悬挂式层状多向剪切模型箱的设计分析及试验验证
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摘要
根据试验目的,运用悬挂隔振和滚珠隔振的理论,设计了悬挂式层状多向剪切模型箱装置。该装置是由钢索吊起的多层圆形框架、悬挂支架和底板组成的空间结构体系。通过对这种新的模型箱结构形式的理论分析,论证了所采用的模型箱结构形式和隔振措施能有效的减少模型箱对模型土振动特性的影响,大大削弱了模型箱自身质量引起的惯性作用对模型土动力响应的影响。通过数值模拟和对试验中模型土加速度时程的对比分析以及模型土的振型分析,论证了在水平地震激励作用下,模型土产生层状剪切变形,且各部分模型土的地震响应一致,能有效模拟土体的侧向变形边界条件。该模型箱既消除了现有柔性模型箱在水平地震激励作用下产生的土体拱效应现象,也克服了现有层状剪切模型箱仅能单向输入水平地震激励的不足。
Based on the target of the test and the theory of vibration isolation,a suspension multidirectional laminar shear model box is developed.This box is a spatial structure system composed of circular frames suspended through steel cables,suspension bracket and motherboard.Theoretical analysis is carried out.The results show that the methodologies of vibration isolation and the structural forms can reduce the effect of the model box on the model soil and the inertia effect caused by the mass of the box itself.The simulated results,the comparison and analysis of the acceleration and the vibration modes of the model soil indicate that the shear deformation is developed in the model soil under horizontal earthquake action and the effect of the box on model soil can be ignored.The suspension multidirectional laminar shear box is very successful in simulating the soil boundary.The arching effect of the model soil can be eliminated.The disadvantage of the existing laminar shear box that earthquake wave only can be input in a single direction can be conquered.
Based on the target of the test and the theory of vibration isolation,a suspension multidirectional laminar shear model box is developed.This box is a spatial structure system composed of circular frames suspended through steel cables,suspension bracket and motherboard.Theoretical analysis is carried out.The results show that the methodologies of vibration isolation and the structural forms can reduce the effect of the model box on the model soil and the inertia effect caused by the mass of the box itself.The simulated results,the comparison and analysis of the acceleration and the vibration modes of the model soil indicate that the shear deformation is developed in the model soil under horizontal earthquake action and the effect of the box on model soil can be ignored.The suspension multidirectional laminar shear box is very successful in simulating the soil boundary.The arching effect of the model soil can be eliminated.The disadvantage of the existing laminar shear box that earthquake wave only can be input in a single direction can be conquered.
引文
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[15]RIEMER M.1-g Modeling of seismic soil-pile-superstru-cture interaction in soft clay[C]//Proc 4th Caltrans SeismicResearch Workshop.Sacramento,1996.
[16]杜修力,李霞,李立云.用于地下结构振动台试验的悬挂式层状多向剪切模型箱装置,中国,201020136580.4[P].1989-07-26.(DU Xiu-li,LI Xia,LI Li-yun.Suspensionmultidirectional laminar shear box used in shaking table test.China,201020136580.4[P].1989-07-26.(in Chinese))
[17]谷音,刘晶波,杜义欣.三维一致黏弹性人工边界及等效黏弹性边界单元[J].工程力学,2007,24(12):31-37.(GU Yin,LIU Jing-bo,DU Yi-xin.3D consistentviscous-spring artificial boundary and viscous-springartificial boundary element[J].Engineering Mechanics,2007,24(12):31-37.(in Chinese))
[2]陈国兴,庄海洋,杜修力,等.土-地铁车站结构动力相互作用的大型振动台模型试验研究[J].地震工程与工程振动,2007,27(2):171-176.(CHEN Guo-xing,ZHUANGHai-yang,DU Xiu-li,et al.Analysis of large-scale shakingtable test of dynamic soil-subway station interaction[J].Earthquake Engineering and Engineering Vibration,2007,27(2):171-176.(in Chinese))
[3]MEYMAND P.Shaking table scale model test of nonlinearsoil-pile-superstructure interaction in soft caly[D].Berkeley:University of California,1998.
