本文選題：動力作用 + UE本構(gòu)模型　； 參考：《地震工程學報》2014年04期

【摘要】：動力本構(gòu)模型UE模型具有可以描述非對稱循環(huán)荷載、記憶量小、模型參數(shù)物理意義明確、表達式簡單等優(yōu)點。但其描述等幅循環(huán)荷載作用下的土體滯回圈時,存在非對稱性,并且無法較好地擬合土體動阻尼比隨應(yīng)變產(chǎn)生的變化規(guī)律。通過在UE模型的骨架曲線中引入兩個瞬變參數(shù),利用"massing二倍法"構(gòu)造滯回曲線,使模型同時滿足各個應(yīng)變下的剪切模量及阻尼比,確定瞬變參數(shù)的表達式,將瞬變參數(shù)表達式帶入滯回曲線方程中,即得到最終的滯回曲線表達式,并定義各個滯回圈頂點的連線為此修正模型的實際骨架曲線。分析結(jié)果表明,該修正模型能夠克服UE模型存在的不足,且更符合實際。
[Abstract]:The dynamic constitutive model UE model has the advantages of describing asymmetric cyclic load, small memory, clear physical meaning of model parameters, simple expression and so on.However, when describing the hysteresis loop of soil under constant amplitude cyclic load, there is asymmetry, and the variation of dynamic damping ratio of soil with strain can not be fitted well.By introducing two transient parameters into the skeleton curve of the UE model, the hysteretic curve is constructed by using the "massing double method". The model satisfies the shear modulus and damping ratio of each strain at the same time, and the expression of the transient parameter is determined.The transient parameter expression is introduced into the hysteretic curve equation, that is, the final hysteretic curve expression is obtained, and the line of each hysteretic loop vertex is defined to modify the actual skeleton curve of the model.The results show that the modified model can overcome the shortcomings of UE model and is more practical.
【作者單位】： 中國地震局工程力學研究所;防災(zāi)科技學院;
【基金】：中國地震局工程力學研究所基本科研業(yè)務(wù)費專項(2013C02) 黑龍江省科學基金(QC2012C105) 國家自然科學基金項目(50978237)
【分類號】：TU435
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本文編號：1759782