基于MARC分析的桩基抗拔动力特性研究
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摘要
根据支盘桩-土-框架结构动力相互作用的振动台模型试验,采用分析软件Marc对支盘桩和直杆桩体系的抗震性能进行了研究.结果表明:在地震作用下,建筑物的摇摆使支盘桩承受交替变化的拉压荷载,支盘上部土体中的拉"应力泡"随着结构顶层侧移的增大而不断增大,说明上拔力主要是通过支盘传递的,支盘有效地耗散了部分地震能量,减小了上部结构的摆幅.支盘桩的抗拔力由桩侧摩阻力和支盘阻力组成,随着动荷载的增大,支盘成为传递荷载的主要途径.
In this paper,based on the shaking table tests for the dynamic interaction of squeezed disk pile-soilframe structure,the seismic performances of the squeezed disk pile and the straight pile systems are investigated with MARC software. The results show that squeezed disk piles bear alternating pull and compression loads due to the building swing in an earthquake,which produces pull"stress bubbles"in disk-upper soil that grow with the la teral displacement of the structure top. It is thus concluded that the uplift force is mainly transferred through the disks that effectively dissipate some seismic energies and reduce the swing of the upper structure. Moreover,it is demonstrated that the anti-pulling force of squeezed disk piles derives from the side friction resistance of the pile and the end resistance of the disks,and that,with the increase of dynamic load,the disk becomes the main way to load transfer.
In this paper,based on the shaking table tests for the dynamic interaction of squeezed disk pile-soilframe structure,the seismic performances of the squeezed disk pile and the straight pile systems are investigated with MARC software. The results show that squeezed disk piles bear alternating pull and compression loads due to the building swing in an earthquake,which produces pull"stress bubbles"in disk-upper soil that grow with the la teral displacement of the structure top. It is thus concluded that the uplift force is mainly transferred through the disks that effectively dissipate some seismic energies and reduce the swing of the upper structure. Moreover,it is demonstrated that the anti-pulling force of squeezed disk piles derives from the side friction resistance of the pile and the end resistance of the disks,and that,with the increase of dynamic load,the disk becomes the main way to load transfer.
引文
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[14]国家建设部.GB50011—2001.建筑抗震设计规范[S].2版.北京:中国建筑工业出版社,2008.
[2]韦晓,范立础,王君杰.考虑桩-土-桥梁结构相互作用的振动台试验研究[J].土木工程学报,2002,35(4):91-97.Wei Xiao,Fan Li-chu,Wang Jun-jie.Shaking table test on soil-pile-structure interaction[J].China Civil Enginee-ring Journal,2002,35(4):91-97.
[3]Jun T,Nobuo F,Shigeharu Y.Experimental evaluation of dynamic characteristics of low and medium-rise buildings with soil-structure interaction[C]∥The12th World Con-ference on Earthquake Engineering.Auckland:[s.n.],2000:2244.
[4]楼梦麟,王文剑,马恒春,等.土-桩-结构相互作用体系的振动台模型试验[J].同济大学学报:自然科学版,2001,29(7):763-768.Lou Meng-lin,Wang Wen-jian,Ma Heng-chun,et al.Study on soil-pile-structure interaction system by shakingtable model test[J].Journal of Tongji University:Natural Science,2001,29(7):763-768.
[5]王建华,冯士伦.桩土相互作用的振动台试验[J].岩土工程学报,2004,26(5):616-618.Wang Jian-hua,Feng Shi-lun.The shake table test on soil-pile interaction[J].Chinese Journal of Geotechnical En-gineering,2004,26(5):616-618.
[6]Kagawa T,Sato M,Minowa C,et al.Centrifuge simulations of large-scale shaking table tests:case studies[J].Jour-nal of Geotechnical and Geoenvironmental Engineering,2004,130(7):663-672.
[7]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的研究[J].地震工程与工程振动,2002,22(2):42-48.LüXi-lin,Chen Yue-qing.Study on effect of soil-structure interaction by shaking table test[J].Earthquake Engi-neering and Engineering Vibration,2002,22(2):42-48.
[8]宋二祥,武思宇,王宗纲.地基-结构系统振动台模型试验中相似比的实现问题探讨[J].土木工程学报,2008,41(10):87-92.Song Er-xiang,Wu Si-yu,Wang Zong-gang.A tentative so-lution for similitude realization in shaking table tests of SSI systems[J].China Civil Engineering Journal,2008,41(10):87-92.
[9]Meymand P J.Shaking table scale model tests of nonlinear soil-pile-superstructure interaction in soft clay[D].Berkeley:Univ of California,1998.
[10]陈火红.新编Marc有限元实例教程[M].北京:机械工业出版社,2007.
[11]梁清香.有限元与Marc实现[M].北京:机械工业出版社,2005.
[12]阙前华,常志宇.MSC.Marc工程应用实例分析与二次开发[M].北京:中国水利水电出版社,2005.
[13]史晓军,岳庆霞,李杰.土-结构动力相互作用振动台试验中模型地基影响因素分析[J].建筑科学与工程学报,2007,24(4):50-53.Shi Xiao-jun,Yue Qing-xia,Li Jie.Influence factor ana-lysis of foundation model in shaking table test consider-ing soil-structure dynamic interaction[J].Journal of Ar-chitecture and Civil Engineering,2007,24(4):50-53.
[14]国家建设部.GB50011—2001.建筑抗震设计规范[S].2版.北京:中国建筑工业出版社,2008.
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