【摘要】：大壩-庫水動力相互作用是混凝土壩在強震作用下動力響應的重要影響因素之一。合理地確定壩面在地震作用下的動水壓力及其對壩體地震響應的影響是大壩安全評估的重要基礎(chǔ)。目前,工程上用的Westergaard附加質(zhì)量法和數(shù)值方法如有限元法在計算模型的精度及效率等方面仍未能很好的滿足工程應用的需要。本文利用比例邊界有限元方法(SBFEM)計算地震作用下的動水壓力,然后將動水壓力作為荷載施加在基于Abaqus有限元平臺建立的壩體數(shù)值模型上,通過比例邊界有限元和有限元聯(lián)合計算,分析和比較了不同工況下的壩體地震響應。主要內(nèi)容如下：(1)用Fortran語言編寫的計算程序分別計算了Westergaard、Chopra數(shù)值解和SBFEM法的地震作用下動水壓力并加以比較,驗證了SBFEM法的正確性；(2)利用大型有限元計算軟件Abaqus分別計算了Westergaard基于附加質(zhì)量法和SBFEM動水壓力法的地震壩體彈性響應和塑性損傷響應,給出了計算結(jié)果。由于SBFEM方法具有可以對求解域降維求解,且可以考慮庫水的壓縮性和庫底吸收等影響因素的優(yōu)點,相對上述其它有限元方法,FEM-SBFEM聯(lián)合方法明顯提高了計算效率和計算結(jié)果的精度；(3)利用FEM-SBFEM聯(lián)合計算方法,探討了不同(水體可壓縮性、壩體高度、壩體厚度、庫底吸收等)工況下壩體地震應力、位移響應和塑性損傷區(qū)域。研究成果對混凝土壩體建設(shè)和抗震安全評價具有參考價值。
[Abstract]:The dam-reservoir hydrodynamic interaction is one of the most important factors affecting the dynamic response of concrete dams under strong earthquakes. It is an important basis for dam safety assessment to reasonably determine the dynamic water pressure of dam face under earthquake and its influence on the seismic response of dam body. At present, the Westergaard additional mass method and numerical method, such as finite element method, can not meet the need of engineering application in the accuracy and efficiency of the model. In this paper, the proportional boundary finite element method (SBFEM) is used to calculate the dynamic water pressure under earthquake, and then the dynamic water pressure is applied as a load to the dam body numerical model based on the Abaqus finite element platform. The seismic responses of the dam under different working conditions are analyzed and compared by the finite element method and the finite element method. The main contents are as follows: (1) the calculation program written in Fortran language calculates the dynamic water pressure under the action of Westergaard,Chopra numerical solution and SBFEM method respectively and compares it to verify the correctness of SBFEM method; (2) the elastic response and the plastic damage response of the seismic dam based on the additional mass method and the SBFEM hydrodynamic pressure method are calculated by using the large finite element calculation software Abaqus, respectively, and the calculated results are given. Because the SBFEM method has the advantages of reducing the dimension of the solution domain and considering the influence factors such as the compressibility of the reservoir water and the absorption of the reservoir bottom, the calculation efficiency and the accuracy of the calculation results are improved obviously compared with the other finite element method (FEM-SBFEM) mentioned above. (3) the seismic stress, displacement response and plastic damage area of the dam under different conditions (water compressibility, dam height, dam thickness, bottom absorption, etc.) are discussed by using FEM-SBFEM method. The research results have reference value for concrete dam construction and seismic safety evaluation.
【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】：2014
【分類號】：TV642;TV312

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