考虑土-结构相互作用效应和土质地基非线性的核岛厂房结构地震响应分析
|
摘要
有效模拟土一结构相互作用(SSI)和土体非线性特征是进行土质地基条件下核岛厂房结构地震响应分析的关键技术问题。基于SuperFLUSH软件平台,采用等效线性法描述近场地基非线性动力特征,通过在地基有限区域设置黏性人工边界来模拟半无限地基辐射阻尼效应的影响,并利用一维有限元法进行自由场响应分析实现地震动的输入,从而建立土质地基条件核岛厂房结构地震响应分析计算模型。最后,以某土质地基条件下的CPR1000堆型反应堆厂房的集中质量简化模型作为研究对象,开展考虑SSI效应和分层土质地基非线性对于核岛厂房结构地震响应特征影响研究,验证了该计算模型的精度和工程应用效果。研究表明:考虑SSI效应,可有效吸收散射波波动能量,减小结构响应;考虑土质地基非线性效应,加速度幅值在不同方向均有不同程度的降低,峰值频率明显的向低频偏移,因此,同时考虑SSI效应及土质地基的非线性特征,并将两者相结合的分析方法对核岛厂房结构抗震分析是必要的。
The effective simulation of soil-structure interaction and the nonlinear characteristics of soil is a key technical problem for conducting a seismic response analysis of soil foundations on nuclear island.A one-dimensional finite element model of nuclear structure is established on the software platform of SuperFLUSH by simulating the radial damping through setting viscous artificial boundary in the limited area of foundation to analyze the response of free field to the ground motion input,then to describe the nonlinear dynamic characteristics in the near field ground using equivalent linear method.Furthermore a case study of a simplified lumped mass model for CPR1000 nuclear reactor in the soil foundation is investigated about the effect of SSI and nonlinear layered soil foundation on the seismic response characteristics of nuclear island building structure.Numerical results verify the reliability and applicability of the proposed model in engineering application.With the consideration of SSI effect,the model of viscous artificial boundary can effectively absorb the energy of scattered waves and reduce structural response.With the consideration of the nonlinear characteristics of soil,the acceleration amplitudes decrease to a certain extent in different directions,and the peak frequency shifts to low frequency.Based on above analysis,the combination of SSI and the nonlinear characteristics of soil is necessary for seismic analysis of nuclear island.
The effective simulation of soil-structure interaction and the nonlinear characteristics of soil is a key technical problem for conducting a seismic response analysis of soil foundations on nuclear island.A one-dimensional finite element model of nuclear structure is established on the software platform of SuperFLUSH by simulating the radial damping through setting viscous artificial boundary in the limited area of foundation to analyze the response of free field to the ground motion input,then to describe the nonlinear dynamic characteristics in the near field ground using equivalent linear method.Furthermore a case study of a simplified lumped mass model for CPR1000 nuclear reactor in the soil foundation is investigated about the effect of SSI and nonlinear layered soil foundation on the seismic response characteristics of nuclear island building structure.Numerical results verify the reliability and applicability of the proposed model in engineering application.With the consideration of SSI effect,the model of viscous artificial boundary can effectively absorb the energy of scattered waves and reduce structural response.With the consideration of the nonlinear characteristics of soil,the acceleration amplitudes decrease to a certain extent in different directions,and the peak frequency shifts to low frequency.Based on above analysis,the combination of SSI and the nonlinear characteristics of soil is necessary for seismic analysis of nuclear island.
引文
[1]戚承志,钱七虎.核电站抗震研究综述[J].地震工程与工程振动,2000,20(3):76-86.QI Cheng-zhi,QIAN Qi-hu.Overview of seismic research for nuclear power plant[J].Earthquake Engineering and Engineering Vibration,2000,20(3):76-86.
[2]赵杰,金煜皓,王桂萱.田湾核电站5、6号机组常规岛主厂房结构抗震性能分析[J].工程抗震与加固改造,2014,36(6):89-94.ZHAO Jie,JIN Yu-hao,WANG Gui-xuan.Structural dynamic antiseismic performance analysis on the main machine hall in conventional island of Tianwan nuclear power station unit S,6[J].Earthquake Resistant Engineering and Retrofitting,2014,36(6):89-94.
[3]尹训强,袁文志,王桂萱.复杂非均质场地条件下核电厂HPX泵房的静动力联合分析[J].岩土力学,2016,37(增刊2):745-752.YIN Xun-qiang,YUAN Wen-zhi,WANG Gui-xuan.Static-dynamic coupling analysis of pumping station of nuclear power plant under complicated heterogeneous site condition[J].Rock and Soil Mechanics,2016,37(Supp.2):745-752.
[4]李小军,侯春林,戴志军,等.核岛结构设计地基场地及计算基底效应研究[J].岩土力学,2015,36(8):2202-2208.LI Xiao-jun,HOU Chun-lin,DAI Zhi-jun,et al.Research on site effects of soil layers and bedrock on designing the foundation of nuclear island structure[J].Rock and Soil Mechanics,2015,36(8):2202-2208.
[5]金煜皓,尹训强,王桂萱.不同地基条件对核岛厂房结构地震响应的影响[J].华侨大学学报(自然科学版),2015,36(6):711-715.JIN Yu-hao,YIN Xun-qiang,WANG Gui-xuan.Effects of different ground conditions on seismic response of nuclear island[J].Journal of Huaqiao University(Natural Sciences),2015,36(6):711-715.
[6]艾智勇,蔡建邦.层状地基上弹性地基梁的有限元-边界元耦合分析[J].岩土力学,2015,36(增刊2):686-688.AI Zhi-yong,CAI Jian-bang.FEM/BEM coupling analysis of elastic foundation beam on layered soils[J].Rock and Soil Mechanics,2015,36(Supp.2):686-688.
