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[提要]  本文采用有限元-邊界元耦合方法，對(duì)高層建筑與地基基礎(chǔ)的聯(lián)合作用進(jìn)行了考慮材料非線性的分析。地基部分用二次曲線等參邊界單元來模擬；上部結(jié)構(gòu)中的混凝土及受拉主鋼筋分別用八節(jié)點(diǎn)等參單元和二節(jié)點(diǎn)線形單元來模擬；而混凝土與鋼筋之間的粘結(jié)-滑移關(guān)系則用四邊形聯(lián)結(jié)單元來模擬。根據(jù)兩部分接觸面上位移協(xié)調(diào)和力的平衡條件，將FEM和BF'M進(jìn)行耦合。用FORTRAN77語(yǔ)言編制了計(jì)算機(jī)程序，并在COMPAQ386/20e計(jì)算機(jī)上進(jìn)行了實(shí)例計(jì)算，結(jié)果令人滿意。該方法充分發(fā)揮了有限元在非線性分析中的優(yōu)勢(shì)和邊界元在半無限域應(yīng)用中的優(yōu)勢(shì)，較之單一的有限元法，具有數(shù)據(jù)準(zhǔn)備簡(jiǎn)單，機(jī)時(shí)耗費(fèi)量和內(nèi)存需求量少，計(jì)算精度高的優(yōu)點(diǎn)。
[關(guān)鍵詞]  高層建筑 地基土-結(jié)構(gòu) 聯(lián)合作用  非線性分析 有限元-邊界元耦合法

The FEM-BEM coupled method has been used to analyse tall building-foundation-soil interaction taking material nonlinear properties into account. Quadratic curve isoparametric boundary elements model soil, eight-nodes isoparametric finite elements were used for concrete or reinforced concrete in beams and columns, bar elements with two nodes were used for steel reinforcements, quadrilateral link elements were used to model the bonding and slipping conditions between steel line and concrete in beams and columns. According to the conditions of displacement compatibility and force equilibrium on the interface, the FEM and the BEM were coupled. The results of calculation is satisfying. Compared with single FEM,  it has the advantages of the covenient preparation of data and the high precision of calculation.
Keywords: tall  building; interaction; nonlinear analysis; FEM-BEM coupled method; foundation