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Theoretical and Numerical Analyses of Steel-timber Composite Beams with LVL Slabs 带LVL板的钢-木组合梁的理论与数值分析
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-27 DOI: 10.59440/ceer/172510
Julia Strzelecka, Łukasz Polus, Marcin Chybiński
Recently conducted studies have shown that significant benefits are to be gained by joining steel beams and timber slabs. Steel-timber composite beams present a sustainable solution for the construction industry because of their high strength and stiffness, and lower carbon footprint and self-weight than steel-concrete composite beams. The behaviour of steel-timber composite beams is still being investigated to reduce knowledge gaps. This paper presents theoretical and numerical analyses of steel-timber composite beams consisting of steel girders and laminated veneer lumber slabs. The elastic and plastic resistance to bending were estimated analytically based on the elastic analysis and the rigid-plastic theory. The impact of the composite action, the LVL slab thickness, the cross-section of a steel girder and the steel grade on resistance to bending was evaluated. The load-deflection curve of the composite beam was obtained using a 2D finite element model, in which timber failure was captured using the Hashin damage model. The results of the numerical simulation were in good agreement with the ones of the theoretical analyses.
最近进行的研究表明,通过连接钢梁和木板可以获得显著的好处。钢-木复合梁为建筑行业提供了可持续的解决方案,因为它们具有高强度和刚度,比钢-混凝土复合梁的碳足迹和自重更低。钢木组合梁的性能仍在研究中,以减少知识差距。本文对由钢梁和贴面板组成的钢-木组合梁进行了理论和数值分析。在弹性分析和刚塑性理论的基础上,对弯曲的弹塑性阻力进行了解析估计。评估了复合作用、LVL板厚度、钢梁截面和钢种对抗弯性能的影响。采用二维有限元模型获得了组合梁的荷载-挠度曲线,其中木材破坏采用Hashin损伤模型。数值模拟结果与理论分析结果吻合较好。
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引用次数: 0
Dental Waste - Management and Statistics 牙科废物-管理及统计
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-26 DOI: 10.59440/ceer/172514
Martyna Myszograj
Waste management is a crucial issue in the contemporary world, playing a significant role in the fight against environmental problems. Inadequate waste management leads to the pollution of air, water, and soil with toxic and harmful substances and to the emission of greenhouse gases, thereby contributing to climate change, the reduction of biodiversity, and the destruction of ecosystems, as well as to the emergence of diseases and allergies in animals. The management of waste is primarily determined by its type and source, with recycling, incineration, and landfilling being the most common methods. The healthcare sector, with limited opportunities for waste reduction, has its own unique approach to waste management. In particular, dental waste presents a considerable environmental risk due to the hazardous and toxic substances it contains. A prime example of such substances is mercury (Hg), a toxic and bioaccumulative metal that was commonly used in dental amalgam for over a century. With the available statistical data, it is possible to recognize that dentistry can pose a serious threat to the environment, and steps can be taken to control and reduce the production of toxic waste and its potential impact on the environment.
