【摘要】：采用沖擊去柱法對(duì)兩個(gè)平面鋼框架進(jìn)行抗連續(xù)性倒塌試驗(yàn)研究,重點(diǎn)關(guān)注去柱后框架結(jié)構(gòu)的動(dòng)力反應(yīng)、倒塌機(jī)制以及梁柱受力方式的轉(zhuǎn)變。試驗(yàn)結(jié)果表明,在整個(gè)倒塌過程中,框架結(jié)構(gòu)經(jīng)歷了彈性受力階段-彈塑性受力階段-懸鏈線形成階段;框架梁經(jīng)歷了彎曲機(jī)制抵抗外荷載到懸鏈線機(jī)制抵抗外荷載的轉(zhuǎn)變;相鄰框架柱的彎曲剛度越大,對(duì)去柱后形成的雙跨梁的約束越強(qiáng),梁的懸鏈線效應(yīng)就越大。對(duì)于強(qiáng)梁弱柱型框架結(jié)構(gòu),由于其框架柱較弱,瞬時(shí)去柱后,易發(fā)生柱失穩(wěn)型連續(xù)性倒塌。采用ABAQUS6.11對(duì)抗倒塌試驗(yàn)進(jìn)行模擬,模擬結(jié)果與試驗(yàn)結(jié)果吻合較好。結(jié)合試驗(yàn)結(jié)果,采用有限元模型分析了平面鋼框架倒塌時(shí)的動(dòng)力放大系數(shù)和最終倒塌模態(tài)。
[Abstract]:The continuous collapse resistance of two plane steel frames was studied by impact de-column method, focusing on the dynamic response of frame structure after column removal, collapse mechanism and the transformation of Liang Zhu's stress mode. The experimental results show that, during the whole collapse process, the frame structure has experienced the elastic stress stage, the elastic-plastic stress stage and the catenary forming stage, and the frame beam has experienced the transformation from bending mechanism to catenary mechanism to resisting the external load. The stronger the bending stiffness of adjacent frame columns is, the stronger the constraint on the two-span beams formed after column removal is, and the greater the catenary effect of beams is. For the frame structure with strong beam and weak column, because of its weak frame column, it is easy to occur the continuous collapse of column instability after instantaneous column removal. The simulation results of ABAQUS6.11 anti-collapse test are in good agreement with the experimental results. Based on the experimental results, the dynamic magnification factor and ultimate collapse mode of plane steel frame are analyzed by finite element model.
【作者單位】： 同濟(jì)大學(xué)土木工程學(xué)院;同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室;愛丁堡大學(xué)工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金重大國(guó)際合作研究項(xiàng)目(51120185001)
【分類號(hào)】：TU391

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