Application of clan member signal method in structural damage detection     

郭迅  卢书楠 《地震工程与工程振动(英文版)》2007,6(1):29-34

It is well known that in most cases, a reference is necessary for structural health diagnosis, and it is very difficult to obtain such a reference for a given structure. In this paper, a clan member signal method (CMSM) is proposed for use in structures consisting of groups (or clans) that have the same geometry, i.e., the same cross section and length, and identical boundary conditions. It is expected that signals measured on any undamaged member in a clan after an event could be used as a reference for any other members in the clan. To verify the applicability of the proposed method, a steel truss model is tested and the results show that the CMSM is very effective in detecting local damage in structures composed of identical slender members.  相似文献   

NUMERICAL MODELING OF HEAVY METAL POLLUTANT TRANSPORT-TRANSFORMATION IN FLUVIAL RIVERS：A REVIEW   总被引：1，自引：1，他引：1  

S. L. HUANG Z. H. WAN P. SMITH 《国际泥沙研究》2007,22(1):16-26

A detailed discussion of existing three kinds of mathematical models of heavy metal pollutant transport-transformation in fluvial rivers is presented, with an emphasis on the mathematical model of heavy metal pollutant transport-transformation dynamics. The imperfection of two kinds of mathematical models, that is, mathematical model of chemical thermodynamic equilibrium and that of chemical reaction kinetics, and the shortcoming of existing mathematical models of heavy metal pollutant transport-transformation dynamics are pointed out. Furthermore, the structure of mathematical model of heavy metal pollutant transport-transformation dynamics in fluvial rivers is suggested. Equations in the mathematical model of heavy metal pollutant transport-transformation dynamics in fluvial rivers will be discussed in the following paper.  相似文献   

Review of Research Progresses on the Science of Earthquake Underground Fluid in China During the Last 40 Years     

Liu Yaowei 《中国地震研究》2007,21(1):16-32

This paper presents a review of the development of scientific research and practice of earthquake underground fluid in China during the last 40 years, summaries early constructive research and primary achievements in this field. The science of earthquake underground fluid is closely correlated with earthquake monitoring and prediction, such as innovations in observation techniques and theoretical methods, and analysis of diversified parameters and research into predictive methods. The historical evolution of observation networks for underground fluid indicates that the demand for strong earthquake monitoring and prediction has become the driving force of the construction and development of the observation network. The development of observation techniques represents the trend based on multiform measurement, syntheses, and digitization. The study results of underground fluid theory and precursory mechanisms suggest that the precursory model, numerical simulation and in-door or field experimental research are the main technological approaches promoting innovation. Research results of earthquake forecast methods use physics based forecast techniques and the ideas of combination of usability and scientific advance. It has been proved by forecast practice that studying underground fluid is a very important subject in earthquake prediction on the Chinese mainland. Finally, the primary work and technical criterion on underground fluid are introduced, and some major scientific issues and development trends in different historical stages are summarized.  相似文献   

混凝土动力本构模型的基础理论与建模应用综述     

杜荣强  林皋  冷飞 《世界地震工程》2007,23(2):5-11

混凝土结构分析问题中动力荷载下混凝土的动力本构模型研究日益重要。为对建立混凝土动力本构关系的基础理论有系统的认知和了解其应用,对其进行了总结,简述了在建立混凝土动本构方面的应用,对混凝土动力本构模型的理论发展趋势作了展望。并对当前混凝土动力本构模型的应用做了概括评述,并指出了混凝土动力本构的可行研究方向,为建立混凝土动力本构模型提供指导。  相似文献   

地质定年方法综述与地球物理定年   总被引：8，自引：1，他引：8       下载免费PDF全文

郭桂红  韩锋 《地球物理学进展》2007,22(1):87-94

年代确定在地学中得到广泛应用.而作为地史学中重要的组成部分，年代确定为地质时期中地球岩石圈在时间上发展和演变提供了重要的时间约束.本文综述了四种定年方法：即古生物法；古地磁法；同位素法和地球物理法.随着地球物理的探测技术的发展，地球内部精细结构得到揭示.我们认为，应用地球物理资料确定年龄将可以弥补其它方法的缺陷，可能为地球内部三维岩石定年提供支撑.  相似文献   

基于模态曲率法的大跨度斜拉桥损伤识别   总被引：2，自引：0，他引：2  

李忠献  齐怀展  朱劲松 《地震工程与工程振动》2007,27(4):122-126

大跨度斜拉桥是重要的交通结构,研究其在主梁损伤条件下的损伤定位问题具有重要的工程价值。合理选择设计参数并对其进行敏感性分析,根据现场实测的桥梁动力特性数据,通过调整选定的设计参数对初始的有限元模型进行修正。在基准有限元模型的基础上,通过模拟不同位置和不同程度的主梁损伤,探讨了模态曲率法对结构损伤识别的有效性。结果表明,模态曲率法能够对大跨斜拉桥进行初步的损伤定位,确定主梁单处损伤和多处损伤的损伤位置;对于单处损伤,在噪声水平3%的情况下仍具有较好的适用性。从而为后期更为精确的桥梁结构损伤检测提供依据。  相似文献   

地震层析成像方法综述   总被引：2，自引：0，他引：2  

和锐  杨建思  张翼 《CT理论与应用研究》2007,16(1):35-48

本文从地震层析成像的模型参数化、正演、反演、解评估四个方面回顾了地震层析成像方法近期发展历程以及各时段地震层析成像方法的优、缺点.  相似文献   

电视气象节目中纪实手法的运用   总被引：7，自引：0，他引：7  

罗桂湘  韦坚 《广西气象》2004,25(2):59-62

通过对电视气象节目的特点进行分析，结合实际工作阐述了纪实手法的运用对增强节目可信度和可视性、提升艺术品位等方面的作用，并谈了纪实手法的具体运用方法，以期对电视气象节目质量的提高有所促进，达到良好的传播效果。  相似文献   

立式钢制储罐基于地震损伤性能的抗震设计方法     

孙建刚  周利剑  魏志真 《世界地震工程》2004,20(2):122-128

针对立式钢制储罐在强烈地震作用下会产生不同程度的损伤的特点，遵循抗震设计规范的“小震不坏，中震可修，大震不倒”的抗震设计原则，结合三水准烈度，提出了储罐的地震损伤性能目标，并给出了基于地震损伤性能的抗震设计方法。所提出抗震设计方法，更加准确地考虑了储罐的提离问题。  相似文献   

莫来石的研究进展   总被引：17，自引：0，他引：17  

陈冬  陈南春 《矿产与地质》2004,18(1):52-54

叙述莫来石的开发利用现状以及采取的相应深加工技术，重点介绍了莫来石的研究现状及应用。同时对莫来石的进一步研究进行了分析。  相似文献