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[提要]  針對(duì)高層建筑-地下室-樁-土系統(tǒng)的實(shí)際情況，將樁土區(qū)等效成正交各向異性彈性體，采用乘子型無限元與等參有限元耦合的方法模擬承臺(tái)-樁-土系統(tǒng)，并根據(jù)分枝模態(tài)-二步法原理求得上、下部結(jié)構(gòu)之間的慣性耦合項(xiàng)，得到考慮相互作用的修正地震波，作為現(xiàn)有高層建筑結(jié)構(gòu)抗震分析軟件的地震輸入。根據(jù)本文提出的方法，對(duì)軟土地基上的樁承高層建筑進(jìn)行實(shí)例分析，并對(duì)不同土質(zhì)、不同樁土參數(shù)進(jìn)行了對(duì)比分析，為樁承高層建筑的地震反應(yīng)分析提供一條理論嚴(yán)謹(jǐn)而又方便實(shí)用的途徑。
[關(guān)鍵詞]  無限元-有限元耦合 分枝模態(tài)-二步法 高層建筑-樁-土相互作用 地震反應(yīng)

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-sup-ported tall building with spacious multistoried basements.
Keywords: coupling; infinite element; finite element; component modes-two steps method; tall building-pile-soil interaction; earthquake response