| 土石坝二维多点输入地震反应分析 |
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| 引用本文： | 田景元,刘汉龙,陈国兴,吴军,谢绍宁.土石坝二维多点输入地震反应分析[J].岩土力学,2004,25(1):99-104. |
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| 作者姓名： | 田景元 刘汉龙 陈国兴 吴军 谢绍宁 |
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| 作者单位： | 1. 河海大学岩土工程研究所，江苏 南京 210098； 2.南京工业大学岩土工程研究所，江苏 南京 210009； 3. 盐城市高速公路建设指挥部，江苏 盐城 224007； 4.内江市东兴区建筑设计室，四川 内江 641003 |
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| 摘 要： | 剖析了多点输入反应机理，指出差动力只作用在与外部节点共单元的内部节点上。以人工合成进行了速度归零化处理的外部节点的水平和竖向地震加速度时程作为输入，考察大坝的损伤值、动剪应力、永久位移反应。分析表明，对于高约200 m的大型土石坝，多点与单点输入反应相比，坝体底部有的部位累积损伤值及动剪应力有所加大，而其他部位特别是极易破坏的斜坡部位损伤值及动剪应力明显减弱，永久位移特别是坝顶竖向永久位移减弱明显；而对于扁平的高约80 m的土石坝，多点输入比单点输入反应强烈。因此，在土石坝设计中有进行多点输入地震反应分析的必要。
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| 关 键 词： | 多点输入 差动力 人工地震波 累计损伤值 永久位移 |
| 文章编号： | 1000-7598-(2004)01-0099-06 |
| 收稿时间： | 2002-09-23 |
Earth-rock dam's earthquake response to 2 dimensional multi-point input |
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| TIAN Jing-yuan,LIU Han-long,CHEN Guo-xing,WU Jun,XIE Shao-ning.Earth-rock dam''''s earthquake response to 2 dimensional multi-point input[J].Rock and Soil Mechanics,2004,25(1):99-104. |
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| Authors: | TIAN Jing-yuan LIU Han-long CHEN Guo-xing WU Jun XIE Shao-ning |
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| Institution: | 1. Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China; 2. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009, China; 3. Yancheng Highway Construction Bureau, Yancheng 224007, China; 4. Architecture designing sector of Dongxing District, Neijiang 641003, China |
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| Abstract: | The mechanism of dam’s earthquake response to 2 dimensional multi-point input is analyzed in detail; and it is pointed that the inner points, on which the differential force acts are in the finite elements with outer points. With the input of outer points’ horizontal and vertical artificial earthquake waves whose velocity is zeroized, the response of damage value, dynamic shear stress and permanent displacement is analyzed. As for the large-sized dam of 200 meters height, the damage value and dynamic shear stress computed by multi-point input at some position at the bottom of the dam are bigger, while in other parts are obviously smaller than that computed by one-point input; especially in the slope of the dam where is prone to wreck; and the permanent displacement computed by multi-point input is smaller, obviously at the top of the dam. But for the flat dam of 80 meters height or so, dam’s response to multi-point input is tenser than that by one-point input, so multi-point input is necessary in earth-rock dam’s designing. |
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| Keywords: | multi-point input differential force artificial earthquake wave damage value permanent displacement |
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