废物管理是当今世界的一个关键问题,在解决环境问题方面发挥着重要作用。废物管理不当导致有毒和有害物质污染空气、水和土壤,并排放温室气体,从而导致气候变化、生物多样性减少、生态系统遭到破坏,并导致动物出现疾病和过敏。废物的管理主要取决于其类型和来源,回收、焚烧和填埋是最常见的方法。医疗保健部门减少废物的机会有限,因此有自己独特的废物管理办法。特别是牙科废物,由于其所含的有害和有毒物质,对环境构成相当大的风险。这类物质的一个主要例子是汞(Hg),这是一种有毒的、具有生物蓄积性的金属,一个多世纪以来一直普遍用于牙科汞合金。根据现有的统计数据,可以认识到牙科可能对环境构成严重威胁,并且可以采取措施控制和减少有毒废物的产生及其对环境的潜在影响。
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引用次数: 0
The uniqueness of the German barracks in the context of the style of military architecture in the interwar period. 德国兵营在两次世界大战期间军事建筑风格背景下的独特性。
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-17 DOI: 10.59440/ceer/171657
Marta Małgorzata Rudnicka-Bogusz
When studying the styles of barracks complexes in Eastern Europe, one can notice two main periods of heightened militarism. The large-scale barracks built in the 1880s represent a style infused with national romanticism. In Prussia, for example, it is Rundbogenstil, which legitimizes monarchical power. As a result of the defeat in World War I, this style is compromised. With the beginning of the 1930s, the tendency to build extensive barracks complexes intensifies again. The buildings erected at that time reflect the tendency to modernize architecture, characterized by functional and hygienic layout of rooms and a cubic style. This tendency is also evident in German barracks, such as those in Wrocław, designed by Otto Salvisberg, and Swiss barracks in Lucerne, designed by Armin Meili. However, due to the tightening of the nationalist rhetoric by the ruling NSDAP, as witnessed by the "Entartete Kunst" exhibition held in Munich in 1937, the international style is rejected in Germany, which was unprecedented at the time. A new style is sought, and the Heimatstil based on vernacular patterns developed in the 1870s fits in with the populist inclinations of the Third Reich. As a result, the design of barracks complexes sees a return to a simplified historicizing style, which then gives way to buildings that represent the biased national style of Heimatschutz, expressiing the polarization of public discourse along the lines of: cosmopolitan "them" and domestic "us".
在研究东欧兵营建筑群的风格时,人们可以注意到军国主义高涨的两个主要时期。建于19世纪80年代的大型兵营代表了一种充满民族浪漫主义色彩的风格。例如,在普鲁士,正是Rundbogenstil使君主权力合法化。由于第一次世界大战的失败,这种风格受到了损害。随着20世纪30年代的开始,建造大规模兵营的趋势再次加剧。当时建造的建筑物反映了建筑现代化的趋势,其特点是房间的功能和卫生布局,以及立方体的风格。这种趋势在德国兵营中也很明显,比如由Otto Salvisberg设计的Wrocław兵营,以及由Armin Meili设计的瑞士卢塞恩兵营。然而,由于执政的纳粹党民族主义言论的收紧,如1937年在慕尼黑举办的“Entartete Kunst”展览所见证的,国际风格在德国被拒绝,这在当时是前所未有的。人们寻求一种新的风格,而基于19世纪70年代发展起来的本土图案的Heimatstil符合第三帝国的民粹主义倾向。因此,军营综合体的设计回归到一种简化的历史化风格,然后让位于代表Heimatschutz有偏见的民族风格的建筑,表达了公共话语的两极分化:世界主义的“他们”和国内的“我们”。
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引用次数: 0
Measures To Mitigate The Main Causes Of Social Hoising Delays In Algeria 减轻阿尔及利亚社交活动延误主要原因的措施
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-08 DOI: 10.59440/ceer/172022
Zemra Rachid
Social housing in Algeria is carried out with state budget funds in order to eliminate social inequalities and guarantee a decent life to the citizen. However, delays have been observed in the realization. This study aims to examine the main causes and develop guidelines to effectively mitigate delays. Through an in-depth analysis of the literature and formal interviews on the topic of potential risks with construction experts, a list of 67 delay factors was identified. Data was collected through an online questionnaire via Google Forms and semi-structured interviews of a sample professionals established in Algeria. A total of 59 valid responses were analyzed and classified by SPSS software. The results indicate that the 5 most critical causes are: "Delay in payment", "Slow change orders in extra works", "Ineffective planning and scheduling", "Slow change orders in extra quantities", and "Difficulties in financing the project by contractor". Though, the correct implementation of the measures suggested by this study allows government authorities and professionals to deal with the 10 most critical causes that have favored the occurrence of delays in order to successfully implement similar construction projects.
