占比例随着底面积的增加而增大;底面积相同,结构顶层总位移及基础转动均随着埋置深度的增大而减小,上部结构本身位移在总位移中所占比例随着埋置深度的增加而增大。比较不同特性的地震动,不同底面积及埋深结构顶层总位移、基础转动、基础平动和结构自身位移的变化规律趋势相同。
The influence of the change of structure base areas and depths of foundation on seismic responses was studied for the structure-soil interaction system.Based on the finite element method,the structure-soil interaction three-dimensional calculation model was established.We analyzed the seismic response by changing the structure base areas and depths of foundation and choosing different earthquake ground motions.The results considering structure-soil interaction show that,under the same earthquake ground motions,the total displacement on the top floor of the structure and the foundation rotation displacement decrease with the increase of structure base area.The proportion of superstructure displacement due to self-deformatlon to total displacement increases with the increase of structure base area.The top displacement and the foundational rotational displacement decrease with the increase of depth of foundation for the structure with the same base area,and the proportion of superstructure displacement due to self-deformation to the total displacement increases with the increase of depth of foundation.Comparing the results under different seismic ground motions,the changes of foundation rotational displacement,foundation horizontal translation and superstructure displacement due to self-deformation show the same trend.
The influence of the change of structure base areas and depths of foundation on seismic responses was studied for the structure-soil interaction system.Based on the finite element method,the structure-soil interaction three-dimensional calculation model was established.We analyzed the seismic response by changing the structure base areas and depths of foundation and choosing different earthquake ground motions.The results considering structure-soil interaction show that,under the same earthquake ground motions,the total displacement on the top floor of the structure and the foundation rotation displacement decrease with the increase of structure base area.The proportion of superstructure displacement due to self-deformatlon to total displacement increases with the increase of structure base area.The top displacement and the foundational rotational displacement decrease with the increase of depth of foundation for the structure with the same base area,and the proportion of superstructure displacement due to self-deformation to the total displacement increases with the increase of depth of foundation.Comparing the results under different seismic ground motions,the changes of foundation rotational displacement,foundation horizontal translation and superstructure displacement due to self-deformation show the same trend.
引文
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[2]Inabaa T,Dohia H,Okutaa K,et al.Nonlinear response of surface soil and NTT building due to soil-structure interaction during the 1995 Hyogo-ken Nanbu(Kobe)earthquake[J].Soil Dynamics and Earthquake Engineering,2000,20:289-300.
[3]于旭,陈亚东.考虑SSI效应的隔震结构体系振动台模型试验与数值模拟对比研究[J].世界地震工程,2011,27(2):100-106.YU Xu,CHEN Yadong.Comparison between shaking table test results and numerical simulation of isolated structure system considering SSI[J].World Earthquake Engineering,2011,27(2):100-106.(in Chinese)
[4]门玉明,黄义.土-结构动力相互作用问题的研究现状及展望[J].力学与实践,2000,22(4):1-7.MEN Yuming,HUANG Yi.A review on dynamic soil-structure interaction research[J].Mechanics In Engineering,2000,22(4):1-7.(in Chi-nese)
[5]林瑾,盛宏玉.高层框架剪力墙结构与桩-土共同作用的时程响应分析[J].合肥工业大学学报:自然科学版,2006,29(8):1013-1017.LIN Jin,SHENG Hongyu.Time history response analysis of cooperative effects of the tall frame-shear wall structure-piles system[J].Journal ofHefei University of Technology,2006,29(8):1013-1017.(in Chinese)
[6]Caia Y X,Gouldb P L,Desaic C S.Nonlinear analysis of 3D seismic interaction of soil-pile-structure systems and application[J].EngineeringStructures,2000,22:191-199.
[7]Raychowdhury P.Seismic response of low-rise steel moment-resisting frame(SMRF)buildings incorporating nonlinear soil-structure interaction[J].Engineering Structures,2011,33(3):958-967.
[8]Lysmer J,Kulemeyer R L.Finite dynamic model for infinite Media[J].J.Eng.Mech.Div.,ASCE,1969,95:759-877.
[9]关慧敏,廖振鹏.局部人工边界稳定性的一种分析方法[J].力学学报,1996,28(3):376-380.GUAN Huimin,LIAO Zhenpeng.A method for the stability analysis of local artificial boundaries[J].Chinese Journal of Theoretical and AppliedMechanics,1996,28(3):376-380.(in Chinese)
[10]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.LOU Menglin,WANG Wenjian,ZHU Tong,et al.Soil lateral boundary effect in shaking table model test of soil-structure system[J].Journal ofEarthquake Engineering and Engineering Vibration,2000,20(4):30-36.(in Chinese)
[11]陈跃庆,吕西林,黄炜.结构–地基相互作用振动台试验中土体边界条件的模拟方法[J].结构工程师,2000(3):20-30.CHEN Yueqing,LU Xilin,HUANG Wei.Simulation method of soil boundary condition in shaking table tests of soil-structure interaction[J].Struc-tural Engineers,2000(3):20–30.(in Chinese)
[12]张宇旭,程磊,叶红.基于ANSYS的三维自由场地震动反应分析[J].四川建筑科学研究,2012,38(3):216-220.ZHANG Yuxu,CHENG Lei,YE Hong.Seismic response analysis of three-dimensional free field based on ANSYS[J].Sichuan Building Science,2012,38(3):216-220.(in Chinese)
[13]Craig R R,Kurdila A J.结构动力学[M].王光远译.北京:高等教育出版社,2006.Roy R.Craig,Andrew J.Kurdila.Fundamentals of Structural Dynamics[M].WANG Guangyuan.Beijing:Academic Publishing,2006.
[14]楼梦麟.结构动力分析的子结构方法[M].上海,同济大学出版社,1997.LOU Menglin.Substructure methods of structure dynamic analysis[M].Shanghai:Tongji University Press,1997.(in Chinese)
[15]Craig R R Jr,Chang C J.A review of substructure coupling methods for dynamic analysis[J].Advances in Engineering Science,1976,2:393-408.
[16]夏栋舟,何益斌,基础条件对SSDI体系动力特性的影响[J].中南大学学报:自然科学版,2012,43(7):2775-2781.XIA Dongzhou1,HE Yibin.Influence of dynamic behaviors for SSDI system based on different foundation conditions[J].Journal of Central SouthUniversity:Science and Technology,2012,43(7):2775-2781.(in Chinese)
[17]林皋.土-结构动力相互作用[J].世界地震工程,1991,1:4-21.LIN Gao.Soil-structure dynamic interaction[J].World Earthquake Engineering,1991,1:4-21.(in Chinese)
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