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Determination of Mechanical Properties of Soils Based on CPTU Data 基于CPTU数据的土体力学特性测定
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-01 DOI: 10.2478/acee-2023-0033
Iwona Chmielewska
Abstract The study aimed to interpret the results of cone penetration tests with pore pressure measurement (CPTU). Tests were performed on a section of the designed road about 200 m long. The subsoil under consideration was characterized by organic soils deposited to a depth of approximately 8 m. Due to the problematic soil and water conditions, improvement with geosynthetic encased columns (GEC) was performed. According to the Recommendations for Design and Analysis of Earth Structures using Geosynthetic Reinforcements – EBGEO, the constrained modulus E oed and effective friction angle φ’ of soil below the GEC column base should be higher than 5 MPa ( E oed > 5 MPa) and 30° ( φ’ > 30°), respectively. In this study, the E oed and φ’ parameters were determined based on CPTU tests conducted in 12 locations. Analysis of the CPTU data showed that the constrained modulus and effective friction angle of the soil deposited below the GEC column base did not meet EBGEO requirements in most locations. It was also concluded that the minimum value of the constrained modulus required by EBGEO is too low compared with the requested value of the effective friction angle.
摘要本研究旨在解释孔压测量(CPTU)锥入试验的结果。试验是在设计的一段约200米长的道路上进行的。所考虑的底土以有机土壤为特征,沉积深度约为8 m。由于土壤和水条件的问题,采用土工合成包壳柱(GEC)进行了改进。根据《土工合成材料加筋土工结构设计与分析建议- EBGEO》,GEC柱底部以下土体的约束模量eoed和有效摩擦角φ '应大于5 MPa (eoed >5 MPa)和30°(φ ' >分别为30°)。在本研究中,通过在12个地点进行CPTU试验,确定了eed和φ '参数。CPTU数据分析表明,在大多数位置,GEC柱底下土体的约束模量和有效摩擦角不满足EBGEO要求。与有效摩擦角的要求值相比,EBGEO要求的约束模量的最小值过低。
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引用次数: 0
Child-Friendliness of Urban Space in the Example of Łabędy 以Łabędy为例的城市空间儿童友好性
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-01 DOI: 10.2478/acee-2023-0031
Helena Szewiola
Abstract Children have long been a group whose needs and perspectives have been widely ignored in public spaces, despite several international legal documents and regulations proving their rights in the city. Based on those, child-friendliness criteria have been proposed and described. The established guidelines of: mobility and access, safety and security, attractiveness and comfort have been further explored through surveys conducted with minors. Subsequently, these criteria have been applied to the chosen district of Łabędy, to examine how they present in existing public spaces. The goal of the paper is to explore how child-friendliness criteria showcased in an average district and how average city development can create spaces and solutions that are friendly for children.
长期以来,尽管有一些国际法律文件和法规证明了儿童在城市中的权利,但儿童的需求和观点在公共空间中被广泛忽视。在此基础上,提出并描述了儿童友好标准。通过对未成年人的调查,进一步探讨了既定的准则:移动性和可及性、安全性和安全性、吸引力和舒适性。随后,这些标准被应用于Łabędy选定的区域,以检查它们如何在现有的公共空间中呈现。本文的目的是探讨如何在一个普通的地区展示儿童友好标准,以及一般的城市发展如何创造对儿童友好的空间和解决方案。
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引用次数: 0
Effect of Ureolytic Bacteria on Compressibility of the Soils with Variable Gradation 解尿菌对变级配土壤压缩性的影响
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-01 DOI: 10.2478/acee-2023-0040
Mariola Wasil, Urszula Wydro, Elżbieta Wołejko
Abstract The aim of this study is to present the effect of treatment with ureolytic bacteria ( Sporosarcina pasteurii ) on the compressibility parameters of mineral and anthropogenic soils. In the presence of the urease enzyme, secreted by a strain of Sporosarcina pasteurii bacteria, urea hydrolysis occurs, allowing CaCO 3 to be precipitated. The literature suggests applying the Microbially Induced Calcite Precipitation (MICP) method to non-cohesive soils. In order to determine whether the biomineralization process occurs in other soil types, cohesive and anthropogenic soils were tested in the laboratory. Compressibility tests were carried out in the laboratory on MICP-treated and untreated soils as reference samples. The process of biocementation in the soil is made possible by the introduction of bacteria into the soil and subsequent activation by a cementation solution (consisting of urea and calcium ions Ca 2+ ). This paper presents the methodology for introducing bacteria into the soil, as well as the effect of the biomineralization process on the deformation parameters of the tested materials.
