高HD值压力管道取消伸缩节地震动力分析
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摘要
针对大型水电站厂坝间设置伸缩节造价高、制造、施工、维护难、运行期止水技术问题突出,采用三维有限元法建立了某大型水电站的有限元整体模型,分析评价了保留和取消伸缩节两种方案的自振特性,采用振型分解反应谱法计算分析了外包软垫层的伸缩管过缝方案在Ⅷ度设防烈度下的动力响应,并将地震动力响应与静力计算结果叠加,综合评价了伸缩管过缝结构的安全性,为取消压力管道伸缩节的可行性分析提供了依据。
An overall finite element model of a large scale hydropower station is established by three-dimensional finite element method.Firstly,modal analysis is made,which evaluates the vibration characteristics of two schemes,namely retaining expansion joints and canceling expansion joints.And then,under the action of 8 degrees earthquake,dynamic response of expansion pipe is calculated by using mode-superposition response spectrum method.Finally,with the superposition of the seismic dynamic response and the results of static calculation,comprehensive safety evaluation of expansion pipe is made,so a basis for studing the feasibility of canceling expansion joints is provided.
An overall finite element model of a large scale hydropower station is established by three-dimensional finite element method.Firstly,modal analysis is made,which evaluates the vibration characteristics of two schemes,namely retaining expansion joints and canceling expansion joints.And then,under the action of 8 degrees earthquake,dynamic response of expansion pipe is calculated by using mode-superposition response spectrum method.Finally,with the superposition of the seismic dynamic response and the results of static calculation,comprehensive safety evaluation of expansion pipe is made,so a basis for studing the feasibility of canceling expansion joints is provided.
引文
[1]赵德海,董毓新,陈婧.某大型水电站取消厂坝间压力钢管伸缩节研究[J].大连理工大学学报,2000,40(4):496-499
[2]常晓林,何蕴龙.地震情况下地基、库水、拱坝的相互作用[J].武汉水利电力大学学报,1998,31(4):1-5
[3]杜修力,王进廷.动水压力及其对坝体地震反应影响的研究进展[J].水利学报,2001,(7):13-21
[4]Westergaard H M.Water Pressure on Dams DuringEarthquakes[J].Trans.ASCE,1933,98:418-433
[5]中国水利水电科学研究院,电力工业部昆明勘测设计研究院,电力工业部西北勘测设计研究院,等.水工建筑物抗震设计规范(SL 203-97)[S].北京:中国水利水电出版社,1997.
[6]国家电力公司西北勘测设计研究院,国家电力公司昆明勘测设计研究院,武汉大学.水电站压力钢管设计规范(DL/T5141-2001)[S].北京:中国电力出版社,2002.
[2]常晓林,何蕴龙.地震情况下地基、库水、拱坝的相互作用[J].武汉水利电力大学学报,1998,31(4):1-5
[3]杜修力,王进廷.动水压力及其对坝体地震反应影响的研究进展[J].水利学报,2001,(7):13-21
[4]Westergaard H M.Water Pressure on Dams DuringEarthquakes[J].Trans.ASCE,1933,98:418-433
[5]中国水利水电科学研究院,电力工业部昆明勘测设计研究院,电力工业部西北勘测设计研究院,等.水工建筑物抗震设计规范(SL 203-97)[S].北京:中国水利水电出版社,1997.
[6]国家电力公司西北勘测设计研究院,国家电力公司昆明勘测设计研究院,武汉大学.水电站压力钢管设计规范(DL/T5141-2001)[S].北京:中国电力出版社,2002.
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