地形效应对于核电场地地震反应分析影响研究
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摘要
目前,在进行核电场地安全性评价时,主要采用一维等效线性化程序LSSRLI-1,而一维等效线性化方法在考虑地形效应时有很大的局限性,特别是在研究场地地形效应的影响时偏差较大。对于抗震设计要求远高于一般建筑的核电站来说,选用合适的方法进行二维建模分析是非常必要的。选取了某核电场地典型剖面15个钻孔资料,在MIDAS二维等效线性分析环境下进行了建模,并选取了以年超越概率10~(-4)合成的地震动中10条最大样本时程作为基底输入进行分析。通过与LSSRLI-1的计算结果进行对比,研究了地形效应对地表和核岛基础处(8. 5m)加速度反应谱的影响,并提出了设计建议。分析得出:二维分析中地形效应对地表加速度最大值反应谱的双峰形态影响较大,并且计算结果对AP1000谱的超越情况有所变化;对核岛基础处(8. 5m)峰值加速度的影响程度比地表要小,没有表现双峰形态变化较大的形态。
At present,one-dimensional equivalent linearization program LSSRLI-1 is mainly used in the seismic safety evaluation of sites of nuclear power plants,but the program has great limitations when considering topographic effect,especially,has a large deviation in studying site topographic effect. For nuclear power plants whose seismic design standard is much higher than that of general buildings,it is very necessary to choose an appropriate method for two-dimensional modeling and analysis. 15 borehole data from sites of a typical nuclear power plant were selected for modeling in the two-dimensional equivalent linearization analysis environment of MIDAS,and 10 acceleration time histories synthesized based on annual exceeding probability 10~(-4) were selected as the base input for analysis. By comparing with the calculation results of LSSRLI-1,the influence of topographic effect on the acceleration response spectra of ground surface and nuclear island foundation( 8. 5 m) was studied,and the design suggestions were proposed. The results are as follows. The topographic effect has a great influence on the double peak shape of the acceleration response spectra in the two-dimensional program,and the calculation results have changedthe exceeding situation of AP1000 spectrum. The peak acceleration at the base of the nuclear island foundation( 8. 5 m) is less affected than that at the ground surface,and there is no obvious variation in the double peak shape.
At present,one-dimensional equivalent linearization program LSSRLI-1 is mainly used in the seismic safety evaluation of sites of nuclear power plants,but the program has great limitations when considering topographic effect,especially,has a large deviation in studying site topographic effect. For nuclear power plants whose seismic design standard is much higher than that of general buildings,it is very necessary to choose an appropriate method for two-dimensional modeling and analysis. 15 borehole data from sites of a typical nuclear power plant were selected for modeling in the two-dimensional equivalent linearization analysis environment of MIDAS,and 10 acceleration time histories synthesized based on annual exceeding probability 10~(-4) were selected as the base input for analysis. By comparing with the calculation results of LSSRLI-1,the influence of topographic effect on the acceleration response spectra of ground surface and nuclear island foundation( 8. 5 m) was studied,and the design suggestions were proposed. The results are as follows. The topographic effect has a great influence on the double peak shape of the acceleration response spectra in the two-dimensional program,and the calculation results have changedthe exceeding situation of AP1000 spectrum. The peak acceleration at the base of the nuclear island foundation( 8. 5 m) is less affected than that at the ground surface,and there is no obvious variation in the double peak shape.
引文
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[17]霍俊荣,胡聿贤.地震动峰值参数衰减规律的研究[J].地震工程与工程振动,1992,12(2):1-11.HUO Junrong,HU Yuxian. Study on attenuation laws of ground motion parameters[J]. Journal of Earthquake Engineering and Engineering Vibration,1992,12(2):1-11.(in Chinese)
[18]李尔超.强度包络函数参数不确定性对土层地震反应影响研究[D].哈尔滨:中国地震局工程力学研究所,2015.LI Erchao. Influence of uncertainty of intensity envelope function’parameters on soil layers seismic response[D]. Harbin:Institute of Engineering Mechanics,China Earthquake Administration. 2015.(in Chinese)
[19]苏亮,王毅.等效线性化方法中系统参数求解的优化算法[J].工程力学,2011,9(28):23-29.SU Liang,WANG Yi. New optimization algorithm for determining system parameters of equivalent linearization method[J]. Engineering Mechanics,2011,9(28):23-29.(in Chinese)
[2]王笃国.场地地震动及其非线性地震反应和大跨桥梁地震反应分析[D].北京:北京交通大学,2016.WANG Duguo. Study on the input motion for the site and nonlinear site response and seismic response of long-span structures[D]. Beijing:Beijing Jiaotong University,2016.(in Chinese)
[3]聂春晓.场地动力特性的地形效应研究[D].成都:西南交通大学,2013.NIE Chunxiao. The research of site dynamic effects on topography[D]. Chengdu:Southwest Jiaotong University,2013.(in Chinese)
[4]李小军,廖振鹏.土应力应变关系的粘-弹-塑模型[J].地震工程与工程振动,1989,9(3):65-72.LI Xiaojun,LIAO Zhenpeng. Visco-elasto-plastic model of soil stress-strain relationship[J]. Journal of Earthquake Engineering and Engineering Vibration,1989,9(3):65-72.(in Chinese)
[5]李小军.一维土层地震反应分析线性化计算程序[M].地震小区划—理论与实践,北京:地震出版社,1989.LI Xiaojun. A Computer Program for Calculating Earthquake Response of Ground Layered Soil[M]. Seismic Microzonation,Beijing:Seismological Press,1989.(in Chinese)
[6]李小军.土动本构关系的一种简单函数表达式[J],岩土工报,1992,14(5):90-94.LI Xiaojun. A simple functional expression for the constitutive relation of soil motion[J]. Chinese Journal of Geotechnical Engineering,1992,14(5):90-94.(in Chinese)
[7]赵丙华.基于有限元—无限元耦合法的半无限土动力响应分析[D].北京:北京交通大学,2012.ZHAO Binghua. Dynamic analysis of semi-infinite soil based on finite-element and Infinite-element coupling method[D]. Beijing:Beijing Jiaotong University,2102(in Chinese).
