脉冲型地震动作用下大跨输煤栈桥的动力响应
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摘要
为研究近断层脉冲效应对火力发电厂钢结构输煤栈桥地震响应的影响,以某典型输煤栈桥结构为研究对象,采用基于能量的脉冲地震动识别方法,选取9条不同脉冲周期的近断层脉冲型地震动,利用标准脉冲数学模型的方法,剔除所选地震动中的脉冲成分,从而获得相应的9条非脉冲地震动。在此基础上,采用动力时程分析方法,对比脉冲地震动与非脉冲地震动对该典型输煤栈桥结构地震响应的影响。研究结果表明:脉冲型地震动会对输煤栈桥的地震响应产生显著影响,特别是脉冲周期与结构自振周期接近时,三向输入时脉冲效应对输煤栈桥结构响应的放大作用最明显,其最大放大系数为2.1;在脉冲型地震作用下,输煤栈桥的柱顶水平位移为弹塑性位移限值的1.36倍,将产生超出预期的严重破坏,其钢桁架跨中挠度为正常使用限值的2.97倍,将会严重影响结构的适用性及附属设备的安全。因此,在对近断层区域内的输煤栈桥结构进行抗震设计时,有必要考虑脉冲效应和地震动多维性对结构地震响应的影响,否则将低估结构的动力响应。
To study the pulse effect on the seismic response of steel coal-conveyer gallery in thermal power plant,dynamic analysis of a typical coal-conveyer gallery structure was carried out in this paper.Firstly,the energy-based pulse-like ground motion identification method was adopted to select nine ground motions with different pulse periods.Secondly,the corresponding ground motions without pluses were obtained by using standard mathematical pulse model to remove the pulses from the selected pulse-like ground motions,and then,a comparative analysis was conducted considering the ground motions with and without pulses.Results show that pulse-like ground motions can significantly affect the structural responses,especially when the pulse period is close to the fundamental period of the structure.The pulse effect on the responses of coal-conveyer gallery is most obvious when the three-direction input is used,and the maximum value of amplification factor is 2.1.Under the pulse-like ground motions,the displacements of column top is 1.36 times of the elastoplastic displacement limit,which will cause serious damage beyond expectations.The mid-span deflection of steel truss is 2.97 times of the serviceability limit,which may adversely affect the serviceability of the structure and the safety of the attached equipment.Therefore,in seismic design,to avoid misleading estimates of the responses of structure,it is suggested that the pulse effect and the multidimensional input should be considered cautiously for the coal-conveyer gallery in the neat fault region.
To study the pulse effect on the seismic response of steel coal-conveyer gallery in thermal power plant,dynamic analysis of a typical coal-conveyer gallery structure was carried out in this paper.Firstly,the energy-based pulse-like ground motion identification method was adopted to select nine ground motions with different pulse periods.Secondly,the corresponding ground motions without pluses were obtained by using standard mathematical pulse model to remove the pulses from the selected pulse-like ground motions,and then,a comparative analysis was conducted considering the ground motions with and without pulses.Results show that pulse-like ground motions can significantly affect the structural responses,especially when the pulse period is close to the fundamental period of the structure.The pulse effect on the responses of coal-conveyer gallery is most obvious when the three-direction input is used,and the maximum value of amplification factor is 2.1.Under the pulse-like ground motions,the displacements of column top is 1.36 times of the elastoplastic displacement limit,which will cause serious damage beyond expectations.The mid-span deflection of steel truss is 2.97 times of the serviceability limit,which may adversely affect the serviceability of the structure and the safety of the attached equipment.Therefore,in seismic design,to avoid misleading estimates of the responses of structure,it is suggested that the pulse effect and the multidimensional input should be considered cautiously for the coal-conveyer gallery in the neat fault region.
引文
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[17]火力发电厂土建结构设计技术规程:DL 5022-2012[S].北京:中国计划出版社,2012.Technical code for the design of civil structure of fossilfired power plant:DL 5022-2012[S].Beijing:China Planning Press,2012.(in Chinese)
[18]CHANG Z W,SUN X D,ZHAI C H.An improved energy-based approach for selecting pulse-like ground motions[J].Earthquake Engineering&Structural Dynamics,2016,45(14):2405-2411.
