河床式水电站厂房结构流固耦合振动特性研究
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摘要
鉴于厂房结构在地震作用下可能出现的严重后果,地震时动水压力对厂房结构的振动特性的影响就成为厂房结构设计的一个重要控制因素。结合某河床式水电站厂房实际工程,以有限元软件ANSYS为平台,建立三维有限元模型,分析地震动水压力对其振动特性的影响。分析结果表明:地震动水压力作用增加了坝面附加质量,从而降低了厂房的自振频率,并且对振型产生了一定的影响,尤其是进水口闸墩、尾水管闸墩等局部振型变化,因此对其作用下的厂房自振频率进行分析显得极为必要;随着上游水位的降低,厂房整体质量减小了,地震动水压力作用下的厂房自振频率随之增大,不同水位下厂房振型明显有所改变。
In view of the possible serious consequence of hydropower structure under seismic action,the influence of dynamic water pressure produced by seismic on the vibration characteristics of hydropower structure has become an important control factor of hydropower structure design. Combining with practical powerhouse engineering of a riverbed-hydropower station,the paper used ANSYS as a platform to establish three-dimensional finite element model and analyze the influence of seismic dynamic water pressure on the vibration characteristics of hydropower structure. The results shows that seismic dynamic water pressure increases the added mass of dam surface,and then reduces the vibration frequency of powerhouse itself,and has certain influence on vibration mode,especially the local vibration mode changes of water inlet gate pier and draft tube gate pier etc. So it is necessary to analyze the frequency of natural vibration under the effect of seismic dynamic water pressure; with the reduction of upstream water level,the overall quality of hydropower is decreased and the frequency of natural vibration of hydropower under the action of seismic dynamic water pressure is increasing. The vibration modes of powerhouse under different water levels are obviously changed.
In view of the possible serious consequence of hydropower structure under seismic action,the influence of dynamic water pressure produced by seismic on the vibration characteristics of hydropower structure has become an important control factor of hydropower structure design. Combining with practical powerhouse engineering of a riverbed-hydropower station,the paper used ANSYS as a platform to establish three-dimensional finite element model and analyze the influence of seismic dynamic water pressure on the vibration characteristics of hydropower structure. The results shows that seismic dynamic water pressure increases the added mass of dam surface,and then reduces the vibration frequency of powerhouse itself,and has certain influence on vibration mode,especially the local vibration mode changes of water inlet gate pier and draft tube gate pier etc. So it is necessary to analyze the frequency of natural vibration under the effect of seismic dynamic water pressure; with the reduction of upstream water level,the overall quality of hydropower is decreased and the frequency of natural vibration of hydropower under the action of seismic dynamic water pressure is increasing. The vibration modes of powerhouse under different water levels are obviously changed.
引文
[1]刘波,伍鹤皋,李冲.大型水电站地下厂房结构自振特性研究[J].武汉大学学报(工学版),2011,44(4):419-422.
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[4]徐金英,李德玉,郭胜山.基于ABAQUS的两种库水附加质量模型下重力坝动力分析[J].中国水利水电科学研究院学报,2014,12(1):98-103.
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[7]张存慧,马震岳,周述达,等.大型水电站厂房结构流固耦合分析[J].水力发电学报,2012,31(6):192-197.
[8]王基盛,杨庆山.流体环境中结构附加质量的计算[J].北方交通大学学报,2003,27(1):40-43.
[9]钱若军,董石麟,袁行飞.流固耦合理论研究进展[J].空间结构,2008,14(1):3-15.
[10]苏礼邦,刘云贺,李守义.灯泡贯流式水电站厂房坝段的抗震分析[J].西北农林科技大学学报(自然科学版),2007,35(7):202-206.
[11]张书华,赵中华.基于ANSYS的水电站厂房结构自振特性分析[J].山西建筑,2014,40(9):23-24.
[12]黄耀英,孙大伟,田斌.两种库水附加质量模型的重力坝动力响应研究[J].人民长江,2009,40(7):64-66.
[13]党国强,李守义,鞠静春,等.河床式水电站厂房坝段动力分析[J].电网与水力发电进展,2008,24(3):70-73.
[14]徐国宾,张婷婷,王海军,等.河床式水电站流道水体附加质量计算方法研究[J].水利水电技术,2012,43(3):19-22+62.
[2]于倩倩.河床式水电站厂房结构的地震响应分析方法研究[D].天津:天津大学,2012.
[3]陈锋,王春江,周岱.流固耦合理论与算法评述[J].空间结构,2012,18(4):55-63.
[4]徐金英,李德玉,郭胜山.基于ABAQUS的两种库水附加质量模型下重力坝动力分析[J].中国水利水电科学研究院学报,2014,12(1):98-103.
[5]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,2001,32(7):13-21.
[6]张辉东,周颖.大型水电站厂房结构流固耦合振动特性研究[J].水力发电学报,2007,26(5):134-137,111.
[7]张存慧,马震岳,周述达,等.大型水电站厂房结构流固耦合分析[J].水力发电学报,2012,31(6):192-197.
[8]王基盛,杨庆山.流体环境中结构附加质量的计算[J].北方交通大学学报,2003,27(1):40-43.
[9]钱若军,董石麟,袁行飞.流固耦合理论研究进展[J].空间结构,2008,14(1):3-15.
[10]苏礼邦,刘云贺,李守义.灯泡贯流式水电站厂房坝段的抗震分析[J].西北农林科技大学学报(自然科学版),2007,35(7):202-206.
[11]张书华,赵中华.基于ANSYS的水电站厂房结构自振特性分析[J].山西建筑,2014,40(9):23-24.
[12]黄耀英,孙大伟,田斌.两种库水附加质量模型的重力坝动力响应研究[J].人民长江,2009,40(7):64-66.
[13]党国强,李守义,鞠静春,等.河床式水电站厂房坝段动力分析[J].电网与水力发电进展,2008,24(3):70-73.
[14]徐国宾,张婷婷,王海军,等.河床式水电站流道水体附加质量计算方法研究[J].水利水电技术,2012,43(3):19-22+62.
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