基于BIM的建筑地震受损程度评估模型设计          下载免费PDF全文

赵全斌  师煜  邹秋元  王成 《地震工程学报》2019,41(1):227-232

由于在变形和累积耗能的建筑地震受损程度评估模型,是将建筑划分为五个状态水平,未研究建筑环境性能,评估结果误差较大。因此设计基于BIM的建筑地震受损程度评估模型,采用基于BIM的建筑环境研究与评估方法,考虑建筑环境性能,基于这个思路,依据混凝土单轴Mazars损伤模型,获取三轴状态中的损伤演化方程,得到应变大于损伤阈值时损伤演化方程增量形式,构建混凝土损伤评估模型。经实验证明,所设计模型在地震峰值加速度小于0.31g时,建筑结构大致无缺,在峰值加速度是0.61g时,建筑地震受损指数超过0.8,建筑倒塌;所设计模型评估的平均误差低于0.03,平均评估时间是2.86 s,说明所设计模型能够有效评估建筑地震受损程度,且精度和效率较高。  相似文献   

基于网络控制板的地震台站远程电源监控系统     

李惠玲  高云峰  胡玉良  程冬焱  李颖  王鹏伟  穆慧敏 《地震地磁观测与研究》2019,40(6):152-159

针对无人值守地震台站逐年增加,运行维护模式不佳的现状,设计一种远程电源监控系统,采用远程电源控制模块,设计软件通过TCP/IP协议,在仪器出现死机时,远程实现设备的断电重启。本文对该系统的设计思路、硬件构成进行描述,并简要介绍软件功能设计、监控告警以及该系统在无人值守台站的应用。实践证明,该系统可有效解决因仪器死机造成的观测数据缺记,为地震专业设备的可靠运行和及时维护提供依据与保障,为今后地震台站,特别是无人值守台站的维护提供借鉴。  相似文献   

离散Fréchet距离在强震台站场地分类中的应用     

梁基冠  程印  赵岑 《震灾防御技术》2019,14(4):731-741

当强震台站场地资料不完整时,所收集到的强震数据因缺乏准确的场地类别信息而难以有效利用。为解决这一问题,本文提出一种基于离散Fréchet距离的强震台站场地分类方法。将获取到的664个KiK-net台站场地按照《建筑抗震设计规范（GB 50011—2010）》进行分类,并构建2个数据集。利用数据集1得到Ⅰ、Ⅱ、Ⅲ类场地标准谱比曲线,并结合离散Fréchet距离对数据集2中的台站进行场地分类,统计分类成功率与误判率。统计结果表明,本文方法能较准确地对场地进行分类,且误判率在可接受范围内。将本文方法分类统计结果与斯皮尔曼秩相关系数法分类的成功率与误判率进行对比,结合本文方法分类后得到的平均谱比曲线,均可表明应用本文方法进行强震台站场地分类具有合理性。  相似文献   

An Amended Chemical Mass Balance Model for Source Apportionment of PM2.5 in Typical Chinese Eastern Coastal Cities     

Qiaoli Wang  Nana Cheng  Sujing Li  Minli Dong  Xiangqian Wang  Linlin Ge  Tianjiao Guo  Wei Li  Xiang Gao 《洁净——土壤、空气、水》2019,47(2)

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云南测震台网地震监测能力分析   总被引：2，自引：1，他引：1  

曹舸斌  蔡明军  李文涛  程旭东  马红虎  党文杰 《地震地磁观测与研究》2019,40(2):71-76

2018年1月云南省测震台网示范工程20个新增测震台建设完成,选取原有48个台以及新增20个台连续48小时数据记录,基于近震震级公式,计算并网前后云南省测震台网的地震监测能力,对比测震台增加前后的地震监测能力,发现:云南省地震监测能力由ML 2.2提升到ML 1.6,局部地区由ML1.4提升到ML0.8。  相似文献   

Subsistence strategies of prehistoric hunter-gatherers on the Tibetan Plateau during the Last Deglaciation   总被引：1，自引：0，他引：1  

Wang  Jian  Xia  Huan  Yao  Juanting  Shen  Xuke  Cheng  Ting  Wang  Qianqian  Zhang  Dongju 《中国科学:地球科学(英文版)》2020,63(3):395-404

The study of prehistoric hunter-gatherer subsistence strategies on the Tibetan Plateau is important for understanding the mechanisms and processes of human adaption to high altitude environments.But to date,only a few Paleolithic sites have been found on the Tibetan Plateau with clear stratigraphy and reliable dating.These sites are mainly distributed in the Qinghai Lake Basin on the northeastern part of the plateau,and the sporadic fauna and flora remains excavated provide limited information about the subsistence strategies of hunter-gatherers.In 2014,relatively abundant animal remains were unearthed in the Lower Cultural Layer (LCL,15400-13100 cal yr BP) of the"151 site"located in the Qinghai Lake Basin,providing important information about human subsistence strategies on the Tibetan Plateau during the Last Deglaciation.Zooarchaeological analysis of these faunal remains indicates that hunter-gatherers at the"151 site"mainly targeted large ungulates of Bos and wild horse/ass,and only brought back the most nutritious parts of animal carcasses including upper and intermediate limb bones,heads,and trunks (ribs and vertebrae).People then processed and consumed the carcasses around single hearths.Our comprehensive analyses of contemporaneous sites in the Qinghai Lake Basin show that a subsistence strategy involving opportunistic hunting of ungulates,high mobility,and short occupation of campsites was used by terminal Pleistocene huntergatherers to adapt to the high-altitude environment on the Tibetan Plateau.This subsistence strategy may have been a first step of gradual hunter-gatherer adaptation to the extreme conditions on the Tibetan Plateau after the Last Glacial Maximum,and laid the foundation for the widespread distribution of hunter-gatherers on the plateau during the Holocene.  相似文献   

