Assessment of the seismic non-linear behavior of ductile wall structures due to synthetic earthquakes     

Philippe Schwab  Pierino Lestuzzi 《Bulletin of Earthquake Engineering》2007,5(1):67-84

In this paper, different methods for generating synthetic earthquakes are compared in terms of related non-linear seismic response of ductile structures. The objective of the investigation is to formulate recommendations for the use of synthetic earthquakes for reliable seismic analysis. The comparison is focused on the accuracy of the reproduction of the characteristics of the structural non-linear response due to recorded earthquakes. First the investigations are carried out for non-linear single-degree-of-freedom systems. Later, the results are validated for a set of realistic buildings modelled as multi-degree-of-freedom systems. Various options of the classical stationary simulation procedure of SIMQKE and a non-stationary simulation procedure proposed by Sabetta and Pugliese are examined and compared. The adopted methodology uses a set of recorded earthquakes as a reference. Hundred synthetic accelerograms are generated for each examined simulation option with the condition that the related elastic responses are similar to those of the reference set. The non-linear single-degree-of-freedom systems are defined using six recognized hysteretic models and four levels of increasing non-linearity. The non-linear responses computed for the reference set and the studied simulation options are then statistically compared in terms of displacement ductility and energy. The results show that the implementation of the classical stationary procedure always leads to a significant underestimation of the ductility demand and a significant overestimation of the energy demand. By contrast, non-stationary time histories produce much better results. The results with the multi-degree-of-freedom systems are shown to confirm these conclusions.  相似文献   

Field reconnaissance of the 2007 Niigata-Chuetsu Oki earthquake     

Georgios Apostolakis  Nurhan Ecemis  Seda Dogruel 《地震工程与工程振动(英文版)》2007,6(4):317-330

As part of the 2007 Tri-Center Field Mission to Japan, a reconnaissance team comprised of fourteen graduate students and three faculty members from three U.S. earthquake engineering research centers, namely, Multidisciplinary Center for Earthquake Engineering Research (MCEER), Mid-America Earthquake Center (MAE), and Pacifi c Earthquake Engineering Research Center (PEER), undertook a reconnaissance visit to the affected area shortly after the 2007 Niigata- Chuetsu Oki earthquake. This mission provided an opportunity to review the nature of the earthquake damage that occurred, as well as to assess the signifi cance of the damage from an educational perspective. This paper reports on the seismological characteristics of the earthquake, preliminary fi ndings of geotechnical and structural damage, and the causes of the observed failures or collapses. In addition, economic and socio-economic considerations and experiences to enhance earthquake resilience are presented.  相似文献   

Finite-difference Euler Deconvolution Algorithm Applied to the Interpretation of Magnetic Data from Northern Bulgaria     

Daniela?GerovskaEmail author  Petar?Stavrev  Marcos J.?Araúzo-Bravo 《Pure and Applied Geophysics》2005,162(3):591-608

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Experimental remolding on the caprock’s 3D strain field of the Indosinian-Yanshanian epoch in Tongling deposit concentrating area     

DENG Jun  HUANG Dinghua  WANG Qingfei  WAN Li  SUN Zhongshi  YANG Liqiang & GAO Bangfei . State Key Laboratory of Geological Processes  Mineral Resources  China University of Geosciences  Beijing  China  . Faculty of Earth Sciences  China University of Geosciences  Wuhan  China  . Department of Earth Sciences  Jilin University  Changchun  China 《中国科学D辑(英文版)》2005,(7)

~~Experimental remolding on the caprock’s 3D strain field of the Indosinian-Yanshanian epoch in Tongling deposit concentrating area1.Chang,Y.F.,Liu,X.P.,Wu,Y.C,The Cu,Fe Metallogenic Belt in the Middle-Lower Reaches of Yangtze River(in Chinese with English abstract),Beijing:Geological Publishing House,1991,1-379. 2.Yin,H.F.,Wu,S.B.,Du,Y.S.,South China is the part of multi-islands and multi-oceans system of Tethys,Earth Sciences(in Chinese),1999,24(1):1-12. 3.Wu,G G,Zha…  相似文献   

