高层建筑-地下室-桩-土系统的相互作用
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摘要
针对高层建筑－地下室－桩－土系统的实际情况，将桩土区等效成正交各向异性弹性体，采用乘子型无限元与等参有限元耦合的方法模拟承台－桩－土系统，并根据分枝模态－二步法原理求得上、下部结构之间的惯性耦合项，得到考虑相互作用的修正地震波，作为现有高层建筑结构抗震分析软件的地震输入。根据本文提出的方法，对软土地基上的桩承高层建筑进行实例分析，并对不同土质、不同桩土参数进行了对比分析，为桩承高层建筑的地震反应分析提供一条理论严谨而又方便实用的途径。
Considering the engineering fact of tall building with tall building- basement- base slab- pile- soil system, the following researchs are completed. The pile groups are simulated as orthogonal anisotropic elastic medium. The coupled modelling of multiplier infinite element and isoparametric finite element is introduced to simulate the base slab-pile-soil system. Then according to the principle of dynamic substructure theory, Component Modes-two Steps Method is presented. On the basis of intertia coupling between the superstructure (including basement) and base slab-pile-soil system, the modified earthquake wave, considering interaction effect, can be obtained in the first step of analysis. This wave is used as the earthquake input for the earthquake response analysis of tall building in the second step. The method presented herein opens a strict, convenient and practicable way for the earthquake response analysis of pile- supported tall building with spacious multistoried basements.
Considering the engineering fact of tall building with tall building- basement- base slab- pile- soil system, the following researchs are completed. The pile groups are simulated as orthogonal anisotropic elastic medium. The coupled modelling of multiplier infinite element and isoparametric finite element is introduced to simulate the base slab-pile-soil system. Then according to the principle of dynamic substructure theory, Component Modes-two Steps Method is presented. On the basis of intertia coupling between the superstructure (including basement) and base slab-pile-soil system, the modified earthquake wave, considering interaction effect, can be obtained in the first step of analysis. This wave is used as the earthquake input for the earthquake response analysis of tall building in the second step. The method presented herein opens a strict, convenient and practicable way for the earthquake response analysis of pile- supported tall building with spacious multistoried basements.
引文
1.王文亮,杜作润.结构振动与动态子结构法.复旦大 学出版社,1985.
2.姜忻良,丁学成.桩土物理模型及结构-桩-桩-土相互 作用.振动工程学报.1993.(2).
3.姜忻良,严士超,丁学成.筒体结构-桩-土相互作用 的分枝模态-二步分析法.天津大学学报,1995,(6).
4.赵崇斌等.用无穷元模拟半无限平面弹性地基.清华 大学学报,1986.
5,Bettess,P Infinite Element,Int.J.Num.M eth.Eng. VOl.11,1977.
6.陈素文.高层建筑-地下室-桩-土系统有限元-无 限元耦合模型的分枝模态-二步分析法.天津大学硕 士论文,1997.
7.建筑抗震设计规范(GBJ11-89)及条文说明.
2.姜忻良,丁学成.桩土物理模型及结构-桩-桩-土相互 作用.振动工程学报.1993.(2).
3.姜忻良,严士超,丁学成.筒体结构-桩-土相互作用 的分枝模态-二步分析法.天津大学学报,1995,(6).
4.赵崇斌等.用无穷元模拟半无限平面弹性地基.清华 大学学报,1986.
5,Bettess,P Infinite Element,Int.J.Num.M eth.Eng. VOl.11,1977.
6.陈素文.高层建筑-地下室-桩-土系统有限元-无 限元耦合模型的分枝模态-二步分析法.天津大学硕 士论文,1997.
7.建筑抗震设计规范(GBJ11-89)及条文说明.
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