| 熊辉,吕西林,黄靓.考虑土-结构相互作用效应的三维桩基结构动力有限元分析[J].计算力学学报,2007,24(6):756~762 |
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| 考虑土-结构相互作用效应的三维桩基结构动力有限元分析 |
| A dynamic FE analysis considering the SSI effect on 3D pile-supported structures |
| 投稿时间：2005-05-25 修订日期：2006-03-06 |
| DOI：10.7511/jslx20076148 |
| 中文关键词: 群桩效应,三维群桩-分层土-上部结构相互作用,刚体、惯性相互作用,整体有限元计算,动力反应 |
| 英文关键词:pile-group effect,3D Pile-Group-Soil-Structure(PGSS) interaction,kinematic and inertial interaction,a whole FE computation,dynamic response |
| 基金项目:国家自然科学基金(50278033)，教育部科学技术研究重点项目(03122)资助项目 |
| 熊辉 吕西林 黄靓 |
湖南大学土木工程学院 长沙410082(熊辉，黄靓)
，同济大学结构工程与防灾研究所 上海200092(吕西林)
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| 摘要点击次数: 1983 |
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| 中文摘要: |
| 结合简化阻抗法建立了三维相互作用结构的动力有限元分析模型,导出了考虑群桩刚体、惯性效应作用时的结构相互作用时程积分方程式,以近乎纯结构有限元的建模途径合理地反映出桩-土-上部结构在水平地震作用下的动力相互作用特性。模型中引入具有桩(筏)-土阻抗特性的弹阻单元来描述不同群桩布置、土层状况因素对体系反应的参与作用,而在动力方程中竖向SV剪切波经桩土刚体相互作用产生的水平、摇摆分量对体系的影响亦得以体现。20层桩承刚框架结构的动力分析表明:较柔的桩、土基础使得体系的SSI效应增强,但其参与程度与群桩效应相关,而结构构件内力较不考虑相互作用时有较大折减;应用该法可精确、快速地进行复杂上、下部结构时程反应分析。 |
| 英文摘要: |
| A dynamic FE 3D structural interaction model and the corresponding time-history equation considering kinematic interaction,inertail interaction of pile-groups are presented with the combination of simplified impedance method.The dynamic characteristics of pile-soil-structures under horizontal seismic loads are rationally reflected by means of similar pure structural finite-element approach.The participation effect on system response of different pile collocation,soil condition is described with spring-dashpot elements characterized by pile-group/raft dynamic impedance in the model.The sway-rocking input components of shear s-wave of pile-group kinematic interaction are also introduced to dynamic equilibrium equation.With the analysis for a pile-supported 20-storey steel frame,it is indicated that the SSI effect would increase with the decrease of pile/soil foundation stiffness depending on pile-group dynamic effect and the internal forces of structural,members under SSI would reduce greatly relative to fixed-base condition.The time-history response for the complicated PGSS will be accurately and quickly developed by this model. |
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