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滑动屋盖摩擦控制系统对地震频谱和结构刚度的鲁棒性 被引量:2
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作者 田志昌 钱稼茹 《地震工程与工程振动》 CSCD 北大核心 2002年第3期111-114,共4页
地震功率谱密度函数的频率范围和结构刚度变化对滑动屋盖摩擦控制系统减震效果的影响分析表明 :控制系统减震效果对地震功率谱的频域宽窄不敏感 ,而对功率谱所覆盖的结构自振频率敏感 ;结构刚度发生± 15 %的变化对减震效果的影响... 地震功率谱密度函数的频率范围和结构刚度变化对滑动屋盖摩擦控制系统减震效果的影响分析表明 :控制系统减震效果对地震功率谱的频域宽窄不敏感 ,而对功率谱所覆盖的结构自振频率敏感 ;结构刚度发生± 15 %的变化对减震效果的影响不大。分析还表明 。 展开更多
关键词 滑动屋盖摩擦控制系统 结构刚度 鲁棒性 非线性反应 地震功率谱 减震效果
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大型储液罐的地震反应初探 被引量:4
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作者 王健 《压力容器》 北大核心 2008年第6期25-27,共3页
随着大型储液罐在石化工业的广泛应用,其震害分析变得极为重要。利用ANSYS软件在空锚固式储液模态分析的基础上,输入模拟的地震加速度反应谱,得出了横向地震力作用下的较为精确详尽的储罐响应结果,直观的再现了空储液罐在地震力作用下... 随着大型储液罐在石化工业的广泛应用,其震害分析变得极为重要。利用ANSYS软件在空锚固式储液模态分析的基础上,输入模拟的地震加速度反应谱,得出了横向地震力作用下的较为精确详尽的储罐响应结果,直观的再现了空储液罐在地震力作用下的受力情况和薄弱环节,从而为储液罐的设计提供了可靠的依据,为进一步分析大型储液罐充液状态时的地震反应起到抛砖引玉的作用。 展开更多
关键词 大型储液罐 模态分析 ANSYS软件 地震功率谱
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Research on Real-time Monitoring of Abnormal Seismic Noise 被引量:1
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作者 Lin Binhua Jin Xing +3 位作者 Liao Shirong Li Jun Huang Linzhu Chen Huifang 《Earthquake Research in China》 CSCD 2016年第2期224-232,共9页
The noise data in vertical component records of 85 seismic stations in Fujian Province during 2012 is used as the research object in this paper. The noise data is divided into fiveminute segments to calculate the powe... The noise data in vertical component records of 85 seismic stations in Fujian Province during 2012 is used as the research object in this paper. The noise data is divided into fiveminute segments to calculate the power spectra. The high reference line and low reference line of station are then identified by drawing a probability density function graph( PDF)using the power spectral probability density function. Moreover, according to the anomalies of PDF graphs in 85 seismic stations,the abnormal noise is divided into four categories: dropped packet, low noise, high noise, and median noise anomalies.Afterwards,four selection methods are found by the high or low noise reference line of the stations,and the system of real-time monitoring of seismic noise is formed by combining the four selection methods. Noise records of 85 seismic stations in Fujian Province in July2013 are selected for verification,and the results show that the anomalous noise-recognition system could reach a 90% success rate at most stations and the effect of selection are very good. Therefore,it could be applied to the seismic noise real-time monitoring in stations. 展开更多
关键词 Seismic noise Power spectral density Probability density function Powerspectrum Abnormity Data quality
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Discrete Wavelet Multi-scale Decomposition of the Temporal Gravity Variations in North China
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作者 Liu Fang Zhu Yiqing Chen Shi 《Earthquake Research in China》 2014年第3期360-369,共10页
On the basis of the absolute and relative gravity observations in North China,spatial dynamic variation of regional gravity fields is obtained. A multi-scale decomposition technique is used to separate anomalies at di... On the basis of the absolute and relative gravity observations in North China,spatial dynamic variation of regional gravity fields is obtained. A multi-scale decomposition technique is used to separate anomalies at different depths,and give some explanation to gravity variation at different time space scales. Gravity variation trends in North China are improved. Based on this result and the analysis of wavelet power spectrum,the images of the depth of wavelet approximation and detail are obtained. The results obtained are of scientific significance for the deep understanding of potential seismic risk in North China from gravity variations in different time space scales. 展开更多
关键词 Wavelet decomposition MULTI-SCALE Gravity variation field POWERSPECTRUM North China
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Use of probabilistic and deterministic measures to identify unfavorable earthquake records 被引量:2
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作者 Abbas MOUSTAFA Izuru TAKEWAKI 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第5期619-634,共16页
This study introduces measures to identify resonant (concentration of energy in a single or a few frequencies) or unfavorable earthquake ground motions. Probabilistic measures based on the entropy rate and the geometr... This study introduces measures to identify resonant (concentration of energy in a single or a few frequencies) or unfavorable earthquake ground motions. Probabilistic measures based on the entropy rate and the geometric properties of the power spectral density function (PSDF) of the ground acceleration are developed first. Subsequently, deterministic measures for the frequency content of the ground acceleration are also developed. These measures are then used for identifying resonance and criticality in stochastic earthquake models and 110 acceleration records measured at rock, stiff, medium and soft soil sites. The unfavorable earthquake record for a given structure is defined as the record having a narrow frequency content and dominant frequency close to the structure fundamental natural frequency. Accordingly, the measures developed in this study may provide a basis for selecting records that are capable of producing the highest structural response. Numerical verifications are provided on damage caused to structures by identified resonant records. 展开更多
关键词 Entropy rate Dispersion index Power spectral density function (PSDF) Frequency content Unfavorable groundmotion Resonant acceleration Critical accelerogram Energy Damage index
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