阿尔及利亚的社会住房是由国家预算资金提供的,目的是消除社会不平等,保证公民过上体面的生活。然而,在实现过程中观察到延迟。本研究旨在检查主要原因,并制定有效减轻延误的指导方针。通过对文献的深入分析和对建筑专家潜在风险主题的正式访谈,我们确定了67个延迟因素。数据是通过谷歌表格的在线问卷和对在阿尔及利亚建立的样本专业人员的半结构化访谈收集的。采用SPSS软件对59份有效问卷进行分析和分类。研究结果表明,最关键的5个原因分别是:“付款延迟”、“额外工程变更订单慢”、“计划和调度无效”、“额外数量变更订单慢”和“承包商融资困难”。尽管如此,正确实施本研究建议的措施可以让政府当局和专业人士处理10个最关键的原因,这些原因有利于延迟的发生,以便成功实施类似的建设项目。
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引用次数: 0
ANALYSIS OF STRUCTURAL SOLUTIONS FOR RADIATORS IN BUILDINGS 建筑散热器结构解决方案分析
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-08 DOI: 10.59440/ceer-2023-0010
Leszek BARGŁOWSKI, Mariusz ADAMSKI, Maksym REBMAN
In the following article emphasizes the analysis of technical and economic criteria for radiators, that will help you make the right choice of radiator type. Different solutions for heating flats are presented, the focus is on water-fed radiator solutions. After detailed analysis, the evaluation criteria are selected: indicators of the unit heat output of a radiator related to the mass, volume and length of the radiator QM, QV, QL. Radiator types, nominal working parameters, evaluations criteria and techno-economic analysis of structural solutions for radiators on the example of a residential building are presented.
在下面的文章中着重分析散热器的技术和经济标准,这将有助于您正确选择散热器类型。提出了不同的公寓供暖解决方案,重点是供水散热器解决方案。经过详细分析,确定了评价标准:散热器单位热量输出指标与散热器质量、体积、长度QM、QV、QL有关,并以某住宅楼为例,介绍了散热器类型、标称工作参数、评价标准及散热器结构方案的技术经济分析。
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引用次数: 0
Innovation in the Lubusz region. Implementation of an innovation managment system. Lubusz地区的创新。实施创新管理制度。
IF 0.7 Q4 ENGINEERING, CIVIL Pub Date : 2023-08-24 DOI: 10.59440/ceer/171326
Joanna Malon
The article reveals the potential of innovation management in regions on the example of the Lubusz Voivodeship. The aim of the article is to analyse the latest activities and initiatives supporting innovation in the Lubusz Voivodeship. To this end, it was important to identify the nature of the implementation process of innovative solutions, which may be recognised as political, i.e.: characterised by top-down initiatives and bottom-up implementation. The method of document analysis was used in the study, including primary and secondary sources. As a result, conclusions and recommendations for regional policy to support innovation were drawn. They indicate the need to use the scientific potential of the University of Zielona Góra and other scientific and research institutions. They also reveal the need to strengthen the cooperation of the local self - government with the University for the development of innovation and creation of partnership networks in the region.
本文以鲁busz省为例,揭示了区域创新管理的潜力。本文的目的是分析支持创新的最新活动和倡议在卢busz省。为此目的,重要的是确定创新解决办法的执行过程的性质,这可能被认为是政治性的,即以自上而下的倡议和自下而上的执行为特点。本研究采用文献分析法,包括一手资料和第二手资料。结果,得出了支持创新的区域政策的结论和建议。它们表明需要利用锡洛纳大学Góra和其他科学和研究机构的科学潜力。他们还表明,有必要加强地方自治政府与大学的合作,以发展该地区的创新和建立伙伴关系网络。
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引用次数: 0
ANALYSIS OF THE LOCAL PRECIPITATION TRENDS IN THE PODKARPACKIE AND LUBUSKIE VOIVODESHIPS podkarpackie省和lubuskie省局部降水趋势分析
Q4 ENGINEERING, CIVIL Pub Date : 2023-08-22 DOI: 10.59440/ceer-2023-0009
Katarzyna KUBISZYN
The type of precipitation is one of the factors taken into consideration when deciding on the most optimal drainage system. Drainage systems are used to prevent the landslides caused by water erosion. Rainfall affect the rate of infiltration and the intensity of surface runoff and thus the occurrence, course and effectiveness of erosion processes [1, 2, 3]. Knowledge of local precipitation trends will help to apply precautions and thus minimise the risk of adverse events such as landslides. What is more it can help more effectively manage projects risks and costs. The aim of this study was to analyse more than 30 years of data from daily rainfall measurements from the Podkarpackie Voivodeship and to check whether the occurrence of precipitation is a random event or whether it indicates long-term trends that may affect changes in ground stability. The non-parametric Mann-Kendall test and correlation test were used for the analysis.