Imaging the rupture process of the 10 January 2018 MW7.5 Swan island,Honduras earthquake*          下载免费PDF全文

Chuang Cheng  Dun Wang 《地震科学（英文版）》2020,33(4):194-200

The 10 January 2018 M_W7.5 Swan island, Honduras earthquake occurred on the Swan island fault, which is a transform plate boundary between the North American and Caribbean plates. Here we back-project the rupture process of the earthquake using dense seismic stations in Alaska, and find that the earthquake ruptured at least three faults (three stages) for a duration of ~40 s. The rupture speed for the longest fault (stage 3) is as fast as 5 km/s, which is much faster than the local shear wave velocity of ~4 km/s. Supershear rupture was incidentally observed on long and straight strike-slip faults. This study shows a supershear rupture that occured on a strike-slip fault with moderate length, implying that supershear rupture might commonly occur on large strike-slip earthquakes. The common occurrence of supershear rupture on strike-slip earthquakes will challenge present understanding of crack physics, as well as strong ground motion evaluation in earthquake engineering.  相似文献   

Spatio-temporal differentiation of spring phenology in China driven by temperatures and photoperiod from 1979 to 2018     

Wu  Xiaojing  Cheng  Changxiu  Qiao  Cancan  Song  Changqing 《中国科学:地球科学(英文版)》2020,63(10):1485-1498

Large amounts of data accumulated in ecology and related environmental sciences arouses urgent need to explore useful patterns and information in it. Here we propose coclustering-based methods and a temperatures-photoperiod driven phenological model to explore spatio-temporal differentiation in long-term spring phenology in China. First, we created the first bloom date(FBD) dataset in China from 1979 to 2018 using the extended spring indices and China Meteorological Forcing Dataset. Then we analyzed the dataset using Bregman block average co-clustering algorithm with I-divergence(BBAC_I) and kmeans algorithm. Such analysis delineated the spatially-continuous phenoregions in China for the first time. Results showed three spatial patterns of FBD in China and their temporal dynamics for 40 years(1979–2018). More specifically, overall late spring onsets occur in 1979–1996, in which areas located in Jiangxi, northern Xinjiang and middle Inner Mongolia experienced constant changing spring onsets. Overall increasingly earlier spring onsets occur in 1997–2012, in which areas located in Fujian,Hunan and eastern Heilongjiang experienced the most variable spring onsets. Stable early spring onsets over China occur after 2012. Results also showed 15 temporal patterns of spring phenology over the study period and their spatial delineation in China.More specifically, most areas in China have the same FBD category for 40 years while northern Guizhou, Hunan and southern Hubei have the same category in 1979–1997 and then fluctuate between different categories. Finally, our results have certain directive significance on the design of existing observational sites in Chinese Phenological Network.  相似文献   

基于星载SAR信号的TEC反演新方法          下载免费PDF全文

王成  张民  许正文  毛聪  陈春 《地球物理学报》2014,57(11):3570-3576

由于星载合成孔径雷达(SAR)系统工作于电离层之上,其信号不可避免地将受到电离层的影响. 背景电离层以及电离层电子密度不规则体多重散射效应可引起距离向图像质量的下降, 在强起伏情况下, 多重散射效应对信号的延迟影响不可忽略. 针对此问题, 本文提出了一种基于SAR回波信号的三频相位自适应TEC反演新方法, 利用反演的结果对电离层的影响进行校正. 给出了校正前后的点目标成像仿真, 结果显示此方法充分考虑了多重散射效应引起的TEC估计误差, 可以有效地补偿电离层对距离向成像的影响, 提高了距离向点目标图像质量.  相似文献   

灰色误差理论在岩矿测试数据处理中的应用   总被引：1，自引：2，他引：1  

陈月源  曹成东  袁秀茹  魏轶  谈建安 《岩矿测试》2009,28(6):576-582

介绍了灰色误差理论,并应用于岩矿测试数据基本处理。结果表明,在误差变化范围小的岩矿化学分析中,测量数据的累加曲线为线性关系,在元素不均匀性分布的岩矿化学分析(例如不均匀性金的测试)和岩石强度试验等分散性大的测试中,测量数据的累加曲线为曲线关系,但灰色标准偏差和传统统计学的标准偏差非常接近。该方法简单易行,具有相当的精度和较强的实用性,对测量数据少或难于寻求统计规律的测量过程尤为实用,是一种新的尝试。  相似文献