行波效应对大型水电站厂房地震响应的影响
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摘要
为研究行波效应对平面尺寸较大的水电站厂房结构地震响应的影响,选取某实际厂房结构,建立三维有限元模型,借助ABAQUS有限元软件,采用振型分解时程分析法进行结构动力计算。调整Koyna水平地震波加速度峰值为0.246 g作为地震荷载。结果表明行波效应影响厂房结构位移响应主要体现在动位移峰值上,波速不大时可能使动位移峰值最大减小25%;对加速度响应峰值和响应时程影响都较明显,波速较小时可能使得结构加速度峰值滞后于地震加速度峰值出现;不考虑行波效应对厂房结构设计是偏安全的。如工程所在地地震波传播速度不大,可以适当考虑行波效应,以使结构设计更趋科学合理。
In order to study the traveling wave effect on seismic response of hydropower house structure of a large plane scale,a three-dimensional finite element model of an actual powerhouse structure was created.The dynamic structural analysis was carried out with ABAQUS software,using modal superposition time-historic analytical method.Koyna earthquake transverse ground acceleration was selected as seismic load,with its peak value adjusted to 0.246g.The result shows that traveling wave mainly affects the peak value concerning dynamic displacement of powerhouse structure.On condition that the wave speed is small,the peak of dynamic displacement may decrease by 25% at the most.With regard to acceleration,the effect on peak value and time history is significant.The peak structural acceleration may lag behind the peak seismic acceleration due to a small wave speed.Ignoring the traveling wave effect is safe to structural design of powerhouse.If the earthquake wave speed at the project site is small,the traveling wave effect could be taken into proper consideration to optimize structural design more rationally.
In order to study the traveling wave effect on seismic response of hydropower house structure of a large plane scale,a three-dimensional finite element model of an actual powerhouse structure was created.The dynamic structural analysis was carried out with ABAQUS software,using modal superposition time-historic analytical method.Koyna earthquake transverse ground acceleration was selected as seismic load,with its peak value adjusted to 0.246g.The result shows that traveling wave mainly affects the peak value concerning dynamic displacement of powerhouse structure.On condition that the wave speed is small,the peak of dynamic displacement may decrease by 25% at the most.With regard to acceleration,the effect on peak value and time history is significant.The peak structural acceleration may lag behind the peak seismic acceleration due to a small wave speed.Ignoring the traveling wave effect is safe to structural design of powerhouse.If the earthquake wave speed at the project site is small,the traveling wave effect could be taken into proper consideration to optimize structural design more rationally.
引文
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[2]马震岳,董毓新,郭永刚,等.三峡水电站厂房结构动力分析与优化[J].水电能源科学,2000,18(3):26-28.
[3]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.
[4]欧阳金惠,陈厚群,张超然,等.三峡电站15#机组厂房结构动力分析[J].中国水利水电科学研究院学报,2007,5(2):137-142.
[5]张辉东,王日宣,王元丰.大型水电站厂房结构地震时程响应非线性数值模拟[J].水力发电学报,2007,26(4):96-102.
[6]王海军,练继建,王日宣.水电站厂房结构地震响应非线性分析[J].水电能源科学,2008,26(3):88-91.
[7]楼梦麟,林皋.重力坝地震行波反应分析[J].水利学报,1984(5):26-32.
[8]吴健,金峰,徐艳杰.拱坝随机地震行波效应分析[J].水利水电科技进展,2005,25(4):9-12.
[9]Liu Airong,Zhang Junping,Yu Qicai,et al.Study on dynamicproperties and traveling wave effect of Xinguang Bridge[J].Journal of Guangzhou University(Natural Science Edition),2007,6(4):74-80.
[10]丁阳,张笈玮,李忠献.行波效应对大跨度空间结构随机地震响应的影响[J].地震工程与工程振动,2008,28(1):24-31.
[11]刘晶波,杜修力.结构动力学[M].北京:机械工业出版社,2005.
[12]张文元.ABAQUS动力学有限元分析指南[M].香港:中国图书出版社,2005.
[13]中国水利水电科学研究院.DL5073—1997水工建筑物抗震设计规范[S].北京:中国电力出版社,1997.
[14]练继建,王海军,王日宣.河床式水电站厂房结构动力特性研究[J].水利水电技术,2004,35(8):37-40.
[15]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.
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