基岩人造地震动随机数对地表地震动参数的影响
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摘要
随机数是人工合成基岩地震动输入的必备参数,对地表地震动参数有一定影响。以某实际化工工程场地剖面及其基岩加速度反应谱为基础,调整随机数,人工合成不同的基岩加速度时程,以此为输入,计算场地地表地震动参数,并对比不同随机数下地表加速度反应。对比结果表明,相同的场地和基岩反应谱输入,不同随机数对应得到的地表反应谱高频部分(<0.2s)影响显著,而对地表反应谱周期部分(>0.2s)影响不大,其中峰值加速度差别最为显著,输入地震动强度越大差别越大,大震输入下可达到60gal,有可能影响烈度判断结果。基岩人造地震动随机数主要影响峰值加速度和地表反应谱高频部分,基本不影响反应谱长周期部分。
Random number is a necessary parameter for artificial ground motion of the bed rock,it had a certain effect on the ground motion parameters. Base on a site profile and the acceleration response spectra of the bed rock which were chosen from a real engineering,different acceleration time histories were synthesized artificially using different random numbers,then the ground motion parameters were calculated of the site profile. After comparing the calculated parameters,some difference could be found as follows:( 1) the ground response spectra were not the same under the input acceleration wave synthesized according to same input response spectra but different random numbers,( 2) the difference was clear at high frequency parts( 0- 0. 2s) of the ground response spectra,especially for the peak ground acceleration,the main parts( > 0. 2s) of the ground response spectra were nearer.( 3)the difference became larger with the input motion intensity increasing,it could reach 60 gal for high level input motion,and it maybe lead to different judging results of seismic intensity. Random number mainly influences the peak ground accelerations but the main part of the spectra.
Random number is a necessary parameter for artificial ground motion of the bed rock,it had a certain effect on the ground motion parameters. Base on a site profile and the acceleration response spectra of the bed rock which were chosen from a real engineering,different acceleration time histories were synthesized artificially using different random numbers,then the ground motion parameters were calculated of the site profile. After comparing the calculated parameters,some difference could be found as follows:( 1) the ground response spectra were not the same under the input acceleration wave synthesized according to same input response spectra but different random numbers,( 2) the difference was clear at high frequency parts( 0- 0. 2s) of the ground response spectra,especially for the peak ground acceleration,the main parts( > 0. 2s) of the ground response spectra were nearer.( 3)the difference became larger with the input motion intensity increasing,it could reach 60 gal for high level input motion,and it maybe lead to different judging results of seismic intensity. Random number mainly influences the peak ground accelerations but the main part of the spectra.
引文
[1]刘红帅,薄景山,吴兆营,等.土体参数对地表加速度峰值和反应谱的影响[J].地震研究,2005(2):161-171.LIU Hongshuai,BO Jingshan,WU Zhaoying,et al.Effects of soil parameters on ground surface acceleration peak and response spectra[J].Journal of Seismological Research Mechanics,2005(2):161-171.(in Chinese)
[2]孙锐,袁晓铭,刘晓键.动剪切模量比与剪切波速对地震动影响及等量关系研究[J].岩土工程学报,2009,31(8):1267-1274.SUN Rui,YUAN Xiaoming,LIU Xiaojian.Effects of dynamic shear modulus ratio and velocity on surface ground motion and their equivalent relations[J].Chinese Journal of Geotechnical Engineering,2009,31(8):1267-1274.(in Chinese)
[3]王冲,薄景山,齐文浩,等.输入界面对地表加速度峰值得影响[J].地震工程与工程振动,2011,31(6):55-61.WANG Chong,BO Jingshan,QI Wenhao,et al.The effects of dynamic shear modulus ratio and velocity on surface ground motion and their equivalent relations[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(6):55-61.(in Chinese)
[4]卢寿德.GB17741-2005《工程场地地震安全性评价》宣贯教材[M].北京:中国标准出版社,2006.LU Shoude.Teaching material of GB17741-2005 Evaluation of seismic safety for engineering sites[S].Beijing:Standards Press of China,2006.(in Chinese)
[5]黑龙江科技有限公司.100万吨/年柴油加氢项目工程场地地震安全性评价报告[R].哈尔滨,2013.Heilongjiang Earthquake Engineering Technology Co.,ltd..Report of Evaluation of seismic safety for engineering sites of 1 million tons/year diesel hydrogenation project[R].Harbin,2013.(in Chinese)
[6]GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010Code for seismic design of buildings[S].Beijing:Building Industry Press of China,2010.(in Chinese)
[7]廖振鹏.地震小区划(理论与实践)[M].北京:地震出版社,1989.LIAO Zhenpeng.Seismic microzonation[M].Beijing:Seismological Press,1989.(in Chinese)
[2]孙锐,袁晓铭,刘晓键.动剪切模量比与剪切波速对地震动影响及等量关系研究[J].岩土工程学报,2009,31(8):1267-1274.SUN Rui,YUAN Xiaoming,LIU Xiaojian.Effects of dynamic shear modulus ratio and velocity on surface ground motion and their equivalent relations[J].Chinese Journal of Geotechnical Engineering,2009,31(8):1267-1274.(in Chinese)
[3]王冲,薄景山,齐文浩,等.输入界面对地表加速度峰值得影响[J].地震工程与工程振动,2011,31(6):55-61.WANG Chong,BO Jingshan,QI Wenhao,et al.The effects of dynamic shear modulus ratio and velocity on surface ground motion and their equivalent relations[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(6):55-61.(in Chinese)
[4]卢寿德.GB17741-2005《工程场地地震安全性评价》宣贯教材[M].北京:中国标准出版社,2006.LU Shoude.Teaching material of GB17741-2005 Evaluation of seismic safety for engineering sites[S].Beijing:Standards Press of China,2006.(in Chinese)
[5]黑龙江科技有限公司.100万吨/年柴油加氢项目工程场地地震安全性评价报告[R].哈尔滨,2013.Heilongjiang Earthquake Engineering Technology Co.,ltd..Report of Evaluation of seismic safety for engineering sites of 1 million tons/year diesel hydrogenation project[R].Harbin,2013.(in Chinese)
[6]GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010Code for seismic design of buildings[S].Beijing:Building Industry Press of China,2010.(in Chinese)
[7]廖振鹏.地震小区划(理论与实践)[M].北京:地震出版社,1989.LIAO Zhenpeng.Seismic microzonation[M].Beijing:Seismological Press,1989.(in Chinese)
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