本文關鍵詞：近斷層地震作用下懸跨海底管線響應研究　出處：《大連理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 近斷層地震 方向性效應 滑沖效應 懸跨海底管線 非線性動力響應 地震動輸入方向

【摘要】：隨著現(xiàn)代化工業(yè)的不斷推進,油氣資源的供需矛盾日益突出,而海底管線作為海底油氣運輸最高效、最經濟、最安全的方式,已成為工業(yè)化進程中的重要命脈,也是油氣的開采系統(tǒng)和儲存系統(tǒng)的重要組成部分。然而近幾年來,關于海底管線泄油事件頻發(fā),海底管線的安全性與可靠性也日益得到重視。尤其我國處在地震多發(fā)帶,地震對于管線的破壞所帶來的損失更是無法預估與彌補,建立安全的管線抗震機制必不可少。關于地震對于海底管線的響應國內外均已有大量的研究。然而就近斷層地震對于懸跨海底管線的響應較為有限。因此本文主要針對近斷層地震作用下懸跨海底管線的響應進行研究。目前主要把距離斷裂破裂面小于20km的區(qū)域看作近斷層區(qū)域,近斷層地震明顯區(qū)別于遠斷層地震在于其特有的速度脈沖效應,一開始的大幅值脈沖便會給結構造成永久的破壞,尤其是對長周期結構具有更強的破壞性。本文在關于近斷層地震已有研究的基礎上,選取了臺灣集集地震(1999年9月21日,震級MW=7.6)中的方向性效應、滑沖效應和遠斷層效應作為地震動輸入,作用在管線上的動水力通過推導的Morrison方程以附加質量的形式作用在管線上,利用有限元大型軟件ANSYS建立了懸跨海底管線的數(shù)值分析模型,該模型考慮了管線和土體的本構關系。據此,在三種地震效應作用下對懸跨海底管線進行了按水平方向一致輸入的地震時程分析,結果發(fā)現(xiàn)對于管線應采用非線性模型。在此基礎上,分別考慮了不同地震強度和不同自振周期下管線的非線性動力響應,并就三種地震效應下管線的響應進行了對比分析。通過對比分析發(fā)現(xiàn),相比于遠斷層地震近斷層地震效應對懸跨海底管線具有更顯著的影響,尤其對于具有長周期的懸跨海底管線具有更強的破壞性。由于實際地震輸入是多維的,為了找出對于懸跨海底管線最不利的地震動輸入方向,分別選取了具有六種不同的方向作為地震動輸入方向,首先就三種地震效應沿各個方向的地震輸入下管線的動力響應進行了分析對比,計算表明對于不同的輸入方向,三種地震效應下管線響應具有基本相同的響應規(guī)律。對不同方向地震動輸入下進一步比較發(fā)現(xiàn),當?shù)卣饎臃謩e沿X軸和Y軸的方向進行輸入時管線具有最小和最大響應。最后對不同平面內不同角度的地震動輸入下三種地震效應對于管線響應進行了比較。
[Abstract]:With the modernization of industry unceasing advancement, the contradiction between supply and demand of oil and gas resources have become increasingly prominent, and the sea transportation of oil and gas pipeline as the most efficient, most economical and safe way, has become an important lifeline in the process of industrialization, and it is also an important part of oil and gas exploitation system and storage system. However, over the past few years, the safety and reliability of submarine pipelines have been paid more and more attention to the frequent occurrence of oil discharge in submarine pipelines. Especially in China's earthquake prone area, the damage caused by earthquake damage to pipeline is unpredictable and compensated. It is essential to establish a safe pipeline anti-seismic mechanism. There has been a great deal of research on the response of earthquake to submarine pipelines both at home and abroad. However, the response of the near fault earthquake to the suspended submarine pipelines is limited. Therefore, this paper mainly studies the response of the submarine pipeline under the action of the near fault earthquake. At present the distance less than 20km fracture surface area as the near fault region, near fault earthquake is obviously different from the far fault earthquake lies in its unique effect of velocity pulse amplitude, a start pulse will cause permanent damage to the structure, especially for long period structure is more destructive. Based on the research on the existing earthquake near faults, selected the Taiwan Chi Chi earthquake (September 21, 1999, magnitude MW=7.6) directivity effect, the slip effect and far fault effect as seismic input in pipeline's hydrodynamic force through the derivation of the Morrison equation in the form of additional mass in the pipeline that established the numerical analysis model of submarine pipeline with large finite element software ANSYS, the model considers the constitutive relation of pipeline and soil. Based on this, the seismic time history analysis of the suspended submarine pipeline is carried out in horizontal direction under the action of three kinds of seismic effects. It is found that the nonlinear model should be adopted for pipelines. On this basis, the nonlinear dynamic responses of pipelines under different earthquake intensity and natural vibration period are considered respectively, and the responses of pipelines under three kinds of seismic effects are compared and analyzed. Through comparative analysis, it is found that the near fault seismic effect has a more significant impact on the suspended submarine pipeline than the far fault, especially for the long-span suspended submarine pipeline. Because of the actual seismic input is multidimensional, in order to find out the most unfavorable input direction of the submarine pipeline vibration, were selected with six different direction as seismic input direction, the first three kinds of seismic effect along each direction of earthquake input pipeline under the dynamic response of the calculation shows that for the input direction of the three earthquake under the effect of pipeline response has the same basic rule response. It is found that the pipeline has the minimum and maximum response when the local vibration is input along the direction of the X axis and the Y axis, respectively. In the end, three seismic effects under different angles of different angles are compared to the response of the pipeline.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P756.2

【參考文獻】

相關期刊論文 前7條

1 周晶;馮新;李昕;;海底管線全壽命安全運行的關鍵問題研究[J];工程力學;2011年S2期

2 唐煉;世界能源供需現(xiàn)狀與發(fā)展趨勢[J];國際石油經濟;2005年01期

3 張長浩;王虎;王薇;黃拓;;近斷層地震動對鋼筋混凝土框架結構地震反應的影響[J];混凝土與水泥制品;2011年04期

4 江義;楊迪雄;李剛;;近斷層地震動向前方向性效應和滑沖效應對高層鋼結構地震反應的影響[J];建筑結構學報;2010年09期

5 王滔;郭恩棟;張麗娜;胡煜文;;大跨斜拉橋地震動最不利輸入方向分析[J];世界地震工程;2007年04期

6 何曉宇;李宏男;;海洋平臺確定多維地震動最不利輸入方向的一種有效方法[J];振動與沖擊;2007年12期

7 董汝博;周晶;馮新;;部分懸跨海底管道多點輸入地震反應分析[J];振動工程學報;2008年02期

，

本文編號：1339797