在确定最优排水系统时,降水类型是要考虑的因素之一。排水系统是用来防止水蚀引起的滑坡。降雨影响入渗速率和地表径流强度,从而影响侵蚀过程的发生、过程和有效性[1,2,3]。了解当地降水趋势将有助于采取预防措施,从而最大限度地减少发生山体滑坡等不利事件的风险。更重要的是,它可以帮助更有效地管理项目风险和成本。这项研究的目的是分析来自Podkarpackie Voivodeship的30多年的每日降雨量测量数据,并检查降水的发生是随机事件还是表明可能影响地面稳定性变化的长期趋势。采用非参数Mann-Kendall检验和相关检验进行分析。
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引用次数: 0
THE INFLUENCE OF THE PRESENCE OF IRON IN HIGHLY ALKALINE POLYALUMINIUM CHLORIDES ON THE EFFECTIVENESS OF PRECURSORS OF DISINFECTION BY-PRODUCTS REMOVAL 高碱性聚合氯化铝中铁的存在对消毒副产物前体去除效果的影响
Q4 ENGINEERING, CIVIL Pub Date : 2023-08-02 DOI: 10.59440/ceer-2023-0008
Izabela KRUPIŃSKA
The mechanism of coagulation with highly alkaline polyaluminum chlorides is well understood, but there is a lack of information on the effect of the presence of iron in these coagulants on the efficiency of purifying water with increased contents of natural organic matters among which humic substances are precursors of disinfection by-products. The dissolved forms of organic substances are the most problematic with regard to water treatment because major concern is the formation of disinfection by products resulting from reactions between dissolved organic matter fractions and disinfectants. The aim of this study was to evaluate the effectiveness of precursors of disinfection by-products removal using highly alkaline polyaluminium chlorides that had different alkalinity and iron content. In the water after the coagulation process a value of SUVA254 was calculated because this indicator correlates well with dissolved organic matter reactivity and disinfection by-products. The analysis of the obtained results showed that the effectiveness of dissolved organic matter removal was determined by the formation of colored iron-organic complexes.
高碱性聚合氯化铝的混凝机理已被充分了解,但这些混凝剂中铁的存在对天然有机物(其中腐殖质是消毒副产物的前体)含量增加的水的净化效率的影响还缺乏信息。在水处理方面,有机物质的溶解形式是最成问题的,因为主要的问题是溶解的有机物质和消毒剂之间的反应所产生的消毒副产物。本研究的目的是评价使用不同碱度和铁含量的高碱性聚合氯化铝去除消毒副产物前体的有效性。在混凝处理后的水中,计算了SUVA254的值,因为该指标与溶解有机物的反应性和消毒副产物有很好的相关性。对所得结果的分析表明,溶解有机物的去除效果是由有色铁有机配合物的形成决定的。
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引用次数: 0
MEASURING LIGHT POLLUTION IN THE NIGHT SKY – FROM TECHNOLOGY DEMONSTRATOR TO MONITORING SYSTEM 测量夜空中的光污染——从技术演示到监测系统
IF 0.7 Q4 ENGINEERING, CIVIL Pub Date : 2023-06-20 DOI: 10.59440/ceer-2023-0004
Dominika Karpińska, Mieczysław Kunz
Pollution of the night sky by artificial light has now become an important element of the modern city landscape. The decline in the quality of the sky observed at night in urban areas has already been noticed even by residents unaware of its origin. A starry sky is nowadays not easy to observe even in places far from large conurbations or smaller cities. More and more places are losing access to the previously natural privilege of observing the dark sky, and their inhabitants are thus systematically exposed to all the direct and indirect negative effects of this phenomenon. Monitoring the brightness of the night sky is gaining interest from a growing number of interdisciplinary research groups being established around the world, including Poland. In Toruń, the first measurements of the magnitude of this phenomenon, together with the determination of its spatial scale, were started using handheld devices in 2017. In the following years, efforts were made to improve the data acquisition process by creating a prototype – a technology demonstrator and, consequently, a commercial version of an automatic device measuring the surface brightness of the night sky. This paper presents the stages of the project aimed at developing a light pollution monitoring system, which has been consistently implemented in Toruń. The most important component of this system is a measuring device of our own design and construction. The monitoring system designed and operating in Toruń, starting in 2019, is being further developed with new components and monitoring (measurement) sites being systematically added, making the city’s observation network increasingly dense. The devices built using the LoRa standard for wireless data exchange implement the concept of the Internet of Things, fitting in with the objectives of a smart city.
