排序方式: 共有67条查询结果,搜索用时 187 毫秒
51.
Jiang Jinren Lu Qinnian and Sun JingjiangInstitute of Engineering Mechanics SSB Harbin ChinaHarbin University of Architecture Engineering Harbin China 《中国地震研究》1995,(4)
The statistical characteristics of strong ground motion specified by response spectrum and power spectral density function are studied using 190 strong-motion records of the Haicheng and Tangshan earthquakes in China and 138 earthquakes in the western United States.The response spectrum is normalized by the peak ground acceleration(i.e.,represented as spectral magnification factor),and the power spectral density function is described by the Kanai-Tajimi spectrum.The statistics and dependence of parameters are evaluated,and correlations between the spectral magnification factor or Kanai-Tajimi spectral parameters and the site condition,epicentral distance,or local magnitude are investigated.The statistical characteristics of spectra China and the U.S.A.are compared.Based on the results obtained the values of the statistics on spectral parameters for earthquake engineering applications in China are suggested. 相似文献
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Dynamic performance of cable-stayed bridge tower with multi-stage pendulum mass damper under wind excitations—Ⅱ: Experiment 总被引:1,自引:0,他引:1
The possibility of using a multi-stage pendulum mass damper (MSPMD) to control wind-induced vibration of a single column tower of a cable-stayed bridge during construction was studied theoretically in part I of this work. In this paper, the performance of the MSPMD for reducing bridge tower vibration is studied experimentally. A MSPMD model and a tower model of the bridge with geometry scaling of 1:100 were designed and manufactured. Calibration of the MSPMD model with different wire lengths is conducted to verify the analytical model of the damper. A series of tests for the uncontrolled freestanding tower, tower with cables, and tower with MSPMD model are then performed under harmonic and white noise excitations. The experimental results show that the responses of the tower model signif icantly decrease with the installation of the MSPMD model, which demonstrates the effectiveness of the MSPMD to mitigate the vibration of the bridge tower. 相似文献
53.
目前研究地震动空间变化的主要方法是利用密集台阵(如SMART1台阵等)的强震观测记录进行统计分析,由于地震动观测资料的不足,因而缺少基岩及不同场地类别地震动相干函数模型. 本文利用数值方法了模拟理论地震图,进而研究采用震源位错模型的基岩随机地震动的空间变化规律,并考虑震源破裂速度、子源个数、震源深度和介质传播速度等因素的影响. 其具体思路为:首先对应于每个样本,用有限差分数值模拟方法计算弹性半空间近场地震动场,而后对所有样本的计算结果进行统计,给出了一个走滑断层情形下的近场基岩表面及沿基岩竖直方向水平分量地震动的相干函数模型. 相似文献
54.
Lei Zhao Chengchen Cui Xiaojun Li Institute of Engineering Mechanics China Earthquake Administration Harbin China 《地震学报(英文版)》2010,(1):111-116
A 3-D soil-pipe nonlinear finite element model with contact element is suggested and the influences of the rupture mode, thickness and rigidity of overlying soil on the response of buried pipeline are analyzed. The numerical results show that the soil rupture mode determines the location of the large deformation or failure of the pipeline, and the plastic deformation of the pipeline occurs at the zone where the plastic deformation or rupture of the overlying soil appears. When the fault dip angle on bedrock... 相似文献
55.
HU Zhongjun NIE Lei PAN Jinglong XU Tian . College of Construction Engineering Jilin University Changchun China. School of Civil Engineering Harbin Institute of Technology Harbin China 《东北亚地学研究》2009,(4):226-229
By axial compression tests on 6 reinforced concrete slender columns wrapped with carbon fiberreinforced plastic ( CFRP), with slenderness ratio(SR) from 4. 5 to 17.5, the results show that when SR increases the retrofitting effect declines. In the case of same SR, the stability coefficient ( SC ) for the reinforced concrete(RC) columns with CFRP is much less than that without CFRP. There is 20% increase of stable bearing capacity to the former as compared with the latter when the SR in less than 17.5. The study summarized the simplified formula for SC, which provides a reference for engineering designers. 相似文献
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通过对黑龙江省嘉荫县乌拉嘎盆地内各地层单元的岩石组合、生物化石组合与时代和沉积环境的系统研究与厘定,并与孙吴-嘉荫盆地其他断陷以及松辽盆地进行对比.研究表明:乌拉嘎盆地中、新生代划分为3个构造层5个岩石地层单元,并对其空间展布与演化进行了恢复,填制区域地质图.乌拉嘎盆地表现为明显的3期不同性质的盆地叠合演化特点,其间由... 相似文献
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The New Seismic Zoning Map of China was prepared from 1987 to 1990 and officially promulgated in 1991.In comparison with the previous two seismic zoning maps prepared in 1957 and 1977,some new methods were applied to upgrade the method currently used for seismic hazard analysis.First,a probabilistic method was used instead of the deterministic analysis was used for previous mapping.Second,by taking advantages of the long history of historical seismic data in China,the nonhomogeneity of seismicity both in space and in time has been fully considered and hence the over-and/or underestimation of seismic hazard could be avoided.Third,the results of middle-and long-term earthquake prediction based on tectonic evidence have been incorporated into seismic hazard analysis.In addition,the attenuation laws for both intensity and peak acceleration of strong motion as the mapping parameters are also presented.Finally,an evaluation of the New Seismic Map and its effect on engineering application,such as aseismic desi 相似文献
59.
Wang Chengmin Zhou Shengkui Zhao Yi Wang Wei Chen Ronghua Xu Daoyi Ma Li Huang Wei and Geng JunjunCenter for Analysis Prediction CSB Beijing China SeismoIogical Bureau of Heilongjiang Province Harbin China Seismological Bureau of Shanghai Municipality Shanghai China Institute of Geology CSB Beijing China 《中国地震研究》1999,(3)
The level of present understanding of earthquake prediction of seismologists at home and abroad is very different. This is because China has opened up a special path of earthquake prediction research that has not been explored by other countries, with its own advantages and potentialities.Therefore, we considered that it is the most practical way to use the advantages and potentialities for raising the earthquake prediction level. For this purpose, we have developed a set of intelligent decision support system for earthquake prediction, with the analysis of cluster anomalies process at the core. The facts show that it can obviously raise the level of synthetic earthquake prediction. 相似文献
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Relation between sea surface temperature anomaly in the Atlantic and summer precipitation over the Northeast China 总被引:1,自引:0,他引:1
1 IwrRoDUcrIowln recen l00 years. mateorolQgi8ts have paid mu0h aneation to impact of ocean onlong-range weather process. Because fram view POillt of space and tAne scale condition,ocean is one of very important phySical factor for the evolotion of thespheric circulation.The scientific research cooperation grOup (l979) first found that SST in the equatorialeastern Pacific reversely correlates with summer tempendre aver Nowheast China. Pan etal (1981) discussed re1atfon between heating of… 相似文献