本文關鍵詞：FEM-SBFEM聯(lián)合計算庫水—壩體—無限地基系統(tǒng)的地震響應　出處：《沈陽工業(yè)大學》2016年碩士論文　論文類型：學位論文

  更多相關文章： 重力壩 比例邊界元有限元方法 動水壓力 無限地基 地震響應

【摘要】：庫水-大壩-無限地基系統(tǒng)的相互作用問題是重力壩在地震荷載作用下壩體動力響應的重要因素之一,研究壩體在地震荷載作用下的動力響應是混凝土大壩安全評估的重要基礎�；诒壤吔缬邢拊�(the Scaled Boundary Finite Element Method-SBFEM)計算上游壩面庫水壓力、基于無限單元法考慮無限地基輻射阻尼的影響,計算庫水-混凝土重力壩-無限地基系統(tǒng)不同工況下的地震響應�；赟BFEM方法計算混凝土壩面動水壓力,并將其與有限元法聯(lián)合計算庫水-壩體-無限地基系統(tǒng)的地震響應;利用大型有限元計算軟件Abaqus基于無質量地基模型和無限地基模型聯(lián)合SBFEM分別計算了不同地基彈性模量以及非均勻地基條件下庫水-壩體-無限地基系統(tǒng)的地震響應,并將計算結果進行對比分析,得到一些有意義的結論;然后利用SBFEM與Abaqus的聯(lián)合計算,探討了庫水-壩體-無限地基系統(tǒng)在不同地基彈性模量,不同阻尼比以及地基非均勻工況下壩體的地震動力響應及損傷區(qū)域,使其對壩體建設和抗震安全評價具有一定的參考價值。最后通過對比計算得到以下結論:在彈性情況下,隨著地基彈性模量的增加,壩體的動力響應逐漸增大,由此可見隨著地基剛度的增加,對壩體的影響也變大;在彈塑性情況下,地基彈性模量大于壩體的彈性模量(無質量地基模型與無限地基兩種模型)時,壩踵處均出現(xiàn)損傷,壩體的中間薄弱區(qū)則出現(xiàn)損傷區(qū)域并且貫穿至上游壩面;而小于壩體的彈性模量時,壩踵處則無損傷,但壩體的中間薄弱區(qū)也出現(xiàn)損傷區(qū)域并且貫穿至上游壩面;在彈性情況下,與無限地基模型相比,無質量地基模型計算所得的壩體位移以及應力分布基本相同但峰值明顯增大;在彈塑性損傷情況下,非均勻地基條件下出現(xiàn)的損傷區(qū)域略小于均勻地基的損傷區(qū)域,并且非均勻地基初始損傷時間也早于均勻地基的,特別是無質量地基模型(非均勻地基)損傷區(qū)域出現(xiàn)的時間更早一些。
[Abstract]:The interaction between reservoir, dam and infinite foundation system is one of the important factors for the dynamic response of gravity dam under earthquake load. To study the dynamic response of dam body under earthquake load is an important foundation of concrete dam safety assessment. The Scaled Boundary Finite Element method-SBFEMs calculate the upstream dam surface water pressure. The effect of radiation damping on infinite foundation is considered based on infinite element method. The seismic response of reservoir-concrete gravity dam-infinite foundation system under different working conditions is calculated. The dynamic water pressure on concrete dam surface is calculated based on SBFEM method. The seismic response of the system of reservoir water dam body and infinite foundation is calculated in conjunction with the finite element method. Based on the massless foundation model and infinite foundation model combined with SBFEM, the large finite element calculation software Abaqus is used to calculate the elastic modulus of different foundation and non-uniform foundation respectively. Seismic response of limited foundation system. The results are compared and analyzed, and some meaningful conclusions are obtained. Then, by using SBFEM and Abaqus's joint calculation, the elastic modulus of reservoir, dam and infinite foundation system in different foundation is discussed. The seismic dynamic response and damage area of dam body under different damping ratio and non-uniform working condition of foundation. It has certain reference value for dam construction and seismic safety evaluation. Finally, through comparison and calculation, the following conclusions are obtained: in elastic case, with the increase of elastic modulus of foundation, the dynamic response of dam body increases gradually. It can be seen that with the increase of foundation stiffness, the influence on dam body also becomes greater. When the elastic modulus of the foundation is larger than the elastic modulus of the dam body (both the massless foundation model and the infinite foundation model), damage occurs at the dam heel. The weak area in the middle of the dam body is damaged and runs through the upstream dam surface. When the elastic modulus of the dam is less than that of the dam, there is no damage at the heel of the dam, but the weak area in the middle of the dam is also damaged and runs through to the upstream surface of the dam. In the elastic case, compared with the infinite foundation model, the displacement and stress distribution of the dam body calculated by the massless foundation model is basically the same but the peak value is obviously increased. In the case of elastic-plastic damage, the damage area under the condition of non-uniform foundation is slightly smaller than that of the uniform foundation, and the initial damage time of the non-uniform foundation is earlier than that of the homogeneous foundation. In particular, the damage zone of the non-uniform foundation model appeared earlier.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TV698.13

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