【摘要】：圍繞國家能源戰(zhàn)略部署,一批高混凝土拱壩和高混凝土重力壩即將在水能資源充沛的云南、四川地區(qū)建設(shè)。該地區(qū)處于地震多發(fā)區(qū),高混凝土壩的抗震安全評(píng)價(jià)及災(zāi)變過程研究刻不容緩。本文的研究目的是得到拱壩和重力壩兩種常見的混凝土壩型在地震荷載作用下的動(dòng)力響應(yīng),并且指出拉伸損傷發(fā)生的部位和裂縫的發(fā)展情況。研究方法基于有限元軟件ABAQUS內(nèi)嵌的混凝土損傷塑性模型,對(duì)國內(nèi)某拱壩及重力壩在強(qiáng)烈地震作用下的動(dòng)力響應(yīng)進(jìn)行了數(shù)值模擬,得到了地震全過程拱壩及重力壩拉損傷分布和典型單元的損傷發(fā)展時(shí)程,給出了拱壩及重力壩的損傷發(fā)生、發(fā)展過程,并指出了兩種壩型的抗震薄弱部位,為高混凝土壩抗震安全評(píng)價(jià)提供了一種分析途徑。具體主要內(nèi)容有： (1)簡要介紹論文所用到的理論知識(shí),即有限元基本原理、動(dòng)力方程的建立以及損傷力學(xué)的基本概念。介紹了ABAQUS內(nèi)嵌的混凝土損傷塑性模型及該模型所用到的輸入?yún)?shù)。 (2)以國內(nèi)某拱壩為工程背景剖分形成三維有限元模型,對(duì)其進(jìn)行模態(tài)分析,提取振型及拱壩固有頻率,開展線彈性和非線性兩種模型下自重和地震作用組合工況的數(shù)值計(jì)算,整理得到頂拱及拱冠梁處的各方向加速度、各方向位移及第一主應(yīng)力包絡(luò)曲線,并對(duì)比了兩種本構(gòu)模型得到的結(jié)果變量的包絡(luò)圖。提取地震作用下高拱壩的典型單元的損傷發(fā)展時(shí)程,從上下游面、垂直z軸切面、垂直x軸切面三個(gè)角度給出了壩體最終的損傷分布情況,探討了高拱壩在地震作用下的裂縫擴(kuò)展過程。 (3)建立西部某重力壩的有限元模型,進(jìn)行模態(tài)分析,開展線彈性和非線性兩種模型下自重和地震作用組合工況的數(shù)值計(jì)算,整理得到上下游折坡點(diǎn)、壩踵及壩趾等關(guān)鍵位置處的各方向加速度、位移及第一主應(yīng)力時(shí)程曲線,并對(duì)比了兩種本構(gòu)模型得到的結(jié)果變量。從上下游視角、垂直y軸水平切面、垂直z軸豎直切面三個(gè)角度給出了壩體最終的損傷分布情況,探討了高重力壩在地震作用下的裂縫擴(kuò)展過程,并與之前的模型試驗(yàn)進(jìn)行了對(duì)比。
[Abstract]:According to the national energy strategy, a number of high concrete arch dams and high concrete gravity dams will be built in Yunnan and Sichuan regions with abundant hydro energy resources. This area is in the earthquake prone area. It is urgent to study the seismic safety evaluation and catastrophic process of high concrete dam. The purpose of this paper is to obtain the dynamic response of two common concrete dam types, arch dam and gravity dam, under earthquake load, and to point out the location of tensile damage and the development of cracks. Based on the damage plastic model of concrete embedded in finite element software ABAQUS, the dynamic response of an arch dam and gravity dam under strong earthquake is numerically simulated. The tensile damage distribution of arch dam and gravity dam during earthquake and the damage development history of typical elements are obtained. The damage occurrence and development process of arch dam and gravity dam are given, and the weak seismic sites of two types of dam are pointed out. It provides an analytical approach for seismic safety evaluation of high concrete dams. The main contents are as follows: (1) A brief introduction of the theoretical knowledge used in the paper, namely, the basic principles of finite element, the establishment of dynamic equations and the basic concepts of damage mechanics. The damage plastic model of concrete embedded in ABAQUS and the input parameters used in the model are introduced. (2) taking an arch dam in China as the engineering background, a three-dimensional finite element model is formed, and the modal analysis is carried out, the natural frequencies of the arch dam are extracted, and the numerical calculation of the combined working conditions of deadweight and seismic action under the linear elastic and nonlinear models is carried out. The envelope curves of acceleration, displacement and principal stress in each direction of the arch and arch crown beam are obtained, and the envelope diagrams of the result variables obtained by the two constitutive models are compared. The damage development time history of typical elements of high arch dam under earthquake action is extracted. The final damage distribution of the dam body is given from three angles: upstream and downstream plane, vertical z axis section plane and vertical x axis section plane. The crack propagation process of high arch dam under earthquake is discussed. (3) the finite element model of a gravity dam in the west of China is established, the modal analysis is carried out, and the numerical calculation of the combined working conditions of deadweight and seismic action under the linear elastic and nonlinear models is carried out, and the upstream and downstream break slope points are obtained. The time history curves of acceleration displacement and first principal stress at the key positions such as dam heel and dam toe are compared and the result variables obtained by two constitutive models are compared. The ultimate damage distribution of dam body is given from three angles of view, vertical y axis horizontal section and vertical z axis vertical cut plane, and the crack propagation process of high gravity dam under earthquake is discussed. And compared with the previous model test.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV642;TV312

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 肖詩云,林皋,李宏男;拱壩非線性地震反應(yīng)分析[J];地震工程與工程振動(dòng);2002年04期

2 顧愛軍;;含誘導(dǎo)縫壩體的非線性斷裂力學(xué)分析[J];合肥工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2005年12期

3 張勁;王慶揚(yáng);胡守營;王傳甲;;ABAQUS混凝土損傷塑性模型參數(shù)驗(yàn)證[J];建筑結(jié)構(gòu);2008年08期

4 陳健云,林皋,胡志強(qiáng);考慮混凝土應(yīng)變率變化的高拱壩非線性動(dòng)力響應(yīng)研究[J];計(jì)算力學(xué)學(xué)報(bào);2004年01期

5 黃云,金峰,王光綸,張楚漢;高拱壩上游壩踵裂縫穩(wěn)定性及其擴(kuò)展[J];清華大學(xué)學(xué)報(bào)(自然科學(xué)版);2002年04期

6 方修君;金峰;王進(jìn)廷;;基于擴(kuò)展有限元法的Koyna重力壩地震開裂過程模擬[J];清華大學(xué)學(xué)報(bào)(自然科學(xué)版);2008年12期

7 陳勝宏,汪衛(wèi)明,徐明毅,鄒麗春;小灣高拱壩壩踵開裂的有限單元法分析[J];水利學(xué)報(bào);2003年01期

8 邱戰(zhàn)洪,張我華,任廷鴻;地震荷載作用下大壩系統(tǒng)的非線性動(dòng)力損傷分析[J];水利學(xué)報(bào);2005年05期

9 杜效鵠,段云嶺,王光綸;重力壩斷裂數(shù)值分析研究[J];水利學(xué)報(bào);2005年09期

10 潘堅(jiān)文;王進(jìn)廷;張楚漢;;超強(qiáng)地震作用下拱壩的損傷開裂分析[J];水利學(xué)報(bào);2007年02期

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