Nonlinear earthquake response analysis and energy calculation for seismic slit shear wall structures     

蒋欢军  吕西林 《地震工程与工程振动(英文版)》2002,1(2):227-237

Based on the concept of structural passive control, a new type of slit shear wall, with improved seismic performance when compared to an ordinary solid shear wall, was proposed by the authors in 1996. The idea has been verified by a series of pseudo-static and dynamic tests. In this paper a macro numerical model is developed for the wall element and the energy dissipation device. Then, nonlinear time history analysis is carried out for a 10-story slit shear wall model tested on a shaking table. Furthermore, the seismic input energy and the individual energy dissipated by the components are calculated by a method based on Newmark-β assumptions for this shear wall model, and the advantages of this shear wall are further demonstrated by the calculation results from the viewpoint of energy. Finally, according to the seismic damage criterion on the basis of plastic accumulative energy and maximum response, the optimal analysis is carried out to select design parameters for the energy dissipation device.  相似文献   

基于高温高压岩石破裂实验结果对中强地震前震中附近区域部分地震学现象的初步解释   总被引：6，自引：1，他引：6       下载免费PDF全文

蒋海昆  张流  周永胜  侯海峰  晁文海 《地震工程学报》2002,24(2):113-122

依据高温高压岩石破裂实验结果并结合理论分析，对 附近区域不同深度温压条件下岩石变形破坏性质及破坏失稳的力学行为进行了研究，在一次应力加载循环中，发生破坏的部位随时间具有向深部下迁的趋势。考虑到深度温压条件下岩石的渐进式破坏行为及突发失稳，对主震前震中附近区域小地震活动的增强、平静、活化等现象，以及b值等时间序列参数变化的可能机理进行初步探讨，并简单讨论了两类平静和两类b值变化的可能原因。  相似文献   

Recent developments in seismically isolated buildings in Japan     

Shin Okamoto  Nagahide Kani  Masahiko Higashino  Norihide Koshika  Masayuki Kimizuka  Mitsumasa Midorikawa  Masanori Iiba 《地震工程与工程振动(英文版)》2002,1(2):213-225

The Building Standard Law of Japan and related Enforcement Order and Notifications have been substantially revised since the year 2000 to introduce a performance-based regulatory and deregulation system for building control systems. Up to then, time-history analyses were mandatory for isolated buildings and had to be specially approved by the Minster of the Ministry of Construction (MOC). Simplified design procedures based on the equivalent linear method for seismically isolated buildings have been issued as “Notification 2009 — Structural calculation procedure for buildings with seismic isolation” from MOC, and are now integrated into the Ministry of Land, Infrastructure, and Transportation (MLIT). Along with Notification 2009, “Notification 1446 of year 2000 — Standard for specifications and test methods for seismic isolation devices” was also issued. Buildings with heights equal to or less than 60m and that are designed according to these Notifications, including base isolated buildings, only need approval from local building officials, and no longer require the special approval of the Minister of MLIT. This paper summarizes: 1) some statistics related to buildings with seismic isolation completed up to the end of 2001; 2) simplified design procedures required by Notification 2009 of year 2000; and 3) performance of seismic isolation devices required by Notification 1446 of year 2000.  相似文献   

Estimates of lichen growth–rate in northern Sweden     

Wibjörn Karlén  & Jessica L. Black 《Geografiska Annaler: Series A, Physical Geography》2002,84(3&4):225-232

Two lichenometric techniques were compared in a study of lichen growth–rate in northern Sweden. The first technique, based on the maximum lichen diameter on glacier moraines, was identical to the technique used in the 1970s, whereas the other utilized the lichen diameter measured on 100 randomly selected boulders. The results indicate that it does not matter which technique is chosen, as long as the technique is used consistently on both the calibration surfaces and the surfaces to be dated. The use of data from both the 1970s and the 2000s increased the number of calibration surfaces available. The new calibration curve indicates that the age of Little Ice Age moraines was underestimated by up to about 30 years in the study conducted in the 1970s.  相似文献   

Relationship between crustal finite strain and seismic anisotropy in the mantle, Pacific–Australia plate boundary zone, South Island, New Zealand     

Timothy A. Little  Martha K. Savage  Basil Tikoff 《Geophysical Journal International》2002,151(1):106-116

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Monte-Carlo inversion for a global shear-velocity model of the crust and upper mantle   总被引：15，自引：1，他引：15  

N. M. Shapiro  M. H. Ritzwoller 《Geophysical Journal International》2002,151(1):88-105

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Tectonique transpressive en terre Adélie au Paléoprotérozoı̈que (Est Antarctique)Palaeoproterozoic transpression in Terre Adélie (East Antarctica)     

Anne Pelletier  Denis Gapais  René-Pierre Ménot  Jean-Jacques Peucat 《Comptes Rendus Geoscience》2002,334(7):505-511

The Palaeoproterozoic units of Terre Adélie show two types of structural domains associated with HT–LP metamorphic conditions: domes and NS–N340° striking vertical shear zones. Shear zones reflect dextral transpressive motions. Domes reflect sub-vertical shortening and principal stretching subparallel to shear zones. They could partly result from longitudinal flow coeval with transpression. Deformations are comparable to those described along the eastern and western boundaries of the Archean Gawler Craton (South-East Australia), which underlines the continuity between these two areas before opening of the Austral Ocean. To cite this article: A. Pelletier et al., C. R. Geoscience 334 (2002) 505–511.  相似文献   

试论少数民族地区的生态化旅游开发   总被引：6，自引：7，他引：6  

简王华 《干旱区地理》2003,26(3):286-290

生态化旅游开发是有别于传统的旅游开发的一种可持续开发与发展的理念，它追求的是生态、社会和经济综合效益的最大化，应该成为旅游开发与旅游业发展的主要方向。民族地区的旅游开发具有特定的区域生态特征。其生态化旅游开发的核心问题是旅游环境容量的确定与旅游环境的保护、民族特色与民族文化的弘扬以及注重旅游经济发展过程中旅游业的拉动效应及其依托性之间的关系处理等。  相似文献   

陕西凤县八卦庙金矿床成矿地质特征及外围找矿前景分析   总被引：3，自引：0，他引：3  

张万业  刘方杰  黄长青 《矿产与地质》2003,17(2):136-139

阐述了八卦庙金矿床经历了长期、复杂的非线性成矿过程，着重分析了：含矿建造为与同生伸展断裂伴生的海底喷流热水沉积岩、热水浊积碎屑岩；脆-韧性剪切构造控制着主成矿过程；后期幔源岩浆气液叠加富集使其成为超大型金矿床。指出矿床成因为热水同生沉积细碎屑岩-剪切蚀变岩-幔源岩浆气液叠加富集型。八卦庙金矿床外围仍有巨大的找矿前景。  相似文献   

萃淋树脂吸附法测金   总被引：5，自引：0，他引：5  

王瑛辉  陈佩锋 《矿产与地质》2003,17(2):179-182

对萃淋树脂在酸性介质中吸附解脱金及相关体系的条件选择，以及萃淋树脂在生产方面的应用前景进行了实验研究。结果表明，萃淋树脂在稀王水介质中能较好地吸附金，用硫脲解脱金简便完全，检测限达0．002μg／g，吸附率达100％，解脱率99．8％。  相似文献