Damaging properties of ground motions and prediction of maximum response of structures based on momentary energy response     

Norio Hori  Norio Inoue 《地震工程与结构动力学》2002,31(9):1657-1679

Dynamic damaging potential of ground motions must be evaluated by the response behaviour of structures, and it is necessary to indicate what properties of ground motions are most appropriate for evaluation. For that purpose, the behaviour of energy input process and hysteretic energy dissipation are investigated in this study. It is found that the momentary input energy that is an index for the intensity of input energy is related to the characteristics of earthquakes such as cyclic or impulsive, and to the response displacement of structures immediately. On the basis of these results, a procedure is proposed to predict inelastic response displacement of structures by corresponding earthquake input energy to structural dissipated damping and hysteretic energy. In this procedure the earthquake response of structures is recognized as an input and dissipation process of energy, and therefore structural properties and damaging properties of ground motions can be taken into account more generally. Lastly, the studies of the pseudodynamic loading test of reinforced concrete structure specimens subjected to ground motions with different time duration are shown. The purpose of this test is to estimate the damaging properties of ground motions and the accuracy of the proposed prediction procedure. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

末次盛冰期百年尺度气候变化的南京石笋记录   总被引：17，自引：10，他引：17       下载免费PDF全文

汪永进  孔兴功  邵晓华  吴江滢 《第四纪研究》2002,22(3):243-251

据年层计数和TIMSU系测年结果,建立了南京汤山葫芦洞YT石笋年际精度时间标尺(18000～14000aB.P.)。除石笋顶部5mm层段外,高分辨率的^δ18O、灰度和年层厚度3种指标在百年尺度上具有相当一致的对应关系,表明这3种指标对气候因素变化响应比较敏感。综合石笋^δ18O和本区古植被资料,估计末次盛冰期和波令暖期年均温分别达7℃和15℃。石笋揭示的末次盛冰期气候可进一步划分为4个阶段:1)18150～16900aB.P.,年均温和洞穴湿度逐步下降;2)16900～16100aB.P.,年均温和洞穴湿度相对稳定,可进一步划分为3个暖峰和两个冷谷;3)16100～15600aB.P.,年均温快速下降,按氧同位素平衡方程计算,其冷谷可能接近于0℃,但洞穴湿度比前期下降幅度并不大;4)15600～14750aB.P.,年均温和洞穴湿度比较稳定。这种气候演化的阶段性和突变性与北大西洋地区气候记录可以对比,反映极地与东亚季风气候受共同的驱动机制支配。从石笋4种指标(^δ18O、^δ13C、灰度和年层厚度)的功率谱图中识别出不同尺度的太阳活动周期成分,其中80aGleissberg周期特别显著,表明末次盛冰期边界条件下太阳活动仍是短尺度气候变化的主要驱动力。  相似文献   

Ordovician Graptolite Rhabdosome Complication and Its Implications on Sea Level Changes     

Wang Chuanshang  Wang Xiaofeng  Chen Xiaohong 《中国地质大学学报(英文版)》2002,13(3)

A total of four times of rhabdosome complication events, i.e., the lateral branching of graptolite stipes during the Late Middle Ordovician, the secondary branching of graptolite stipes at the earliest Upper Ordovician, the early Qiantangjiangian of Upper Ordovician and the middle Qiantangjiangian, respectively, is discussed in this paper. These events and other adaptation events demonstrate close relationships between a diverse graptolite fauna and sea level changes, and consequently can be employed to study sea level fluctuations. It is safe to conclude that the complication of rhabdosome started at the maximum flooding surface (MFS) and terminated at the beginning of regression.  相似文献   

Seismic moment distribution revisited: II. Moment conservation principle   总被引：3，自引：0，他引：3  

Yan Y. Kagan 《Geophysical Journal International》2002,149(3):731-754

  相似文献   

Maximum earthquake magnitudes in the Aegean area constrained by tectonic moment release rates   总被引：6，自引：0，他引：6  

G. Ch. Koravos  I. G. Main  T. M. Tsapanos  R. M. W. Musson 《Geophysical Journal International》2003,152(1):94-112

  相似文献   

最大熵原理与地震频度-震级关系   总被引：1，自引：0，他引：1       下载免费PDF全文

冯利华 《地震地质》2003,25(2):260-265

地震是一种随机事件 ,它的发生具有极大的不确定性 ,因而可以用熵来进行描述。地震以最无序的方式在各地发生 ,意味着地震熵达到了极大值。古登堡 (Gutenberg)和里克特 (Richter)根据资料和经验得出的地震频度 -震级关系式实际上是在给定的约束条件下 ,当地震熵取极大值时得到的一种负指数分布。文中从最大熵原理得出了同一形式的地震频度 -震级关系 ,使它的来源从理论上得到了解释  相似文献   

中-吉-乌铁路(中国段)设计洪水的研究     

马淑红  杨涛  郭擎宇  杨旭  戈峰  徐东进 《沙漠与绿洲气象(新疆气象)》2003,26(2):5-7,18

根据中—吉—乌铁路(中国段)沿线近10个水文观测站40多年(建站一2000年)最大洪峰流量资料，对中—吉—乌铁路(中国段)最大洪峰流量设计值进行系统的研究。应用统计学导出的P—Ⅲ分布，预测了中—吉—乌铁路(中国段)最大洪峰流量不同概率设计值。这对于中—吉—乌铁路(中国段)工程设计和施工及未来铁路养护等具有重要的科学意义和工程价值。  相似文献   

A variance-ratio test for supporting a variable mean in kriging     

Peter K. Kitanidis 《Mathematical Geology》1997,29(3):335-348

This article discusses the issue of whether to use a variable mean and describes a test that can be used to evaluate whether it is justified to add terms to the drift (deterministic part) of a geostatistical model. The basic model could be the intrinsic one, where the deterministic part is a constant, and the alternate model could be any model that includes a constant term in the expression for the drift. Also, differences between constant- and variable-mean models are discussed.  相似文献   

地球物理反问题中的随机反演理论     

周竹生  陆江南 《物探化探计算技术》1997,19(4):289-297

本文从最大后验概率密度观点出发，在数据噪音向量和待求模型向量为具有零均值的独立高斯随机过程的假设前提下，建立起了随机反演的非线性系统方程；给出了模型方差估计的函数表达式，并在文章最后，证明了反演解的稀疏性，即解释了随机反演的输出解的高分辨率特征。文章在最小二乘反演方法的基础上，发展并完善了随机反演方法的理论基础；揭示了随机反演方法与最小二乘反演方法之间的本质区别；阐述了随机反演方法的优越性，并指出了其广阔的应用前景。  相似文献   

Study of the liquefaction resistance of a saturated sand reinforced with Geosynthetics   总被引：1，自引：0，他引：1  

D. Vercueil  P. Billet  D. Cordary 《Soil Dynamics and Earthquake Engineering》1997,16(7-8):417-425

This article presents various tests using a cyclic triaxial instrument, on samples of saturated Hostun RF sand, reinforced with circular sheets of geosynthetic material. Tests performed with different types of geosynthetics of different compressibility, rigidity and roughness characteristics indicate a significant increase in liquefaction resistance for samples reinforced with compressible, non-woven geotextiles. The undrained behaviour of saturated Hostun RF sand reinforced with non-woven geotextiles is analysed on the basis of different test series. This analysis highlights the influence of reinforcement compressibility on interstitial pressure distribution in the sample, thus showing the role of this type of inclusion in the increase in liquefaction resistance.  相似文献