[8]李煜东.基于ABAQUS的场地地震反应分析[D].廊坊:防灾科技学院,2016.LI Yudong. Site seismic repsonse analysis based on ABAQUS[D]. Langfang:Institute of Disaster Prevention Science and Technology,2016.(in Chinese)
[9]谷音,刘晶波,杜义欣.三维一致粘弹性人工边界及等效粘弹性边界单元[J].工程力学,2007(12):31-37.GU Yin,LIU Jingbo,DU Yixin. 3D consistent viscous-spring artificial boundary and viscous-spring boundary element[J]. Engineering Mechanics,2007(12):31-37.(in Chinese)
[10]马怀发,王立涛,陈厚群.粘弹性人工边界的虚位移原理[J].工程力学,2013,30(1):168-174.MA Huaifa,WANG Litao,CHEN Houqun. Principle of virtual displacements of viscous-spring artificial boudaries[J]. Engineering Mechanics,2013,30(1):168-174.(in Chinese)
[11]刘晶波,谷音,杜义欣.一致粘弹性人工边界及粘弹性边界单元[J].岩土工程学报,2006,28(9):1070-1075.LIU Jingbo,GU Yin,DU Yixin. Consistent viscous-spring artificial boundaries and viscous-spring boundary elements[J]. Journal of Geotechnical Engineering,2006,28(9):1070-1075.(in Chinese)
[12]马怀发,王立涛,陈厚群.粘弹性人工边界的虚位移原理[J].工程力学,2013,30(1):168-174.MA Huaifa,WANG Litao,CHEN Houqun. Principle of virtual displacements of viscous-spring artificial boundaries[J]. Engineering Mechanics,2013,30(1):168-174.(in Chinese)
[13]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.WU Shiming. Soil Dynamics[M]. Beijing:China Architecture and Building Press,2000.(in Chinese)
[14]河北某核电厂可行性研究阶段工程场地地震安全性评价[R].北京:中国地震局地质研究所. 2014.Seismic safety evaluation of site of feasibility study phase of a nuclear power plant in Hebei[R]. Beijing:Institute of geology,China Earthquake Administration. 2014.(in Chinese)
[15] GB 50267-97.核电厂抗震设计规范[S].北京:国家地震局,1997.GB 50267-97. Code for Seismic Design of Nuclear Power Plants[S]. Beijing:China Earthquake Administration,1997.(in Chinese)
[16]卢寿德. GB17741-2005《工程场地地震安全性评价》宣贯教材[M].北京:标准出版社,2006LU Shoude. GB17741-2005"Seismic Safety Evaluation of Engineering Site"Teaching Material[M]. Beijing:Standard Press,2006.(in Chinese)
[17]霍俊荣,胡聿贤.地震动峰值参数衰减规律的研究[J].地震工程与工程振动,1992,12(2):1-11.HUO Junrong,HU Yuxian. Study on attenuation laws of ground motion parameters[J]. Journal of Earthquake Engineering and Engineering Vibration,1992,12(2):1-11.(in Chinese)
[18]李尔超.强度包络函数参数不确定性对土层地震反应影响研究[D].哈尔滨:中国地震局工程力学研究所,2015.LI Erchao. Influence of uncertainty of intensity envelope function’parameters on soil layers seismic response[D]. Harbin:Institute of Engineering Mechanics,China Earthquake Administration. 2015.(in Chinese)
[19]苏亮,王毅.等效线性化方法中系统参数求解的优化算法[J].工程力学,2011,9(28):23-29.SU Liang,WANG Yi. New optimization algorithm for determining system parameters of equivalent linearization method[J]. Engineering Mechanics,2011,9(28):23-29.(in Chinese)