[7]陈灯红,杜成斌.结构-地基动力相互作用的时域模型[J].岩土力学,2014,35(4):1165-1172.CHEN Deng-hong,DU Cheng-bin.A computational model for structure-foundation dynamic interaction in time domain[J].Rock and Soil Mechanics,2014,35(4):1165-1172.
[8]SONG C,WOLF J P.Dynamic stiffness of unbounded medium based on damping solvent extraction[J].Earthquake Engineering Structure Dynamic,1994,23(2):169-181.
[9]卢华喜,梁平英,尚守平.地基非线性波动问题中黏-弹性人工边界研究[J].岩土力学,2008,29(7):1911-1916.LU Hua-xi,LIANG Ping-ying,SHANG Shou-ping.Research on viscoelastic artificial boundary for problem of nonlinear wave motion in soil[J].Rock and Soil Mechanics,2008,29(7):1911-1916.
[10]HAGSTROM T.Radiation boundary conditions for the numerical simulation of waves[J].Acta Numerica,1999,8:47-106.
[11]I DRISS I M,SEED H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundation Division,1968,94(4):1003-1031.
[12]邱流潮,金峰.地震分析中人工边界处理与地震动输入方法研究[J].岩土力学,2006,27(9):1501-1504.QIU Liu-chao,JIN Feng.Study of method of earthquake input and artificial boundary conditions for seismic soil-structure interaction analysis[J].Rock and Soil Mechanics,2006,27(9):1501-1504.
[13]李建波,林皋,朱秀云,等.核电厂楼层谱抗震计算的场地模型及其影响分析[J].核动力工程,2010,31(4):91-95.LI Jian-bo,LIN Gao,ZHU Xiu-yun,et al.Study on ground numerical models for floor response spectra analysis of nuclear power plant and their influences[J].Nuclear Power Engineering,2010,31(4):91-95.
[2]赵杰,金煜皓,王桂萱.田湾核电站5、6号机组常规岛主厂房结构抗震性能分析[J].工程抗震与加固改造,2014,36(6):89-94.ZHAO Jie,JIN Yu-hao,WANG Gui-xuan.Structural dynamic antiseismic performance analysis on the main machine hall in conventional island of Tianwan nuclear power station unit S,6[J].Earthquake Resistant Engineering and Retrofitting,2014,36(6):89-94.
[3]尹训强,袁文志,王桂萱.复杂非均质场地条件下核电厂HPX泵房的静动力联合分析[J].岩土力学,2016,37(增刊2):745-752.YIN Xun-qiang,YUAN Wen-zhi,WANG Gui-xuan.Static-dynamic coupling analysis of pumping station of nuclear power plant under complicated heterogeneous site condition[J].Rock and Soil Mechanics,2016,37(Supp.2):745-752.
[4]李小军,侯春林,戴志军,等.核岛结构设计地基场地及计算基底效应研究[J].岩土力学,2015,36(8):2202-2208.LI Xiao-jun,HOU Chun-lin,DAI Zhi-jun,et al.Research on site effects of soil layers and bedrock on designing the foundation of nuclear island structure[J].Rock and Soil Mechanics,2015,36(8):2202-2208.
[5]金煜皓,尹训强,王桂萱.不同地基条件对核岛厂房结构地震响应的影响[J].华侨大学学报(自然科学版),2015,36(6):711-715.JIN Yu-hao,YIN Xun-qiang,WANG Gui-xuan.Effects of different ground conditions on seismic response of nuclear island[J].Journal of Huaqiao University(Natural Sciences),2015,36(6):711-715.
[6]艾智勇,蔡建邦.层状地基上弹性地基梁的有限元-边界元耦合分析[J].岩土力学,2015,36(增刊2):686-688.AI Zhi-yong,CAI Jian-bang.FEM/BEM coupling analysis of elastic foundation beam on layered soils[J].Rock and Soil Mechanics,2015,36(Supp.2):686-688.
[7]陈灯红,杜成斌.结构-地基动力相互作用的时域模型[J].岩土力学,2014,35(4):1165-1172.CHEN Deng-hong,DU Cheng-bin.A computational model for structure-foundation dynamic interaction in time domain[J].Rock and Soil Mechanics,2014,35(4):1165-1172.
[8]SONG C,WOLF J P.Dynamic stiffness of unbounded medium based on damping solvent extraction[J].Earthquake Engineering Structure Dynamic,1994,23(2):169-181.
[9]卢华喜,梁平英,尚守平.地基非线性波动问题中黏-弹性人工边界研究[J].岩土力学,2008,29(7):1911-1916.LU Hua-xi,LIANG Ping-ying,SHANG Shou-ping.Research on viscoelastic artificial boundary for problem of nonlinear wave motion in soil[J].Rock and Soil Mechanics,2008,29(7):1911-1916.
[10]HAGSTROM T.Radiation boundary conditions for the numerical simulation of waves[J].Acta Numerica,1999,8:47-106.
[11]I DRISS I M,SEED H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundation Division,1968,94(4):1003-1031.
[12]邱流潮,金峰.地震分析中人工边界处理与地震动输入方法研究[J].岩土力学,2006,27(9):1501-1504.QIU Liu-chao,JIN Feng.Study of method of earthquake input and artificial boundary conditions for seismic soil-structure interaction analysis[J].Rock and Soil Mechanics,2006,27(9):1501-1504.
[13]李建波,林皋,朱秀云,等.核电厂楼层谱抗震计算的场地模型及其影响分析[J].核动力工程,2010,31(4):91-95.LI Jian-bo,LIN Gao,ZHU Xiu-yun,et al.Study on ground numerical models for floor response spectra analysis of nuclear power plant and their influences[J].Nuclear Power Engineering,2010,31(4):91-95.