排序方式: 共有67条查询结果,搜索用时 15 毫秒
51.
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
52.
Nie Wu Yu Xiukun Ma Chunyan Li Weiyang Associate Professor Harbin Shipbuilding Engineering Institute Harbin Research Staff Harbin Shipbuilding Engineering Institute Harbin Professor Harbin Shipbuilding Engineering Institute Harbin 《中国海洋工程》1993,(2)
A dynamic response analysis in the frequency domain is presented for risers subjected to combined wave and current loading. Considering the effects of current, a modified wave spectrum is adopted to compute the linearized drag force. An additional drag force convolution term is added to the linearized drag force spectrum, therefore the error is reduced which arises from the truncation of higher order terms in the drag force auto-correlation function. An expression of linearized drag force spectrum is given taking the relative velocity into account. It is found that the additional term is a fold convolution integral. In this paper dynamic responses of risers are investigated, while the influence of floater motion on risers is considered. The results demonstrate that the accuracy of the present method reaches the degree required in time domain analysis. 相似文献
53.
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
54.
Far-field analysis of effects of unilateral rupturing fault on the space correlation of strong ground motion 总被引:1,自引:0,他引:1
IntroductionThe data of strong motion arrays indicate that the variation of strong motion is intensive within several kilometers. The effect of this kind of variation to long-span or extended structure is very large and has attracted the attention of scientists of earthquake engineering for a long time (FENG, HU, 1981; Abrahamson, et al, 1987, 1991; Abrahamson, 1992; Yamazaki, Turke, 1992). It is well-known that temporal and spatial variation of ground strong motion is generally affected b… 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
56.
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
57.
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
58.
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
59.
分析了2005年7月25日林甸5.1级地震和2005年2月23日富裕3.7级地震前,林甸1井大地微电流、林甸04井的氦气和大庆地震台的地温异常变化。大地微电流在这2次地震前具有明显的异常变化,其异常幅度达正常背景值的10-20倍。氦气在林甸5.1级地震前具有明显前兆异常变化。 相似文献
60.
Introduction The study of attenuation relations for long-period ground motion is to meet the requirement of economy development. During the earthquakes such as the June 16, 1964 Niigata, Japan, M=7.5 earthquake, the March 24, 1977 Romania M=7.3 earthquake, the March 29, 1970 Gediz, Turkey, M=7.1 earthquake, the May 26, 1983 M=7.7 earthquake in the middle Japanese Sea, the September 19, 1985 Mexico M=8.1 earthquake, the September 16, 1994 M=7.3 earthquake in Tai- wan Strait, and the No… 相似文献