[19]ZHAI C H,CHANG Z W,LI S,et al.Quantitative identification of near-fault pulse-like ground motions based on energy[J].Bulletin of the Seismological Society of America,2013,103(5):2591-2603.
[20]田晴,赵崇锦,王忠凯,等.新疆某超高层住宅楼动力弹塑性分析[J].土木建筑与环境工程,2016,38(Sup2):30-34.TIAN Q,ZHAO C J,WANG Z K,et al.Elastic and plastic dynamic analysis of a super high-rise residential building in Xinjiang[J].Journal of Civil,Architectural&Environmental Engineering,2016,38(Sup2):30-34.(in Chinese)
[21]DICKINSON B W,GAVIN H P.Parametric statistical generalization of uniform-hazard earthquake ground motions[J].Journal of Structural Engineering,2011,137(3):410-422.
[22]建筑抗震设计规范:GB 50011-2010[S].北京:中国建筑工业出版社,2016.Code for seismic design of building:GB 50011-2010[S].Beijing:China Architecture&Building Press,2016.(in Chinese)
[2]高剑,王忠凯,潘毅,等.罕遇地震下石化钢结构减震的关键影响因素[J].土木建筑与环境工程,2016,38(1):92-99.GAO J,WANG Z K,PAN Y,et al.Influence factors of vibration reduction in petrochemical steel structure under rare earthquake[J].Journal of Civil,Architectural&Environmental Engineering,2016,38(1):92-99.(in Chinese)
[3]丁光莹,李杰.多点非一致激励长跨结构抗震可靠度分析[J].世界地震工程,2000,16(3):84-89.DING G Y,LI J.Aseismatic reliability analysis of the long-span multiply supported structures subjected to non-uniform seismic excitation[J].World Earthquake Engineering,2000,16(3):84-89.(in Chinese)
[4]金联社,张欲晓,秦素娟.超大跨度输煤栈桥的竖向地震及温度计算[J].武汉大学学报(工学版),2010,43:128-131.JIN L S,ZHANG Y X,QIN S J.Vertical seism and temperature calculation of super-large span coal handling trestle[J].Engineering Journal of Wuhan University,2010,43:128-131.(in Chinese)
[5]李正坤,李晓文,孙晓岭,等.超大跨长距离输煤栈桥考虑地震动行波效应影响分析研究[J].水利与建筑工程学报,2011,9(2):126-132.LI Z K,LI X W,SUN X L,et al.Analysis and study for impact on long-span coal transport belt-conveyor gallery across long-distance when considering wave-traveling effect of seismic motion[J].Journal of Water Resources and Architectural Engineering,2011,9(2):126-132.(in Chinese)
[6]刘厚营,李晓文,李正坤,等.连续大跨输煤栈桥在不同地震强度下的时程分析[J].水利与建筑工程学报,2012,10(4):78-82.LIU H Y,LI X W,LI Z K,et al.Seismic time-history analysis for consecutive large-span coal transport trestle under different earthquake intensity[J].Journal of Water Resources and Architectural Engineering,2012,10(4):78-83.(in Chinese)
[7]李峰,闫芳芳,白韬,等.大跨度输煤钢结构栈桥模态及竖向地震响应[J].西安科技大学学报,2013,33(5):549-553.LI F,YAN F F,BAI T,et al.Modal and vertical seismic response analysis of long-span steel structure for coal-conveyer gallery[J].Journal of Xi’an University of Science and Technology,2013,33(5):549-553.(in Chinese)
[8]吴王平,刘书贤,刘书会,等.强震作用下大跨度钢筋混凝土输煤栈桥抗震性能研究[J].建筑结构学报,2018,39(4):74-81.WU W P,LIU S X,LIU S H,et al.Seismic performance of large span RC coal trestle under strong earthquakes[J].Journal of Building Structures,2018,39(4):74-81.(in Chinese)
[9]WANG G Q,ZHOU X Y,ZHANG P Z,et al.Characteristics of amplitude and duration for near fault strong ground motion from the 1999Chi-Chi,Taiwan Earthquake[J].Soil Dynamics&Earthquake Engineering,2002,22(1):73-96.