人造光对夜空的污染已成为现代城市景观的重要组成部分。在城市地区观测到的夜间天空质量的下降,即使是不知道其来源的居民也已经注意到了。如今,即使在远离大城市或小城市的地方,也很难看到满天的星星。越来越多的地方失去了以前观察黑暗天空的天然特权,因此,这些地方的居民系统地暴露在这种现象的所有直接和间接的负面影响之下。监测夜空亮度正引起包括波兰在内的世界各地越来越多的跨学科研究小组的兴趣。在托鲁瓦,2017年开始使用手持设备对这一现象的规模进行首次测量,并确定其空间尺度。在接下来的几年里,人们努力改进数据采集过程,创造了一个原型——一个技术演示,从而成为一个商业版本的自动测量夜空表面亮度的设备。本文介绍了旨在开发光污染监测系统的项目的各个阶段,该系统一直在托卢奇实施。该系统最重要的组成部分是我们自己设计和制造的测量装置。从2019年开始,在托卢佐夫设计和运行的监测系统正在进一步发展,系统地增加了新的组件和监测(测量)站点,使该市的观测网络越来越密集。使用LoRa标准构建的设备用于无线数据交换,实现了物联网的概念,符合智慧城市的目标。
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引用次数: 0
AUGMENTED AND VIRTUAL REALITIES: THE FUTURE OF BUILDING DESIGN AND VISUALIZATION 增强现实与虚拟现实:建筑设计与可视化的未来
IF 0.7 Q4 ENGINEERING, CIVIL Pub Date : 2023-06-16 DOI: 10.59440/ceer-2023-0002
DivyarajSinh M. Solanki, Hrushikesh Laddha, M. Z. Kangda, E. Noroozinejad Farsangi
The present study precisely conveys the methodology of developing a three-dimensional (3D) architectural model of a villa with its walk-through and displaying the model in virtual reality, which as a result, be used by the clients to spectate, customize and buy the real estate property. Additionally, the case study highlights the advancement inarchitecture, as certain specifications of each element of a 3D model can be viewed in a virtual environment.Virtual reality is a transpiring platform, and in addition to that, the real-estate sector shows its incorporation in designing, marketing, and selling projects. The teaching and learning process can be eased out by intervening it with technology that generates an enhanced visualization environment. These technologies, when used constructively, save time and energy and also hoard economic standards ensuing lucrative benefits.
本研究精确地传达了开发一个别墅的三维(3D)建筑模型的方法,通过它的漫步和在虚拟现实中显示模型,结果,客户可以使用它来观看,定制和购买房地产。此外,案例研究强调了建筑的进步,因为3D模型的每个元素的特定规格可以在虚拟环境中查看。虚拟现实是一个不断发展的平台,除此之外,房地产行业在设计、营销和销售项目方面也表现出了它的结合。教学和学习过程可以通过产生增强的可视化环境的技术干预来缓解。当这些技术被建设性地使用时,不仅节省了时间和能源,而且还积累了经济标准,从而带来了丰厚的利益。
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引用次数: 0
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Civil and Environmental Engineering Reports
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