浙江省蒙山地区平水组成岩环境及其构造变形分析     

汪庆华  陈忠大 《浙江国土资源》2001,17(1):27-33

蒙山地区平水组细碧岩角班岩系经岩石化学、微量元素及稀土元素特征和构造变形特征研究表明,形成于岛弧环境,岩浆物质来源为幔源型,来源深度约为19Km±,是扬子古板块活动陆缘增生阶段的产物;依据其构造变形特征,探讨多期变形构造叠加型式和变质作用,并确定其构造变化序列,同时显示出与双溪坞群不同的成岩构造背景.  相似文献   

含金毒砂中晶格金的确定及其形成机理研究   总被引：7，自引：0，他引：7  

胡文宣  张文兰  胡受奚  华仁民  朱建民 《地质学报》2001,75(3):410-418

利用电子探针(EPMA)和高分辨透射电子图像(HRTEM)分析技术,对湖南黄金洞金矿含金毒砂进行了背散射电子图像、X-射线面扫描、定量微区分析、线分析以及高分辨晶体结构观测等综合研究。结果表明,含金毒砂中没有发现纳米级乃至更小粒级的超显微包体金,毒砂晶格完整,无任何“异构体”,Au散布于整个毒砂颗粒中,以晶格金形式存在。此外,金含量在不同的生长环带中有显著变化,表明Au是在毒砂形成过程中进入其晶格的。金的加入导致毒砂晶体结构中(100)面网间距局部变宽,晶胞参数也发生了微弱变化,a轴变长。详细分析认为,Au主要是以Au~(3+)替代Fe~(3+)进入AsS~(3-)八面体空位中的,Eh值变化可能是控制毒砂中晶格金形成的主要因素。  相似文献   

The Thermodynamic and Dynamical Features of Double Front Structures During 21-31 July 1998 in China   总被引：3，自引：0，他引：3  

ZHOU Yushu  DENG Guo  LEI Ting  JU Jianhua 《大气科学进展》2005,22(6):924-935

1. IntroductionDuring June and July, from the mid-lower reachesof the Yangtze River basin in China to southern Japan,a precipitation zone with intensive torrential rain ap-pears and lasts for two to three weeks. This phe-nomenon is called the "mei-yu" in …  相似文献   

新疆西天山那拉提构造带变质核部杂岩地质构造特征     

高鹏  王宏运  倪新元  李兵  胡志军  王耀武 《陕西地质》2005,23(2):61-69

新疆西天山那拉提构造带变质核部杂岩分布于新疆巩留县那拉提山山脊北侧，整体沿那位提南缘构造带北侧呈近东西向展布，为一套由高级变质表壳岩、灰色片麻岩组成的早前寒武系高级片麻岩系，历经多期不同构造体制变形变质改造与再造，形成多相片麻岩系，并呈长垣状变质核部杂岩隆升，构成那拉提造山带的核部构造物质组成。  相似文献   

构造叠加晕法是危机金矿山寻找接替资源的有效新方法   总被引：5，自引：2，他引：5  

李惠  张国义  禹斌  张连发  王支农  李德亮  王志远 《矿产与地质》2005,19(6):683-687

构造叠加晕是在发展了原生晕分带理论基础上而开创的一种盲矿预测新方法、新技术.运用该方法在金矿区深部及其外围进行盲矿预测,取得了显著效果.  相似文献   

柴达木盆地新生代构造样式的演化特点   总被引：23，自引：4，他引：19  

戴俊生  曹代勇 《地质论评》2000,46(5):455-460

本文将柴达木盆地新生代构造样式的演化归纳为６种序列和两个主要阶段,即冲断构造→生背斜→反冲断层→断层背斜序列、生长背斜→反冲断层＋断层疹斜序列、生长背斜→纵弯背斜序列、生长断层→滑脱褶皱序列、水平岩层→纵弯背斜序列。构造样式的演化具有明显的地区性特点,盆地南北两侧具似性,而盆地中央呈东西差异。两个阶段是喜马拉雅早中期的压缩构造样式发育阶段和晚期的强烈压缩构造样式发育阶段。控制柴达木盆地构造样式规律  相似文献