平面鋼框架瞬時沖擊去柱抗連續(xù)性倒塌試驗研究
發(fā)布時間:2018-10-08 06:39
【摘要】:采用沖擊去柱法對兩個平面鋼框架進行抗連續(xù)性倒塌試驗研究,重點關(guān)注去柱后框架結(jié)構(gòu)的動力反應(yīng)、倒塌機制以及梁柱受力方式的轉(zhuǎn)變。試驗結(jié)果表明,在整個倒塌過程中,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)歷了彎曲機制抵抗外荷載到懸鏈線機制抵抗外荷載的轉(zhuǎn)變;相鄰框架柱的彎曲剛度越大,對去柱后形成的雙跨梁的約束越強,梁的懸鏈線效應(yīng)就越大。對于強梁弱柱型框架結(jié)構(gòu),由于其框架柱較弱,瞬時去柱后,易發(fā)生柱失穩(wěn)型連續(xù)性倒塌。采用ABAQUS6.11對抗倒塌試驗進行模擬,模擬結(jié)果與試驗結(jié)果吻合較好。結(jié)合試驗結(jié)果,采用有限元模型分析了平面鋼框架倒塌時的動力放大系數(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】: 同濟大學(xué)土木工程學(xué)院;同濟大學(xué)土木工程防災(zāi)國家重點實驗室;愛丁堡大學(xué)工程學(xué)院;
【基金】:國家自然科學(xué)基金重大國際合作研究項目(51120185001)
【分類號】:TU391
[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】: 同濟大學(xué)土木工程學(xué)院;同濟大學(xué)土木工程防災(zāi)國家重點實驗室;愛丁堡大學(xué)工程學(xué)院;
【基金】:國家自然科學(xué)基金重大國際合作研究項目(51120185001)
【分類號】:TU391
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