动力分析实测强震加速度时域选取的优化算法
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摘要
为缩短强震台监测的加速度时程动力分析时间,提出了加速度时域选取的优化算法.首先,运用希尔伯特-黄变换求得实测加速度能量在时域内的表达形式;然后,根据能量时程曲线,以保留总能量95%为基准,对低能量时段进行过滤;最后,对非低能量时段进行拼接处理,得到优化加速度时程.将该优化算法运用于"5.12"汶川地震卧龙台所测强震加速度数据,可将实测的160s时程优化为42.57s.将优化加速度时程用于动力分析,对位于汶川地震最高影响烈度区内的地下结构进行计算,计算结果可捕捉到所有应力和变形极值以及变幅较大的时段,且应力极值和残余值精度较高.
To reduce the time spent on dynamic analysis,the optimization algorithm for time domain selection of measured acceleration was put forward.Firstly,the time domain expression of the energy of measured acceleration was figured out by employing Hilbert-Huang transform.Then based on the energy curve the low energy periods were filtered by reserving 95% of total energy.Finally,by splicing the non-low energy periods,the optimized time history of acceleration was obtained.The proposed algorithm was employed to optimize the measured acceleration data derived from Wolong strong motion station in "5.12" Wenchuan earthquake.It was discovered that the time duration was reduced from the measured 160 s to optimized 42.57 s.The optimized acceleration data was further employed to conduct dynamic analysis towards an underground cavern complex,located in the highest response intensity zone of Wenchuan earthquake.The result shows that by using the optimized acceleration data,not only all the periods with large magnitudes of stress and deformation are reflected,but also the accuracy is guaranteed.
To reduce the time spent on dynamic analysis,the optimization algorithm for time domain selection of measured acceleration was put forward.Firstly,the time domain expression of the energy of measured acceleration was figured out by employing Hilbert-Huang transform.Then based on the energy curve the low energy periods were filtered by reserving 95% of total energy.Finally,by splicing the non-low energy periods,the optimized time history of acceleration was obtained.The proposed algorithm was employed to optimize the measured acceleration data derived from Wolong strong motion station in "5.12" Wenchuan earthquake.It was discovered that the time duration was reduced from the measured 160 s to optimized 42.57 s.The optimized acceleration data was further employed to conduct dynamic analysis towards an underground cavern complex,located in the highest response intensity zone of Wenchuan earthquake.The result shows that by using the optimized acceleration data,not only all the periods with large magnitudes of stress and deformation are reflected,but also the accuracy is guaranteed.
引文
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[19]王如宾,徐卫亚,石崇,等.高地震烈度区岩体地下洞室动力响应分析[J].岩石力学与工程学报,2009,28(3):568-575.
[2]谢礼立,马玉宏,翟长海.基于性态的抗震设防与设计地震动[M].北京:科学出版社,2009.
[3]谢礼立,周雍年.一个新的地震动持续时间的定义[J].地震工程与工程振动,1984,4(2):27-35.
[4]谢礼立,张晓志.地震动记录持时与工程持时[J].地震工程与工程振动,1988,8(1):31-38.
[5]Trifunac M D,Brady A G.A study on the durationof strong earthquake ground motion[J].Bulletin ofthe Seismological Society of America,1975,65(3):581-626.
[6]李夕兵,凌同华,张义平.爆破震动信号分析理论与技术[M].北京:科学出版社,2009.
[7]张贤达,保铮.非平稳信号分析与处理[M].北京:国防工业出版社,1998.
[8]Huang N E,Shen Z,long S R,et al.The empiricalmode decomposition and the Hilbert spectrum fornonlinear and nonstationary time series analysis[J].Proceedings of Royal Society London A,1998,A454:903-995.
[9]公茂盛,谢礼立.结构地震反应记录的HHT分析[J].西安建筑科技大学学报:自然科学版,2006,38(4):450-454.
[10]张义平,李夕兵,赵国彦,等.爆破震动信号的时频分析[J].岩土工程学报,2005,27(12):1472-1477.
[11]楼梦麟,黄天立.正交化经验模式分解方法[J].同济大学学报:自然科学版,2007,35(3):293-298.
[12]郑声安,王仁坤,章建跃,等.汶川地震对岷江上游水电工程的影响[J].水力发电,2008,34(11):5-9.
[13]张雨霆,肖明,李玉婕.汶川地震对映秀湾水电站地下厂房的震害影响及动力响应分析[J].岩石力学与工程学报,2010,29(S2):3663-3671.
[14]中国地震局中华人民共和国行业标准.GB 17741—2005工程场地地震安全性评价技术规范[S].北京:中国标准出版社,2005.
[15]Li Xiaojun,Zhou Zhenghua,Huang M,et al.Pre-liminary analysis of strong-motion recordings fromthe magnitude 8.0Wenchuan,China,earthquake of12May 2008[J].Seismological Research Letters,2008,79(6):844-854.
[16]陈厚群,徐泽平,李敏.汶川大地震和大坝抗震安全[J].水利学报,2008,39(10):1158-1167.
[17]中国水利水电科学研究院.DL 5073-2000水工建筑物抗震设计规范[S].北京:中国电力出版社,2006.
[18]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[19]王如宾,徐卫亚,石崇,等.高地震烈度区岩体地下洞室动力响应分析[J].岩石力学与工程学报,2009,28(3):568-575.
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