本文選題：結(jié)構(gòu)-地基相互作用　切入點：人工阻尼系數(shù)　出處：《振動工程學(xué)報》2017年02期 　論文類型：期刊論文

【摘要】：阻尼溶劑抽取法中關(guān)鍵因素包括人工阻尼系數(shù)和有限區(qū)域尺寸等,對結(jié)構(gòu)-地基相互作用的分析計算有很大的影響。為消除關(guān)鍵因素取值隨機性對計算結(jié)果的影響、有效控制交界面相互作用計算結(jié)果的精確度和計算效率,分析了彈性地基上桿件在不同狀態(tài)下無量綱動力剛度系數(shù)間的相互關(guān)系,構(gòu)建了關(guān)鍵因素取值優(yōu)化模型。無量綱有限區(qū)域大小與人工阻尼系數(shù)的函數(shù)關(guān)系式定義為目標(biāo)函數(shù),無阻尼無限桿近似計算與解析計算的動力剛度系數(shù)差值函數(shù)定義為約束條件。已知偏移允許最大值和節(jié)點振動幅值衰減目標(biāo)值,解得無阻尼無限桿近似計算動力剛度系數(shù)中關(guān)鍵因素的最優(yōu)取值。數(shù)值算例驗證了關(guān)鍵因素取值優(yōu)化模型及求解方法是合理可行的,能夠有效控制模擬計算的精確度和計算效率,亦驗證了該模型的工程適用性。
[Abstract]:The key factors of damping solvent extraction method include artificial damping coefficient and finite area size, which have great influence on the analysis and calculation of structure-foundation interaction. The accuracy and efficiency of the calculation results of interface interaction are effectively controlled, and the relationship between dimensionless dynamic stiffness coefficients of members on elastic foundation under different conditions is analyzed. The optimization model of the key factors is constructed. The function relation between the dimensionless finite region size and the artificial damping coefficient is defined as the objective function. The difference function of dynamic stiffness coefficient between approximate calculation and analytical calculation of undamped infinite rod is defined as constraint condition. The maximum allowable offset and the attenuation target value of nodal vibration amplitude are known. The optimal value of the key factors in the dynamic stiffness coefficient is obtained by solving the undamped infinite rod approximation. The numerical example shows that the optimization model and the solution method for the key factors are reasonable and feasible. It can effectively control the accuracy and efficiency of the simulation calculation, and verify the engineering applicability of the model.
【作者單位】： 河海大學(xué)水利水電學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51279053)
【分類號】：TU435
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本文編號：1630962