公路减隔震桥梁的地震反应简化分析
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摘要
采用单自由度反应谱方法对满足一定条件的减隔震桥梁进行地震反应分析可以简化计算过程,但需要解决精度问题。针对规范反应谱阻尼修正方法对计算精度的影响进行了分析并提出了改进方法。为了验证改进方法的合理性,对一座常规减隔震桥梁分别采用不同计算方法进行了比较分析,结果表明采用改进的阻尼修正公式后,简化反应谱方法的计算精度得到很大提高,且结果偏于安全。
When using the single-degree-of-freedom( SDOF) response spectrum method to analyze the seismic response of some isolated bridges,it can simplify the calculation process. However,it needs to improve the accuracy in engineering as well. In this paper,the effects of the modification method for response spectrum damping on computation accuracy are analyzed and improvements are proposed. Specially,the objective is to aim at the seismic design code for highway bridges. In order to verify reasonability of the improved method,different methods are used to analyze earthquake responses of a regular bridge with isolation bearings. The results indicated that based on the improved damping modification formula,the calculation precision of the simplified SDOF response spectrum method is greatly increased and the computational results are safer.
When using the single-degree-of-freedom( SDOF) response spectrum method to analyze the seismic response of some isolated bridges,it can simplify the calculation process. However,it needs to improve the accuracy in engineering as well. In this paper,the effects of the modification method for response spectrum damping on computation accuracy are analyzed and improvements are proposed. Specially,the objective is to aim at the seismic design code for highway bridges. In order to verify reasonability of the improved method,different methods are used to analyze earthquake responses of a regular bridge with isolation bearings. The results indicated that based on the improved damping modification formula,the calculation precision of the simplified SDOF response spectrum method is greatly increased and the computational results are safer.
引文
[1]中华人民共和国交通运输部.JTG/T B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.Ministry of Transport of P.R.China.JTG/T B02-01-2008guidelines for seismic design of highway bridge[S].Beijing:China Communications Press,2008.
[2]American Association of State Highway and Transportation Officials.AASHTO LRFD bridge design specification[S].4th Ed.Washington DC:AASHTO Publication Staff,2007.
[3]中华人民共和国住房和城乡建设部.CJJ 166-2011城市桥梁抗震设计规范[S].北京:中国工业建筑出版社,2011.Ministry of Housing and Urban-Rural Development of P.R.China.CJJ 166-2011 code for seismic design of urban bridges[S].Beijing:China Architecture&Building Press,2011.
[4]马东辉,李虹,苏经宇,等.阻尼比对设计反应谱的影响分析[J].工程抗震,1995(4):35-40.MA Donghui,LI Hong,SU Jingyu,et al.Analysis of effect of damping ratio on response spectrum for design[J].Earthquake Engineering,1995(4):35-40.
[5]周雍年,周正华,于海英.设计反应谱长周期区段的研究[J].地震工程与工程振动,2004,24(2):15-18.ZHOU Yongnian,ZHOU Zhenghua,YU Haiying.A study on long period portion of design spectre[J].Earthquake Engineering and Engineering Vibration,2004,24(2):15-18.
[6]胡聿贤.地震工程学[M].北京:地震出版社,2006:135-138.HU Yuxian.Earthquake engineering[M].Beijing:Seismological Press,2006:135-138.
[7]LIN Yuyuan,CHANG Kuochung.Study on damping reduction factor for building under earthquake ground motions[J].Journal of Structural Engineering,2003,129(2):206-214.
[8]LIN Yuyuan,TSAI Menghao,CHANG Kuochung.On the discussion of the damping reduction factors in the constant acceleration region for ATC-40 and FEMA 273[J].Earthquake Spectra,2003,19(4):1001-1006.
[9]LIN Yuyuan,EDUARDO M,CHANG Kuochung.Evalution of damping reduction factors for estimating elastic response of structures with high damping[J].Earthquake Engineering and Structural Dynamics,2005,34(11):1427-1443.
[10]罗开海,王亚勇.关于不同阻尼比反应谱的研究[J].建筑结构,2011,41(11):16-21.LUO Kaihai,WANG Yayong.Researches about the response spectra with different damping ratio[J].Building Structure,2011,41(11):16-21.
[11]叶爱君,管仲国.桥梁抗震[M].北京:人民交通出版社,2011.YE Aijun,GUAN Zhongguo.Seismic design for highway bridge[M].Beijing:China Communications Press,2011.
[2]American Association of State Highway and Transportation Officials.AASHTO LRFD bridge design specification[S].4th Ed.Washington DC:AASHTO Publication Staff,2007.
[3]中华人民共和国住房和城乡建设部.CJJ 166-2011城市桥梁抗震设计规范[S].北京:中国工业建筑出版社,2011.Ministry of Housing and Urban-Rural Development of P.R.China.CJJ 166-2011 code for seismic design of urban bridges[S].Beijing:China Architecture&Building Press,2011.
[4]马东辉,李虹,苏经宇,等.阻尼比对设计反应谱的影响分析[J].工程抗震,1995(4):35-40.MA Donghui,LI Hong,SU Jingyu,et al.Analysis of effect of damping ratio on response spectrum for design[J].Earthquake Engineering,1995(4):35-40.
[5]周雍年,周正华,于海英.设计反应谱长周期区段的研究[J].地震工程与工程振动,2004,24(2):15-18.ZHOU Yongnian,ZHOU Zhenghua,YU Haiying.A study on long period portion of design spectre[J].Earthquake Engineering and Engineering Vibration,2004,24(2):15-18.
[6]胡聿贤.地震工程学[M].北京:地震出版社,2006:135-138.HU Yuxian.Earthquake engineering[M].Beijing:Seismological Press,2006:135-138.
[7]LIN Yuyuan,CHANG Kuochung.Study on damping reduction factor for building under earthquake ground motions[J].Journal of Structural Engineering,2003,129(2):206-214.
[8]LIN Yuyuan,TSAI Menghao,CHANG Kuochung.On the discussion of the damping reduction factors in the constant acceleration region for ATC-40 and FEMA 273[J].Earthquake Spectra,2003,19(4):1001-1006.
[9]LIN Yuyuan,EDUARDO M,CHANG Kuochung.Evalution of damping reduction factors for estimating elastic response of structures with high damping[J].Earthquake Engineering and Structural Dynamics,2005,34(11):1427-1443.
[10]罗开海,王亚勇.关于不同阻尼比反应谱的研究[J].建筑结构,2011,41(11):16-21.LUO Kaihai,WANG Yayong.Researches about the response spectra with different damping ratio[J].Building Structure,2011,41(11):16-21.
[11]叶爱君,管仲国.桥梁抗震[M].北京:人民交通出版社,2011.YE Aijun,GUAN Zhongguo.Seismic design for highway bridge[M].Beijing:China Communications Press,2011.
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