[10]LI X,ZHOU Z,HUANG M,et al.Preliminary analysis of strong-motion recordings from the magnitude 8.0Wenchuan,China,Earthquake of 12 May 2008[J].Seismological Research Letters,2008,79(6):844-854.
[11]潘毅,张弛,高宪,等.台湾美浓6.7级地震框架结构震害调查与分析[J].土木工程学报,2016,49(Sup1):13-18.PAN Y,ZHANG C,GAO X,et al.Earthquake damage investigation and analysis of the RC frame structures in Taiwan Meinung MS 6.7earthquake[J].China Civil Engineering Journal,2016,49(Sup1):13-18.(in Chinese)
[12]潘毅,胡思远,郭瑞,等.台湾花莲6.5级地震工程结构震害调查与分析[M].北京:中国建材工业出版社,2018:57-63.PAN Y,HU S Y,GUO R,et al.Seismic damage investigation and analysis of engineering structures in Taiwan Hualien MS 6.5earthquake[M].Beijing:China Building Materials Industry Press,2018:57-63.(in Chinese)
[13]KALKAN E,KUNNATH S K.Effects of fling step and forward directivity on seismic response of buildings[J].Earthquake Spectra,2012,22(2):367-390.
[14]潘毅,江赛雄,唐丽娜.西部山区输电塔震害调查及抗震设计研究[M].北京:中国建材工业出版社,2014:225-229.PAN Y,JIANG S X,TANG L N.Seismic damage investigation and design analysis of transmission tower in western China mountain areas[M].Beijing:China Building Materials Industry Press,2014:225-229.(in Chinese)
[15]张治勇,刘殿魁,孙柏涛,等.火力发电厂抗震研究概况[J].世界地震工程,1999,15(1):34-40.ZHANG Z Y,LIU D K,SUN B T,et al.Summary of seismic research of thermal power plant[J].World Earthquake Engineering,1999,15(1):34-40.(in Chinese)
[16]杨文忠.唐山大地震与建筑抗震[M].成都:西南交通大学出版社,2003.YANG W Z.Tangshan earthquake and the seismic design of building[M].Chengdu:Southwest Jiaotong University Press,2003.(in Chinese)
[17]火力发电厂土建结构设计技术规程:DL 5022-2012[S].北京:中国计划出版社,2012.Technical code for the design of civil structure of fossilfired power plant:DL 5022-2012[S].Beijing:China Planning Press,2012.(in Chinese)
[18]CHANG Z W,SUN X D,ZHAI C H.An improved energy-based approach for selecting pulse-like ground motions[J].Earthquake Engineering&Structural Dynamics,2016,45(14):2405-2411.
[19]ZHAI C H,CHANG Z W,LI S,et al.Quantitative identification of near-fault pulse-like ground motions based on energy[J].Bulletin of the Seismological Society of America,2013,103(5):2591-2603.
[20]田晴,赵崇锦,王忠凯,等.新疆某超高层住宅楼动力弹塑性分析[J].土木建筑与环境工程,2016,38(Sup2):30-34.TIAN Q,ZHAO C J,WANG Z K,et al.Elastic and plastic dynamic analysis of a super high-rise residential building in Xinjiang[J].Journal of Civil,Architectural&Environmental Engineering,2016,38(Sup2):30-34.(in Chinese)
[21]DICKINSON B W,GAVIN H P.Parametric statistical generalization of uniform-hazard earthquake ground motions[J].Journal of Structural Engineering,2011,137(3):410-422.
[22]建筑抗震设计规范:GB 50011-2010[S].北京:中国建筑工业出版社,2016.Code for seismic design of building:GB 50011-2010[S].Beijing:China Architecture&Building Press,2016.(in Chinese)