饱和砂土地震液化危害及液化机理分析     

刘红军  杨东海 《森林工程》2005,21(4):29-31

饱和砂土在地震作用下,易产生液化,从而对工程建筑产生了许多危害。文中从四个方面列举出由于砂土液化对工程建筑及人民生命财产所造成的不利影响。并探讨了地震力作用下饱和砂土的液化机理。从而为治理砂土液化提供可靠的理论依据。  相似文献   

A New Earthquake Damage Model for RC Structure     

YU Hai-xiang~  WU Jian-hua~  ZHANG Guo-bin~ 《保鲜与加工》2004,(5):43-48

During the process of seismic design of structures, prediction of earthquake damage in future and estimation of economic loss after earthquake, it is important task to select appropriate variables to establish damage models for offering quantitatively the damage indices of structures under earthquake. In this article a few types of damage variables and some two-parameter damage models are first analyzed, then a new damage model on the basis of damage mechanics is proposed and at last the value of the parameter in the model is given.  相似文献   

Analysis of the Total Energy and Its Influencing Factors for Seismic Structures     

Xiao Mingkui  Liu Bo  Bai Shaoliang 《保鲜与加工》1996,(2):20-33

In this paper, the total input earthquake energy and influencing effects for shear type,shear-bending type, bending type aseismic structures of the single freedom system and multiple freedom elastic-plastic system are analyzed by synthesizing various effects and employing the timehistory analysis method. Based on the analysis results, the total input earthquake energy spectrum is presented.The simplified methods for analyzing the total input energy of multiple freedom elastic-plastic systems are proposed to provide some basis for developing aseismic structure design method and Double-Failure Criteria.  相似文献   

Earthquake Prediction by Using Support Vector Machines     

XIAO Han-guang  CAI Gong-zhong  YUAN Qian-fei  LIU Xing-hua 《保鲜与加工》2007,(1):114-119

  相似文献   

地震灾区农田土壤质量评价及空间分布特征——以彭州市新黄村为例     

张毅  蔡艳  杨杰  张世熔  李婷  袁大刚  黄爱萍 《核农学报》2010,24(5):1038-1043

本文将熵权系数法与地理信息系统（GIS）技术相结合,对512汶川地震典型灾区——彭州市新黄村农田土壤质量进行综合评价和分级,探讨了该区域土壤质量空间分布特征,并结合震后人类活动分析其土壤质量影响因素。结果表明,研究区域土壤质量分布以2级水平为主,1级次之,3级最少,分别占区域面积的819%、167%和14%。震后人类活动会影响土壤质量,其中以改变土壤微生物区系结构和引入重金属物质而引起的土壤质量变化为主。  相似文献   

汶川地震次生山地灾害危险性评价及震后减灾对策经济学分析   总被引：1，自引：0，他引：1  

刘连中  刘洪江  朱怀方 《水土保持研究》2010,17(1)

从地形地貌、地质、气候、水文、植被、灾害状况、人类活动等7个方面选取11个因子,采用定性与定量相结合的方法,引入危险性指数来评价汶川地震次生山地灾害的危险性大小,并利用GIS技术,按区域因素"相同或相似归类、相异分级"的原则,将研究区分为高度危险区、中度危险区、低度危险区和无危险区等四个等级,进行次生山地灾害危险性评价与区划,并运用最优灾害成本模型对减灾投入进行经济性评价,从而提出合理的防灾减灾对策与建议。  相似文献   

Analysis on Seismic Robustness of Urban Water SupplySystem Based on Disaster Resilience     

JIN Shumiao  WANG Shaoyu 《保鲜与加工》2012,(Z1):209-214

Based on the concept and characteristics of disaster resilience, technical robustness and organizational robustness were discussed by updating trunk lines of urban water supply system for two different earthquake magnitudes, M 6.5 and M 7.0 respectively, where lifeline earthquake loss model was taken as a starting point. Monte Carlo based GIRAFFE model was adopted in this research. Result shows that retrofit of trunk lines is helpful for both technical robustness and organizational robustness, and the updating effect would become more significant as the earthquake magnitude increases. Furthermore, criticalness of pipelines is not determined by the earthquake magnitude, but as time goes it depends on their respective locations in the system and system configuration. At the moment instantly after earthquake, the pipelines which are located at the center of system would be more critical; while 24 hours later, the pipelines which are closer to the reservoir will become more critical.  相似文献   

Simulation of nonstationary stochastic earthquake ground motion based on orthogonal Hilbert spectrum     

HU Canyang  CHEN Qingjun  XU Qingyang 《保鲜与加工》2012,(12):100-105

A new method is proposed for the simulation of nonstationary stochastic earthquake ground motion based on orthogonal Hilbert-Huang transform (OHHT) spectra of its sample observations. Orthogonal EMD method is introduced to treat with IMF. OHHT avoids leakage of energy compared with conventional HHT, and it can be used for analysis of nonstationary signal. The average of the Hilbert spectra over the samples is defined as the Hilbert spectrum of the earthquake motion process and used as the target in the simulation of the process. Random Phase is also introduced to simulate nonstationary earthquake. The statistic characteristics function of stochastic process is given in the paper. Simulations of two earthquake ground motion are carried out. The results show that the samples can accurately reflect amplitude and frequency nonstationary of records. Samples and record of same earthquake ground motion process have same statistic characteristics.  相似文献   

基于ETABS结构分析软件的框架结构耗能减震分析     

张荣花  孙建刚  郭巍  王伟玲 《黑龙江八一农垦大学学报》2012,24(6):13-15

为了研究阻尼器在高层建筑中的耗能减震效果,基于ETABS有限元分析程序,采用非线性动力时程分析方法对使用粘滞阻尼器的某高层建筑进行了7度地震作用下结构的地震响应分析。结构地震反应分析表明,结构在附加耗能器状态下,位移、层间位移角、剪力都有所降低。阻尼器明显起到了耗能减震作用。  相似文献   

地震前兆数据分析与精确预警系统的研究     

赵德才  赵睿  刘涛  谢博扬  李小军  王锐  马鹏程 《河北北方学院学报(自然科学版)》2012,(4):33-37

通过研制一种数据采集和上传设备,这种设备可以把数据上传到远程服务器,在服务器上利用分析软件可以预知地震将要发生的地点、时间和强度。设备中使用了GPS卫星定位系统,为数据的精确性提供了保证。通过这种探索有望找到一条预报地震的新途径。  相似文献