大弯矩混凝土电杆的设计计算与选择     

李丹 《中国勘察设计》2011,(3):76-78

随着地区经济的发展和人民生活水平的提高,电网用电负荷大幅增加。根据本地区当前用电量及配网发展规划的需要,新建架空主干线路一般都选用大截面导线,多采用双回路架设,这就对混凝土电杆的强度提出了更高的要求。本文通过典型计算详细介绍了直线电杆的水平受力情况及大弯矩混凝土电杆的设计选择,并对其进行归纳,可供相关设计人员的参考。  相似文献   

鄂东南铁山梯形石香肠构造基质层中的应变测量与分析     

吴林波  曾佐勋  高曦  王杰 《现代地质》2012,26(2):294-307

鄂东南铁山是全球第二个梯形石香肠构造的发现点。以该区成层分布、形态相近的梯形石香肠构造为研究对象,利用惯量椭圆法对其基质层进行有限应变测量,获得真应变差、岩层厚度比、运动学涡度分布等。结合梯形石香肠几何形态学、岩石学特征,对所得数据综合分析研究表明:剪切带中垂直剪切方向的厚度比值与其所受真应变差趋于负相关;该梯形石香肠构造是由其上、下相邻基质层厚度差异,基质层中总体上的纯剪切,局部相对集中的简单剪切及相对富集于张裂隙处角岩层中的热液流体等综合作用形成的;发育成层分布且形态相近的梯形石香肠构造所需特征性条件是能干层上、下相邻基质层厚度相差较大,且受总体上持续的平行层面拉伸、垂直层面压缩的纯剪切与局部的简单剪切共同作用。该类石香肠构造是较好的岩石流变学标志。  相似文献   

Research on the deformations in Qinghai-Tibet plateau and its margins by inverting seismic moment tensors and GPS velocities     

Xu Caijun  Liu Jingnan  Li Zhicai  Dong Lixiang 《地球空间信息科学学报》2013,16(4):54-60

We have determined approximate average rates of deformation in the Qinghai-Tibet plateau and its margins from the GPS data for last 10 years and the moment tensors from earthquakes between 1900 and 1999. We also determined the strain rate (seismic strain rate) associated with the seismic deformation using 254Mω≥5.0 earthquakes, and estimated the shortening and extension rates for every block in the area as well. We also estimated the strain rate (geodetic strain rate) by 80 GPS sites’ velocity vectors and analyzed characteristic of kinematics by two kinds of strain rates and discussed earthquake potential in the area. As a result, the deformation rates from seismic moment tensors and from GPS velocities are basically agreed with each other. It is feasible to analyze seismic risk by comparing geodetic strain rate with seismic strain rate based on the opinion that strain energy will be released through earthquake. It is concluded that there is no strong earthquake potential (>M7) in the Qinghai-Tibet plateau and its margins, but there is earthquake potential (>M5) in middle Tibet in a few years.  相似文献   

由地震释放的地震矩叠加推导平均应力场   总被引：2，自引：0，他引：2       下载免费PDF全文

盛书中  万永革  徐志国  卜玉菲  武晔  李迎秋 《地震地质》2013,35(1):92-100

文中给出了根据地震释放的总地震矩求解平均应力场的方法,并使用加入随机误差的人工合成震源机制解数据和唐山余震区震源机制解数据对其进行检验。由检验结果可知,该方法可以应用于区域平均应力场的求解。使用的震源机制解资料越多,所得结果越稳定,且更接近真实的区域应力场。该方法的优点是: 用每个地震的震级作为权重,能够较好地反映出大小地震在应力场反演中的不同贡献; 并且在计算过程中不需要知道震源机制解2个节面中哪个节面为地震断层面。  相似文献   

A theoretical study of correlation and earthquake magnitude based models between scaled energy on two source displacement     

Jeen-Hwa Wang 《地震学报(英文版)》2013,(6):373-376

The correlation of the scaled energy,e = Es/ Mo, versus earthquake magnitude, Ms, is studied based on two models： （1） Model 1 based on the use of the time function of the average displacements, with a ω^-2 source spectrum, across a fault plane; and （2） Model 2 based on the use of the time function of the average displacements, with a ω^-3 source spectrum, across a fault plane. For the second model, there are two cases： （a） As ζ= T, where r is the rise time and T the rupture time, lg（e） - -Ms; and （b） As ζ 〈〈 T, lg（e）- -（1/2）Ms. The second model leads to a negative value of e. This means that Model 2 cannot work for studying the present problem. The results obtained from Model 1 suggest that the source model is a factor, yet not a unique one, in controlling the correlation of e versus Ms.  相似文献   

Focal mechanisms in anisotropic media   总被引：8，自引：0，他引：8  

Václav Vavry&#;uk 《Geophysical Journal International》2005,161(2):334-346

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Deep lower crustal earthquakes in central India: inferences from analysis of regional broadband data of the 1997 May 21, Jabalpur earthquake   总被引：4，自引：0，他引：4  

N. Purnachandra Rao  T. Tsukuda  M. Kosuga  S. C. Bhatia  G. Suresh 《Geophysical Journal International》2002,148(1):132-138

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Towards automation of palynology 3: pollen pattern recognition using Gabor transforms and digital moments     

Y. Zhang  D. W. Fountain  R. M. Hodgson  J. R. Flenley  S. Gunetileke 《第四纪科学杂志》2004,19(8):763-768

The classification of pollen grains using texture information in combination with shape features is presented in this paper. The surface texture of pollen is characterised by using Gabor transforms, the geometric shape is described by using moment invariants, and the pollen grains are classified by an artificial neural network. In an experiment with five types of pollen grains, more than 97% of samples are correctly classified. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Determinable and non-determinable parameters of galvanic distortion in magnetotellurics   总被引：3，自引：0，他引：3  

H. M. Bibby  T. G. Caldwell  C. Brown 《Geophysical Journal International》2005,163(3):915-930

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Five dimensional LRS Bianchi type-I string cosmological model in Saez and Ballester theory     

G. Mohanty  R. R. Sahoo  K. L. Mahanta 《Astrophysics and Space Science》2007,312(3-4):321-324

In this paper, it is shown that five dimensional LRS Bianchi type-I string cosmological models do not survive for Geometric and Takabayasi string whereas Barotropic string i.e. ρ=ρ(λ) survives and degenerates string with ρ+λ=0 in scalar tensor theory of gravitation proposed by Saez and Ballester (Phys. Lett. A 113:467, 1986). Further we studied some physical and geometrical properties of the model.  相似文献