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
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摘要
通过野外大比例模型试验,对土-箱形基础-框架结构体系进行动力测试,研究在土-结构相互作用影响下,不同质量分布情况下,结构体系的动力特性变化规律以及其在顶部稳态激振试验中的动力反应;此外,通过有限元软件MSC.Marc建模计算与试验对比分析。研究结果表明:考虑土-结构相互作用影响后,结构的自振频率减小,周期延长;通过堆载改变结构楼层质量分布后,基频减小,结构的动力特性变化规律满足动力相似关系。有限元计算与现场试验吻合较好,为研究如何利用土-结构共同作用指导结构设计提供了参考。
This paper presents the analysis on the dynamic characteristics of soil-structure system in different mass distribution, which based on outdoor large-scale model experiment for soil-box foundation-superstructure system.The dynamic characteristics were also tested in the forced vibration test(FVT) at the superstructure.The FEM(finite element method) software MSC.Marc was used to estabilish a numerical model considering SSI for comparison to real experiment.It presented that the comparisons of results using FEM analysis to the experiment show a good agreement.Considering the SSI,the frequency of motion reduces and the period of motion protracts,the dynamic properties change in rule of relationship of dynamic similitude when the mass distribution changes.So it presents a reference for structure design by the use of characteristics of SSI.
This paper presents the analysis on the dynamic characteristics of soil-structure system in different mass distribution, which based on outdoor large-scale model experiment for soil-box foundation-superstructure system.The dynamic characteristics were also tested in the forced vibration test(FVT) at the superstructure.The FEM(finite element method) software MSC.Marc was used to estabilish a numerical model considering SSI for comparison to real experiment.It presented that the comparisons of results using FEM analysis to the experiment show a good agreement.Considering the SSI,the frequency of motion reduces and the period of motion protracts,the dynamic properties change in rule of relationship of dynamic similitude when the mass distribution changes.So it presents a reference for structure design by the use of characteristics of SSI.
引文
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[8]武芸,尚守平.大比例桩筏框架相互作用体系的地震反应分析[J].山西建筑,2005(31):22-23.WU Yun,SHANG Shou-ping.Seismic response analysis forlarge-scale frame model of pile-raft foundation consideringsoil-pile interaction[J].Shanxi Architecture,2005(31):22-23.
[9]徐礼华,刘祖德,茜平一.上部结构-桩基础-地基相互作用体系地震反应分析[J].岩石力学与工程学报,2002(21):1 720-1 723.XU Li-hua,LIU Zu-de,QIAN Ping-yi.Seismic responses ofthe superstructure-pile founda-tion-soil interaction system[J].Chinese Journal of Rock Mechanics and Engineering,2002(21):1 720-1 723.
[10]尚守平,王海东.钢筋混凝土框架与桩筏基础及地基动力相互作用大比例模型试验[A].第十八届全国高层建筑结构学术会议论文集[C].北京:中国建筑科学研究院,2004:908-913.SHANG Shou-ping,WANG Hai-dong.Experimentation ofreinforced concrete large-scale frame of pile-raft founda-tion considering SSI[A].Dissertation in 18thConference onTall Building Structure[C].Beijing:China Academy ofBuilding Research,2004:908-913.
[2]WU Wen-hua,Smith A.Efficient modal analysis for structurewith soil-structure interaction[J].Earthquake Engineeringand Structural Dynamics,1995,24:283-299.
[3]李辉,赖明,白绍良.土-结构动力相互作用研究综述(Ⅰ)[J].重庆建筑大学学报,1999(4):112-116.LI Hui,LAI Ming,BAI Shao-liang.A summary of researchon soil-structure dynamic interaction(Ⅰ)[J].Journal ofChongqing Architecture University,1999(4):112-116.
[4]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].地震工程与工程震动,2000(4):20-29.LU Xi-lin,CHEN Yue-qing,CHEN Bo,et al.Shaking tabletesting of dynamic soil-structure interaction system[J].Earthquake Engineering and Engineering Vibration,2000(4):20-29.
[5]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(5):71-76.SHANG Shou-ping,ZHU Zhi-hui,TU Wen-ge,et al.Modalexperimental analysis for soil-box foundation-structure dy-namic interaction system[J].Journal of Hunan University,2004(5):71-76.
[6]陈波,吕西林,李培振,等.用ANSYS模拟结构-地基动力相互作用振动台试验的建模方法[J].地震工程与工程震动,2001(1):126-131.CHEN Bo,LU Xi-lin,LI Pei-ji,et al.Modeling of dynamicsoil-structure by ANSYS program[J].Earthquake Engineer-ing and Engineering Vibration,2001(1):126-131.
[7]Clough R,Penzien J.Dynamics of structure[M].Computersand Structures Inc,1995.
[8]武芸,尚守平.大比例桩筏框架相互作用体系的地震反应分析[J].山西建筑,2005(31):22-23.WU Yun,SHANG Shou-ping.Seismic response analysis forlarge-scale frame model of pile-raft foundation consideringsoil-pile interaction[J].Shanxi Architecture,2005(31):22-23.
[9]徐礼华,刘祖德,茜平一.上部结构-桩基础-地基相互作用体系地震反应分析[J].岩石力学与工程学报,2002(21):1 720-1 723.XU Li-hua,LIU Zu-de,QIAN Ping-yi.Seismic responses ofthe superstructure-pile founda-tion-soil interaction system[J].Chinese Journal of Rock Mechanics and Engineering,2002(21):1 720-1 723.
[10]尚守平,王海东.钢筋混凝土框架与桩筏基础及地基动力相互作用大比例模型试验[A].第十八届全国高层建筑结构学术会议论文集[C].北京:中国建筑科学研究院,2004:908-913.SHANG Shou-ping,WANG Hai-dong.Experimentation ofreinforced concrete large-scale frame of pile-raft founda-tion considering SSI[A].Dissertation in 18thConference onTall Building Structure[C].Beijing:China Academy ofBuilding Research,2004:908-913.
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