本文關(guān)鍵詞：鋼柱抗爆響應(yīng)分析單自由度模型適用性評(píng)估　出處：《爆炸與沖擊》2017年05期 　論文類型：期刊論文

  更多相關(guān)文章： 爆炸荷載 鋼柱 等效單自由度模型 有限元 應(yīng)變率

【摘要】：為評(píng)估單自由度(SDOF)模型在結(jié)構(gòu)抗爆設(shè)計(jì)中的適用性,分別采用SDOF模型和通用有限元軟件ANSYS/LS-DYNA對(duì)簡(jiǎn)支鋼柱承受爆炸荷載時(shí)的動(dòng)力響應(yīng)進(jìn)行模擬;對(duì)比二者計(jì)算結(jié)果,并以有限元模擬為準(zhǔn),分析SDOF模型的適用范圍。研究表明:可按照自由振動(dòng)階段SDOF模型位移結(jié)果的振幅大小,將其位移響應(yīng)劃分為有限變形階段、臨界階段、失穩(wěn)破壞階段,有限變形階段SDOF模型與有限元結(jié)果基本一致;截面高寬比、翼緣寬厚比對(duì)鋼柱動(dòng)力破壞形式有重要影響,高寬比越大、翼緣的寬厚比越小,越容易發(fā)生平面外彎扭失穩(wěn);在SDOF模型中通過假定塑性鉸分布長(zhǎng)度計(jì)算塑性階段應(yīng)變及應(yīng)變率,采用隨時(shí)間變化的應(yīng)變率計(jì)算Cowper-Symonds本構(gòu)關(guān)系中的應(yīng)力放大系數(shù)是可行的。
[Abstract]:In order to evaluate the single degree of freedom (SDOF) model is in the structure of antiknock design, were used to simulate the dynamic response of simply supported steel column under blast loading SDOF model and ANSYS/LS-DYNA finite element software; the calculation results of the two, and by the finite element simulation is accurate, the scope of the SDOF model. Show that in accordance with the amplitude of displacement results of free vibration phase of the SDOF model, the displacement response is divided into finite deformation stage, critical stage, failure stage, finite deformation stage SDOF model and finite element results; cross-section aspect ratio, flange width thickness ratio of steel column power failure mode has important effect, high the greater the width ratio, flange width to thickness ratio is smaller, the more prone to out of plane flexural torsional buckling; in the SDOF model by assuming that the calculation of plastic strain and strain rate during the length of plastic hinge distribution, using the time variable It is feasible to calculate the stress magnification coefficient in the constitutive relation of Cowper-Symonds.

【作者單位】： 山東建筑大學(xué)土木工程學(xué)院;山東軍之星建筑設(shè)計(jì)有限公司;
【基金】：國家自然科學(xué)基金項(xiàng)目(11272189)
【分類號(hào)】：O34
【正文快照】： 由于爆炸荷載傳播速度快、峰值壓力大、作用時(shí)間短,因此難以精確描述所引起的動(dòng)力響應(yīng)。為了方便結(jié)構(gòu)抗爆工程應(yīng)用,理想的方法是提出一些簡(jiǎn)化的分析模型,等效單自由度(single degree of free-dom model,SDOF)模型就是其中之一。GB 50009-2012《建筑結(jié)構(gòu)荷載規(guī)范》中規(guī)定:由炸

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1 汪維;張舵;盧芳云;王松川;湯福靜;;基于實(shí)驗(yàn)和等效單自由度模型的方形鋼筋混凝土板抗爆性能研究[A];第十屆全國沖擊動(dòng)力學(xué)學(xué)術(shù)會(huì)議論文摘要集[C];2011年

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本文編號(hào)：1418035