[4]陈跃庆,吕西林,李培振,等.分层土-基础-高层框架结构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,2001,21(3):104-112.(CHEN Yao-qing,LüXi-lin,LI Pei-zhen,et al.Shaking table testing for layeredsoil-foundation-structure interaction system[J].EarthquakeEngineering and Engineering Vibration,2001,21(3):104-112.(in Chinese))
[5]WHITMAN R V,LAMBE P C.Effect of boundary conditionsupon centrifuge experiments using ground motion simulation[J].Geotechnical Testing Journal,1986,9:61-71.
[6]MATSUDA T,GOTO Y.Studies on experimental technique ofshaking table test for geotechnical problem[C]//Proceedingsof the 9th World Conference Earthquake Engineering.Tokyo,1998:837-842.
[7]PRASAD S K,TOWHATA I,CHANDRADHARA G P,et al.Shaking table tests in earthquake geotechnical engineering[J].Current Science,2004,87(10):1398-1404.(in Chinese))
[8]伍小平,孙利民,胡世德,等.振动台试验用层状剪切变形土箱的研制[J].同济大学学报,2002,30(7):781-785.(WU Xiao-ping,SUN Li-min,HU Shi-de,et al.Developmentof laminar shear box used in shaking table test[J].Journal ofTongji University,2002,30(7):781-785.(in Chinese))
[9]陈国兴,王志华,左熹,等.振动台试验叠层剪切型土箱的研制[J].岩土工程学报,2010,32(1):89-97.(CHENGuo-xing,WANG Zhi-hua,ZUO Xi,et al.Development oflaminar shear soil container for shaking table tests[J].Chinese Journal of Geotechnical Engineering,2010,32(1):89-97.(in Chinese))
[10]凌贤长,王臣,王志强,等.自由场地基液化大型振动台模型试验研究[J].地震工程与工程振动,2003,23(6):138-143.(LING Xian-zhang,WANG Chen,WANG Zhi-qiang,et al.Study on large-scale shaking table proportional modeltest for free-ground liquefaction arisen from earthquake[J].Earthquake Engineering and Engineering Vibration,2003,23(6):138-143.(in Chinese))
[11]苏栋,李相菘.可液化土中单桩地震响应的离心机试验研究[J].岩土工程学报,2006,28(4):423-427.(SU Dong,LI Xiang-song.Centrifuge investigation on seismic responseof single pile in liquefiable soil[J].Chinese Journal ofGeotechnical Engineering,2006,28(4):423-427.(inChinese))
[12]CHE A L,TAKAHIRO I,GE X R.Study on dynamicresponse of embedded long span corrugated steelculvertsusing scaled model shaking table test and numericalanalyses[J].Journal of Zhejiang University(Science A),2006,6(3):430-435.(in Chinese))
[13]刘光磊.饱和地基中地铁地下结构地震反应机理研究[D].北京:清华大学,2007.(LIU Guang-lei.Research on theseismic response mechanism of underground subwaystructures in saturated foundation[D].Beijing:TsinghuaUniversity,2007.(in Chinese))
[14]史晓军,陈隽,李杰.层状双向剪切模型箱的设计及振动台试验验证[J].地下空间与工程学报,2009,5(2):254-261.(SHI Xiao-jun,CHEN Juan,LI Jie.Design andverification of dua l-direction shear laminar box for shakingtable test[J].Chinese Journal of Underground Space andEngineering,2009,5(2):254-261.(in Chinese))
[15]RIEMER M.1-g Modeling of seismic soil-pile-superstru-cture interaction in soft clay[C]//Proc 4th Caltrans SeismicResearch Workshop.Sacramento,1996.
[16]杜修力,李霞,李立云.用于地下结构振动台试验的悬挂式层状多向剪切模型箱装置,中国,201020136580.4[P].1989-07-26.(DU Xiu-li,LI Xia,LI Li-yun.Suspensionmultidirectional laminar shear box used in shaking table test.China,201020136580.4[P].1989-07-26.(in Chinese))
[17]谷音,刘晶波,杜义欣.三维一致黏弹性人工边界及等效黏弹性边界单元[J].工程力学,2007,24(12):31-37.(GU Yin,LIU Jing-bo,DU Yi-xin.3D consistentviscous-spring artificial boundary and viscous-springartificial boundary element[J].Engineering Mechanics,2007,24(12):31-37.(in Chinese))
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