考虑地基土液化影响的桩基高层建筑体系地震反应分析   总被引：5，自引：2，他引：5  

陈国兴  谢君斐 《地震工程与工程振动》1995,15(4):93-103

本文建立了土体－结构体系地震反应分析的混合有限元法，并研究了地基土液化对地震反应的影响。本方法把土体－结构体系简化为一个完整的体系，该体系由梁（柱）单元、剪切杆单元、刚体单元、平面四边形等参单元与三角形单元、界面单元的任意组合来模拟。桩与上部结构材料视为线弹性体，土介质视为非线性材料。土的静应力－应变关系之间的非线性用邓肯一张模型来描述；土的动应力－应变关系之间的非线性和振动孔隙水压力对土的软化效  相似文献   

Application of Load/Unload Response Ratio in the Study of Seismicity in the Region of Iran     

Zhang Langping 《中国地震研究》2007,21(2):147-155

The variation of Load/Unload Response Ratio (LURR) against time for earthquakes in Kerman Province, Iran, on February 22, 2005, M6.4 and in Lorestan Province, Iran, on March 31, 2006, M6.1, has been calculated and analysed in this paper. The tempo-spatial scanning of LURR in the region of Iran during January 1, 2003 to March 31, 2006 has been conducted, with 1 year as a time-window, 1 month as a time-step, and the comparison of the LURR anomalous regions in 2004 with the actual earthquakes with M≥5.0 in the next year (2005) is also given, which shows that 11 earthquakes with M≥5.0 occurred in LURR anomalous regions while 12 earthquakes with M≥5.0 in LURR regions in 2005. Furthermore, the seismicity in this region is studied by investigating the evolvement of the anomalous LURR regions.  相似文献   

新疆积雪对气候变暖的响应   总被引：38，自引：1，他引：38  

李培基 《气象学报》2001,59(4):491-501

积雪对全球变暖的响应是当前正在争论的问题。文中通过地面气象台站和 SMMR微波卫星遥感两种积雪资料所建立的两个独立的积雪序列的一致性 ,证明前者在表现新疆积雪长期变化能力方面具有可靠性。阐明了积雪年际变化特征及其与冬季气温和降水量年际波动的关系 ,检验了积雪长期变化趋势。研究表明 ,虽然近 5 0 a来新疆冬季变暖十分显著 ,尤其 2 0世纪 90年代为最温暖的时期 ,但是积雪并未出现持续减少的现象 ;积雪长期变化表现为显著的年际波动过程叠加在长期缓慢的增加趋势之上。积雪年际波动是冬季降水量和气温两者年际波动共同作用的结果 ;冬季气温和降雪量变化受不同的欧亚环流振荡所控制 ;积雪增加趋势与降雪量趋势相一致 ,这可能是由于全球变暖导致海洋蒸发量增加 ,以及在寒冷干燥气候下积雪对降雪量变化更为敏感的缘故。  相似文献   

利用历史地震影响烈度的统计特性进行地震区划     

贾素娟  鄢家全 《地震研究》1996,19(3):277-285

  相似文献   

公主岭市西部水源地地下水系统初步研究     

王凤生 《吉林地质》1992,(3)

本文以公主岭市西部水源地为例,以地下水系统的观点,对该区进行了全面的系统化、模型化和最优化,建立了地下水系统的预报模型和管理模型,推求了各系统的资源量及水位、水质分布规律,最后得出了该区地下水最佳开采量和取水工程方案。  相似文献   

Site Response and Earthquake Design Spectra for Central Khartoum, Sudan     

Y. E-A. Mohamedzein  J. A. Abdalla  A. Abdelwahab 《Bulletin of Earthquake Engineering》2006,4(3):277-293

Khartoum, the capital of Sudan, is located at the confluence of White and Blue Niles. The city is heavily populated. Central Khartoum with its high-rise buildings is the center of governmental and business activities and is located on a strip adjacent to the Blue Nile. Geological and geotechnical data indicate that the subsoil conditions at Central Khartoum are characterized by alluvial deposits underlain by Nubian Sandstone at a depth of 25 m. The alluvial deposits, locally known as Gezira formations, consist of clays grading into silt and sand with depth. Macro seismic zonation of Sudan and its vicinities, developed by the authors, gave the ground acceleration at the bedrock surface. The effect of alluvial deposits in Central Khartoum on propagation of seismic motion parameters to the ground surface is investigated in this study. Correlations are proposed for pertinent cyclic soil properties such as shear modulus, damping, and shear wave velocity. The Equivalent-Linear Earthquake Response Analyses (EERA) Model was used to study the effect of local soil conditions on ground-motion parameters. In the absence of strong-motion records in Khartoum, available worldwide strong-motion records are used. Plots showing the time histories of ground motion parameters at the ground surface are obtained. The results indicate amplification of ground motion of up to 4.93. The predicted fundamental period of soils is about 0.5 s which is typical for these types of soils. The maximum spectral acceleration varied from 0.76 to 0.95 g. For design purposes, a response spectrum curve is proposed.  相似文献   

地震安全性评价工程师资格考试大纲已审定通过   总被引：12，自引：0，他引：12  

本刊讯 《震灾防御技术》2006,1(3):217-217

把美国西部地区作为参考区,采用我国地震动参数区划图工作时所使用的美国西部地区强震资料建立参考区水平向基岩短周期加速度反应谱衰减关系;采用美国南加州地区数字宽频带记录建立参考区水平向基岩长周期加速度反应谱衰减关系。与由丰富的等震线资料统计得出的我国东部地区和西部地区的地震烈度衰减关系一起,用转换方法分别得到了我国东部和西部地区水平向基岩加速度反应谱衰减关系。对该衰减关系在重大工程地震安全性评价工作中的应用提出了建议。  相似文献   

Evaluation of Electro-Oxidation of Textile Effluent Using Response Surface Methods     

R. Saravanathamizhan  N. Mohan  N. Balasubramanian  V. Ramamurthi  C. Ahmed Basha 《洁净——土壤、空气、水》2007,35(4):355-361

In the present investigation, treatment of textile effluent using an electrochemical technique was designed and analyzed using the Box-Behnken method. The influence of individual parameters on electro-oxidation of textile effluent has been critically examined using the response surface method (RSM), and a quadratic model for chemical oxygen demand (COD) reduction has been developed. It has been observed from the present analysis that the predicted values are in good agreement with experimental data with a correlation coefficient of 0.945.  相似文献   

同时满足多个阻尼反应谱的人造地震动时程合成   总被引：1，自引：0，他引：1  

张天中  马云生 《中国地震》1998,14(4):44-51

应用Ｍ．Ｈｉｒａｓａｗａ和Ｍ．Ｗａｔａｂｅ（１９９２）提出的方法,进行了相应的数学推导：即以满足某个阻尼比的反应谱的人造地震动作为初始时程,采用奇异值分解法,通过解线性方程组求出校正时程,并多次叠以逐步辐近  相似文献   

The evolution characteristics of positive and negative earthquakes before strong quakes in Kanto area and the Hyugo earthquake in Japan     

王裕仓  宋治平  细野耕司  陈学中  尹祥础 《地震学报(英文版)》1998,11(1):35-42

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