土石坝动力反应分析的阻尼模型及计算频率
|
摘要
土石坝动力计算中,通常采用基频作为控制频率的Rayleigh阻尼模型。这样处理对50m左右的低坝是基本合适的;而对300m级的高坝,会高估高阶振型的阻尼比,低估坝体的地震反应,使设计偏不安全。研究了Rayleigh阻尼模型2个控制频率的不同取法以及不同特征周期的规范谱人工地震波对坝体地震反应的影响,认为阻尼控制频率的选取应综合考虑坝体动力特性及地震波的频谱特性。
Rayleigh damping model was adopted commonly in seismic response analysis of earth-rock dam.It is appropriate for lower dams that the height is about 50 m;and the modal damping ratios are overrated and the seismic responses are underrated for 300 m high dam.In this paper,the seismic responses of earth-rock dams have been studied by Rayleigh damping models and 2 frequencies spectrum seismic wave.The calculation results shows that the calculated frequency of damping model is affected by dam dynamic character and frequency spectrum of input seismic wave.
Rayleigh damping model was adopted commonly in seismic response analysis of earth-rock dam.It is appropriate for lower dams that the height is about 50 m;and the modal damping ratios are overrated and the seismic responses are underrated for 300 m high dam.In this paper,the seismic responses of earth-rock dams have been studied by Rayleigh damping models and 2 frequencies spectrum seismic wave.The calculation results shows that the calculated frequency of damping model is affected by dam dynamic character and frequency spectrum of input seismic wave.
引文
[1]董军,邓洪洲,王肇民.结构动力分析阻尼模型研究[J],世界地震工程,2000,16(4):63-69.DONG Jun,DENG Hong-zhou,WANG Zhao-min.Studies on the damping models for structural dynamictime history analysis[J].World Information on Earth-quake Engineering,2000,16(4):63-69.(in chinese)
[2]R.W.Clough,J.Penzien.Dynamics of structures[M].New York:McGraw-Hill,Inc.,2003.
[3]迟世春.高面板堆石坝动力反应分析和抗震稳定分析方法[D].南京:河海大学,1995.CHI Shi-chun.Dynamic response analysis and seismicslope stability analysis method of high concrete facerockfill dams[D].Nanjing:Hohai University,1995.(in chinese)
[4]DL5073-2000,水工建筑物抗震设计规范[S].DL5073-2000Specifications for seismic design of hy-draulic structures[S].(in Chinese)
[5]张锐.高土石坝地震作用效应及坝坡抗震稳定分析研究[D].大连:大连理工大学,2008.ZHANG Rui.Analysis and research of seismic effectsand slope seismic stability of high earth and rockfilldams[D].Dalian:Dalian University of Technology,2008.(in Chinese)
[6]楼梦麟,殷琳.关于高土石坝地震反应分析中的阻尼模型的讨论[J].水利发电学报,2009,28(6):103-107.LOU Meng-lin,YIN Lin.Discussion on damping mod-els for seismic response analysis of high earth dams[J].Journal of Hydroelectric Engineering,2009,28(6):103-107.(in Chinese)
[7]楼梦麟,潘旦光.滞后阻尼在土层时域分析中的应用[J].同济大学学报,2004,32(3):281-285.LOU Meng-lin,PAN Dan-guang.Hysteretic dampingapplication in time domain analysis of soil layer[J].Journal of Tongji University,2004,32(3):281-285.(in Chinese)
[8]邹德高,徐斌,孔宪京.瑞利阻尼系数确定方法对高土石坝地震反应的影响研究[J].岩土力学,2011,32(3):797-803.ZOU De-gao,XU Bin,KONG Xian-jing.Study of in-fluence of different methods for calculating Rayleighdamping coefficient on high earth-rock dam seismic re-sponse[J].Rock and Soil Mechanics,2011,32(3):797-803.(in Chinese)
[9]迟世春,陈崇茂,张宗亮.土石坝料动力试验数据的一种统计公式[J].水利与建筑工程学报,2011,9(6):5-8.CHI Shi-chun,CHEN Chong-mao,ZHANG Zong-li-ang.A statistical formula for test data about dynamiccharacteristics of earth-rock dam materials[J].Jour-nal of Water Resources and Architectural Engineering,2011,9(6):5-8.(in Chinese)
[2]R.W.Clough,J.Penzien.Dynamics of structures[M].New York:McGraw-Hill,Inc.,2003.
[3]迟世春.高面板堆石坝动力反应分析和抗震稳定分析方法[D].南京:河海大学,1995.CHI Shi-chun.Dynamic response analysis and seismicslope stability analysis method of high concrete facerockfill dams[D].Nanjing:Hohai University,1995.(in chinese)
[4]DL5073-2000,水工建筑物抗震设计规范[S].DL5073-2000Specifications for seismic design of hy-draulic structures[S].(in Chinese)
[5]张锐.高土石坝地震作用效应及坝坡抗震稳定分析研究[D].大连:大连理工大学,2008.ZHANG Rui.Analysis and research of seismic effectsand slope seismic stability of high earth and rockfilldams[D].Dalian:Dalian University of Technology,2008.(in Chinese)
[6]楼梦麟,殷琳.关于高土石坝地震反应分析中的阻尼模型的讨论[J].水利发电学报,2009,28(6):103-107.LOU Meng-lin,YIN Lin.Discussion on damping mod-els for seismic response analysis of high earth dams[J].Journal of Hydroelectric Engineering,2009,28(6):103-107.(in Chinese)
[7]楼梦麟,潘旦光.滞后阻尼在土层时域分析中的应用[J].同济大学学报,2004,32(3):281-285.LOU Meng-lin,PAN Dan-guang.Hysteretic dampingapplication in time domain analysis of soil layer[J].Journal of Tongji University,2004,32(3):281-285.(in Chinese)
[8]邹德高,徐斌,孔宪京.瑞利阻尼系数确定方法对高土石坝地震反应的影响研究[J].岩土力学,2011,32(3):797-803.ZOU De-gao,XU Bin,KONG Xian-jing.Study of in-fluence of different methods for calculating Rayleighdamping coefficient on high earth-rock dam seismic re-sponse[J].Rock and Soil Mechanics,2011,32(3):797-803.(in Chinese)
[9]迟世春,陈崇茂,张宗亮.土石坝料动力试验数据的一种统计公式[J].水利与建筑工程学报,2011,9(6):5-8.CHI Shi-chun,CHEN Chong-mao,ZHANG Zong-li-ang.A statistical formula for test data about dynamiccharacteristics of earth-rock dam materials[J].Jour-nal of Water Resources and Architectural Engineering,2011,9(6):5-8.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心