【摘要】：Bouc-Wen光滑滯回模型因其能夠描述動力荷載下的復(fù)雜非線性,廣泛應(yīng)用于材料的動力分析。為研究筑壩料在循環(huán)加載條件下動剪切模量和阻尼比以及累積變形等復(fù)雜動力特性,將Bouc-Wen模型應(yīng)用于土體,繪制應(yīng)力應(yīng)變滯回圈并分析其模型參數(shù);采用參數(shù)敏感性分析方法研究Bouc-Wen模型,并對動力試驗數(shù)據(jù)進(jìn)行數(shù)值模擬;討論模型參數(shù)變化對土體應(yīng)力應(yīng)變滯回圈及動剪模量和阻尼比的影響。根據(jù)國內(nèi)外筑壩料動力試驗數(shù)據(jù)統(tǒng)計得到筑壩料模量衰減及阻尼比增長的均值曲線,應(yīng)用MATLAB軟件編制遺傳算法程序確定模型參數(shù);利用GDS動三軸儀探究糯扎渡土石壩的心墻摻礫土在循環(huán)荷載下的累積變形特性,并應(yīng)用Bouc-Wen模型對循環(huán)三軸試驗測得的應(yīng)力應(yīng)變滯回圈進(jìn)行數(shù)值模擬�；趨�(shù)分析和數(shù)值擬合結(jié)果,本文提出適用于筑壩料的Bouc-Wen模型參數(shù)范圍;筑壩料動剪模量衰減曲線和阻尼比增長曲線擬合結(jié)果均方誤差小于0.4%;糯扎渡摻礫土循環(huán)三軸試驗8個振動周期累積應(yīng)變試驗值與模型預(yù)測值分別為1.2%和1.18%�；诒疚难芯康玫降哪Ｐ蛥�(shù)范圍,Bouc-Wen模型可以有效地模擬筑壩料動模量阻尼和累積變形特性,為筑壩料動力分析提供幫助。
[Abstract]:The Bouc-Wen smooth hysteretic model is widely used in the dynamic analysis of materials because of its ability to describe the complex nonlinearity under dynamic loads. In order to study the complex dynamic characteristics of damming materials under cyclic loading, such as dynamic shear modulus, damping ratio and cumulative deformation, the Bouc-Wen model is applied to soil mass, the stress-strain hysteresis loop is drawn and its model parameters are analyzed. The parameter sensitivity analysis method is used to study the Bouc-Wen model and the dynamic test data are numerically simulated, and the effects of the model parameters on the stress-strain hysteresis loop, the dynamic shear modulus and the damping ratio are discussed. According to the dynamic test data of damming materials at home and abroad, the average curve of modulus attenuation and damping ratio increase of dam materials is obtained, and the model parameters are determined by genetic algorithm program compiled by MATLAB software. The cumulative deformation characteristics of gravel soil in the core wall of Nuozhadu earth-rock dam under cyclic load were investigated by using GDS dynamic triaxial instrument. The stress and strain hysteresis loop measured by cyclic triaxial test was simulated numerically by using Bouc-Wen model. Based on the results of parameter analysis and numerical fitting, this paper presents the parameter range of Bouc-Wen model suitable for damming materials, the mean square error of the fitting results of dynamic shear modulus attenuation curve and damping ratio growth curve of damming materials is less than 0.4 and the mean square error is less than 0.4. The accumulative strain values of eight vibration cycles in the cyclic triaxial test of Nuozhadu mixed gravel soil are 1.2% and 1.18%, respectively, and the predicted values of the model are 1.2% and 1.18% respectively. Based on the range of model parameters obtained in this paper, the Bouc-Wen model can effectively simulate the dynamic modulus damping and cumulative deformation characteristics of damming materials, and provide help for dynamic analysis of damming materials.
【作者單位】： 大連理工大學(xué)海岸與近海工程國家重點實驗室;
【基金】：國家自然科學(xué)基金面上資助項目(51179024;51379029)
【分類號】：TV41

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