Dependence of correlations between spectral accelerations at multiple periods on magnitude and distance          下载免费PDF全文

A. Azarbakht  M. Mousavi  M. Nourizadeh  M. Shahri 《地震工程与结构动力学》2014,43(8):1193-1204

In this paper, the dependence of correlations between spectral accelerations at multiple periods on magnitude (M) and distance (R) has been investigated. For this purpose, a relatively large dataset of ground motion records (GMRs), containing 1551 records with a wide range of seismic characteristics, was selected. It is shown that the difference in the correlation coefficient is statistically meaningful when the general GMR dataset is divided into two subsets based on an arbitrary M or R. The observed difference is more meaningful in the case of magnitude when compared with distance. The general dataset of GMRs was then divided into four separate subsets based on optimum values of M and R, so that the four obtained subsets were given the greatest dissimilarity in terms of the correlation coefficients. The correlation coefficients between spectral accelerations at multiple periods were calculated in the case of the four subsets and compared with the available correlations in the literature. The conditional mean spectrum was also calculated by means of the conventional correlation coefficients, as well as by using the proposed M and R dependent correlation coefficients. The results show that, despite the commonly available findings in the literature, this dependence is significant and should not be neglected in the conditional spectra calculation process. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

Seismic assessment of damaged piloti‐type RC building subjected to successive earthquakes          下载免费PDF全文

Jiuk Shin  JunHee Kim  Kihak Lee 《地震工程与结构动力学》2014,43(11):1603-1619

Building structures damaged by a seismic event may be exposed to the risk of aftershocks or another event within a certain period. In this paper, the seismic assessment of damaged piloti‐type RC buildings was carried out to evaluate probabilistic retrofitting effects under successive earthquakes. First, a framework to evaluate the effectiveness of retrofitting was proposed, and then the proposed methodology was demonstrated with a structure retrofitted with buckling‐restrained braces (BRBs). For consideration of realistic successive earthquakes, past records measured at the same station were combined. Within the framework, a series of nonlinear time history analyses were performed for an as‐is model subjected to single earthquake, a damaged model subjected to successive earthquakes, and a damaged model retrofitted with BRBs subjected to successive earthquakes. In addition, fragility analysis was systematically applied in the framework for evaluation of effectiveness of the retrofitting strategy. The proposed framework was capable of quantifying the influence of successive earthquakes and evaluating the effectiveness of BRB retrofitting by considering the severity of the first earthquake damage and the hysteresis behavior of the retrofit element. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

典型矩形高层建筑风荷载与风振响应分析     

袁玲  张春梅  张夏萍  许伟  黄啟明 《华南地震》2014,(1):69-74

对典型矩形高层建筑进行风洞试验,根据试验结果计算了各风向角下的等效静风荷载和风振响应,同时采用《建筑结构荷载规范》(GB50009-2012)计算方法对该建筑正交角度下的风荷载进行计算,结合风洞试验风荷载与规范计算结果,研究典型矩形高层建筑等效静风荷载和加速度响应分布规律。结果表明:结构基底风致响应最不利角度并非完全出现在正交角度,风洞试验楼层风荷载整体趋势与规范计算结果相同,数值上存在差异,宜以风洞试验结果为准,该结构的顶层加速度响应小于高规限值,舒适度满足要求。  相似文献   

2014年新疆于田Ms7．3地震房屋震害分析     

孙静  伊力亚尔·阿不力孜  谭明  常想德  姚远  陈建波 《内陆地震》2014,(2):113-120

对于田2014年2月12日Ms7．3地震灾区各类房屋破坏现象进行了调查和整理,从房屋破坏、场地条件和房屋结构类型等几方面分析不同类型房屋的震害特征和震害原因,总结这次地震房屋的震害经验,提出今后抗震设防工作的几点建议。  相似文献   

超高层建筑风致振动的现场实测与数值模拟   总被引：1，自引：0，他引：1  

徐枫  陈文礼  肖仪清  段忠东  欧进萍 《地震学刊》2014,(1):51-57

通过采用现场实测和数值模拟方法,对某超高层建筑的风致振动特性进行研究。在建筑物顶部布置结构振动监测系统,对常态风和台风作用下的结构振动响应进行测量,分析加速度、位移幅值和结构的自振特性。以实测动力特性为基础,建立超高层建筑的等效气动弹性模型,采用平均风剖面入口,联合ANSYS和CFX对风场与建筑物的流固耦合振动进行数值模拟,得到不同顶部风速下,建筑物不同高度处的位移时程、气动力系数时程及频谱分析、尾流旋涡脱落模式。将数值模拟结果与现有的实测结果进行对比分析,表明该方法模拟流固耦合振动是可行的,并可为实际超高层建筑的抗风设计和舒适性计算提供技术依据。  相似文献   

高烈度区高层隔震结构抗拉处理方法研究     

吴从晓  ;赖伟山  ;周云  ;吴从永  ;邓雪松 《地震学刊》2014,(5):577-582

介绍了高层隔震结构抗倾覆计算方法,提出了高烈度区高层隔震结构抗拉处理方法,给出了其在ETABS软件中的模拟方法。通过实例对高烈度区高层非隔震结构和隔震结构的不同模型进行了动力时程分析。分析结果表明：各隔震结构模型周期基本相同,说明抗拉处理方法模拟是可行的;对于高烈度区高层隔震结构,当隔震支座出现拉力时,直接采用软件的单元进行模拟是不够合理的,应采用组合单元进行模拟;抗拉装置能较好地发挥抗拉的效果,避免隔震支座出现受拉情况。  相似文献   

应急抢险临时用房雷电防护     

李家启  任艳  何静  陈宏  黄亚敏 《气象科技》2012,40(3):502-506

在应急抢险救援中,临时用房的防雷安全一直为世人所关注。通过对临时用房特点阐述,分析了GB50057-1994的局限性,并采用IEC62305推荐方法对临时用房安装防雷装置进行判定分析。结果表明:GB50057-1994对建筑物防雷装置安装的判定指标不适用于临时用房,IEC62305推荐方法适用于临时用房安装防雷装置的判定;临时用房是否安装防雷装置与临时用房的大小尺寸和雷电日参数相关,在此基础上获得了临时用房雷电灾害风险值与其面积和周长、雷电日的关系式,为快速判定是否安装防雷装置提供理论依据。  相似文献   

云南省A号办公大楼智能化系统的综合防雷设计     

李勇进 《气象研究与应用》2012,33(2):92-94

根据云南省A号办公大楼的特点,分别采用大楼内、外部防雷的基本措施和方法进行综合防雷设计,达到了全面防雷的目的和效果。  相似文献   

一种利用反S数学模型自动确定地图目标分形无标度区的新方法     

蔡金华  龙毅  毋河海  陈丹 《测绘学报》2006,35(2):177-183,190

在观测尺度r的取值范围足够大时,地图目标的Richardson曲线往往呈现反S形态。根据这一特点,采用反S数学模型———带导数三次多项式模型拟合Richardson曲线,并根据该模型推导出分形无标度区间的计算公式,提出一种自动确定地图目标分形无标度区的新方法,最后通过实验验证本方法的可行性和有效性。  相似文献   

基于区间的移动设备地图缩放方法     

赵卫强  李景文  苏浩  罗文彬 《地理空间信息》2012,(2):163-165

针对移动设备中地图缩放方法的问题,提出了一种基于区间的地图缩放方法,并以Android和Google Maps为例,阐述了基于区间的地图缩放方法的实现过程,解决了缩放过程中速度近似误差问题,为移动设备中地图的缩放方法提供了一种新的思路。  相似文献