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Damage Identification in Footbridges from Natural Frequency Measurements

Journal of Civil Engineering and Architecture 2015年第8期9卷 919-925页

作者： Ivana Mekjavic domagoj damjanovic Department of Structures Faculty of Civil Engineering University of Zagreb Zagreb 10000 Croatia Department of Engineering Mechanics Faculty of Civil Engineering University of Zagreb Zagreb 10000 Croatia

The present study aims to develop a robust structural damage identification method that can be used for the evaluation of bridge structures. An approach for the structural damage identification based on the measurement of natural frequencies is presented. The structural damage model is assumed to be associated with a reduction of a contribution to the element stiffness matrix equivalent to a scalar reduction of the material modulus. A computational procedure for the direct iteration technique based on the non-linear perturbation theory is proposed to identify structural damage. The presented damage identification technique is applied to the footbridge over the Slunjcica River near Slunj to demonstrate the effectiveness of the proposed approach. Using a limited number of measured natural frequencies, reduction in the stiffness of up to 100% at multiple sites is detected. The results indicate that the proposed approach can be successful in not only predicting the location of damage but also in determining the extent of structural damage.

关键词：频率测量损伤识别人行桥结构损伤识别方法刚度矩阵桥梁结构弹性模量

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Sediment regime of the Danube River in Serbia

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International Journal of Sediment Research 2013年第4期28卷 470-485页

作者： Marina BABIC MLADENOVIC Vasiljka KOLAROV Vanja damjanovic Jaroslav Cerni Institute for the Development of Water Resources Department for River Engineering

The total length of the Danube section in Serbia is 587.5 km,and it has three specific sections:(1) Pannonian Plain Danube(or the Middle Danube) has all characteristics of lowland *** stretch downstream of Novi Sad is under the influence of the Iron Gate 1 backwater during low water flows;(2) Iron Gate Danube,where the river is confined in the *** it is a reservoir,with completely altered natural characteristics.(3) Western Pontic Danube(or the Lower Danube),downstream of the *** paper presents the sediment regime in the Serbian sector of the Danube River,both upstream and within the Iron Gate *** field investigation data were used to describe the most important parameters of sediment transport and deposition processes,including riverbed composition and suspended sediment characteristics(grain size and concentration).The influence of large tributaries of the Danube(the Tisza,the Sava,and the Velika Morava) is also *** conducted in the Iron Gate 1reservoir under the Sediment Regime and Morphological Changes Monitoring Program is also *** obtained during implementation of the Program form the basis for the description of changes in the Danube sediment regime that occurred following erection of the Iron Gate *** revealed that the most important consequence of the Iron Gate I IIPNS Dam is permanent deposition of sediment in the Iron Gate Gorge portion of the reservoir,the water and environmental management implications of which are becoming increasingly ***,upstream stretches of the reservoir are not subject to uniform sedimentation processes;instead,the sediment regime depends on current hydrologic and hydraulic conditions within the watercourse and/or the hydro-power plant operating mode.

关键词： Sediment regime Morphological changes Danube Serbia

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COMMON FIXED POINT THEOREMS FOR MULTI-VALUED MAPS

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Acta Mathematica Scientia 2012年第2期32卷 818-824页

作者： Boško damjanovic Bessem Samet Calogero Vetro Department of Mathematics Faculty of AgricultureNemanjina 6BelgradeSerbia Universitéde Tunis Département de MathématiquesEcole Supérieure des Sciences et Techniques de Tunis Department of Mathematics and Informatics University of PalermoVia Archirafi3490123 PalermoItaly

We establish some results on coincidence and common fixed points for a twopair of multi-valued and single-valued maps in complete metric spaces. Presented theorems generalize recent results of Gordji et al [4] and sev... 详细信息

关键词： Coincidence point common fixed point multi-valued maps

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Requirements Quality Online Courses

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Intelligent Information Management 2014年第3期6卷 89-96页

作者： Dragan damjanovic Master of Science ZrenjaninSerbia

Every day on the Internet appear online courses (good, bad, free, expensive, legal, illegal, ...). They can be of great benefit, especially to people who, because of a lack of free time can not attend face-to-face teaching, and have a duty of continuous professional development. In this great offer, it is really difficult to choose the right one that will fully meet the strict criteria. In this paper, we point to the conditions and requirements that may significantly facilitate students making their final decision regarding the selection of different forms of online training.

关键词： Courses Online Quality Requirements

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铁托自述 1

铁托自述

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1984年

作者：（南）达姆扬诺维奇（P.damjanovic）编达洲译

书名原文:*** Autobiografska Kazivanja

ISBN: (纸本)3203·059

书名原文:*** Autobiografska Kazivanja

关键词：铁托学科传记

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铁托自述

铁托自述

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作者： P.·达姆扬诺维奇(P. damjanovic)

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Measurements of Environmental Radon Activity Concentration Outdoors in Bosnia and Hercegovina

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材料科学与工程（中英文A版） 2015年第9期5卷 331-338页

作者： Alma damjanovic Jasmin Adrovic Zejnil Tresnjo Feriz Adrovic The International School of The Hague 2505 CA 2505 CA The Hague The Netherlands University of Tuzla Faculty of Natural Sciences and Mathematics Univerzitetska 4 Tuzla Bosnia and Herzegovina University Dzemal Bijedic of Mostar Sjeverni logor bb 88104 Mostar Bosnia and Herzegovina

Radon is a unique natural element because it is an inert gas and at the same time radioactive in all of its isotopes. It is known fact that exposure of the population to high concentrations of radon gas, leads to irradiation of primarily respiratory organs, which can cause lung cancer. For reliable prospecting of radon activity concentration in the living environment, the first input parameter is the concentration of outdoor radon in the air. This paper presents the results of a three-year research of radon activity concentration in the air of Bosnia and Herzegovina. At the measurement locations were registered daily and seasonal variations of the outdoor radon concentrations, whose average values were in the range of 15-38 Bq/m3. They were measured with Alpha GUARD PQ 2000 radon portable measuring system (Genitron Instruments - Frankfurt).

关键词：氡浓度测量波斯尼亚生活环境户外室外空气惰性气体自然元素呼吸器官

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