摘要本研究旨在探讨溶尿菌(Sporosarcina pasteurii)处理对矿物土壤和人为土壤压缩性参数的影响。在由巴氏孢芽孢杆菌菌株分泌的脲酶存在的情况下,尿素发生水解,使caco3沉淀。文献建议将微生物诱导方解石降水(MICP)方法应用于非粘性土壤。为了确定生物矿化过程是否发生在其他土壤类型中,在实验室中测试了粘性土壤和人为土壤。在实验室对micp处理和未处理的土壤作为参考样品进行了压缩性试验。土壤中的生物胶结过程是通过将细菌引入土壤并随后由胶结溶液(由尿素和钙离子ca2 +组成)激活而实现的。本文介绍了将细菌引入土壤的方法,以及生物矿化过程对被测材料变形参数的影响。
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引用次数: 0
Adaptive Reuse Potential of Cultural Heritage: The Case of Istanbul Drapers’ Bazaar 文化遗产的适应性再利用潜力:以伊斯坦布尔布商市场为例
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-01 DOI: 10.2478/acee-2023-0029
Begüm Bayraktaroğlu, Pınar Öktem Erkartal
Abstract The main objective of the study is to investigate the possibilities of adaptive reuse for the protection of cultural heritage buildings. It aims to set Istanbul Drapers’ Bazaar (IDB), as an example of the buildings with similar characteristics and importance and for the cities hosting those structures upon an application of the AdaptSTAR method, which was developed to assess the conversion potential of buildings. Focused on a bazaar complex, an important example of modern architectural heritage, the present study contributes to the healthy transfer of the building to future generations and the improvement of its international recognition by investigating it in the context of convertibility. In this study, a mixed-mode research methodology including a two-stage approach was adopted. The first stage includes detailed qualitative interviews conducted with the architect and the administrative unit manager of the bazaar complex. The second stage consists of a survey conducted with a group of 45 experts, composed of scholars and professionals in Turkey. The results of the study suggest that it is necessary to develop IDB, especially in physical and technological terms and its function should be reconsidered. In particular, it was seen that economic issues constituted one of the major obstacles via-a-vis the continuity of use of large-scale buildings. Furthermore, it was realized that the artworks across the building group increased the importance of preserving the buildings and contributed to the possibility of their new functions being envisaged in the culture-art axis.
摘要:本研究的主要目的是探讨保护文化遗产建筑的适应性再利用的可能性。它的目标是将伊斯坦布尔德雷伯斯集市(IDB)作为具有类似特征和重要性的建筑的一个例子,并为应用AdaptSTAR方法的城市提供这些结构,该方法是为了评估建筑的转换潜力而开发的。本研究的重点是一个集市综合体,这是现代建筑遗产的一个重要例子,通过在可兑换性的背景下研究它,有助于将建筑健康地传递给后代,并提高其国际认可度。本研究采用混合模式研究方法,包括两阶段研究方法。第一阶段包括与建筑师和集市综合体的行政单位经理进行详细的定性访谈。第二阶段是对由土耳其学者和专业人员组成的45名专家小组进行调查。研究结果表明,有必要发展泛美开发银行,特别是在物理和技术方面,并应重新考虑其功能。特别是,人们认为经济问题是继续使用大型建筑物的主要障碍之一。此外,人们意识到,整个建筑群的艺术品增加了保护建筑物的重要性,并有助于在文化艺术轴中设想其新功能的可能性。
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引用次数: 0
Dent-to-Stiffener Evaluation Concept for Thin-Walled Steel Cylinders 薄壁钢瓶凹痕-加强评价概念
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-01 DOI: 10.2478/acee-2023-0032
Oğuzhan Akarsu, Barış Bayrak, Mahmut Kiliç, Mahyar Maali, Abdulkadir Cüneyt Aydin
Abstract Defects/imperfections can occur during manufacturing, assembly, welding, and other processes, which can reduce the critical buckling load. However, the axial buckling load is beyond the scope of this work, and there are many studies on the stiffening effect of longitudinal dents. This concept combined the idea of the dent-to-stiffener evaluation concept for thin-walled steel cylinders. This study aims to transform the dents into artificial dents for a stiffening effect on the buckling phenomena. For this purpose, 37 thin-walled steel cylinder models, including the perfect model, were designed for varying dent shapes, dent widths, dent depths, dent lengths, and dent angles. The study also contributed to the effect of dent parameters on the critical buckling load of thin-walled steel cylinders. In particular, increasing the initial buckling will motivate the industry to convert dents into stiffeners with small artificial touches to enhance the longevity of the structure. The results showed that the introduction of certain artificial dents can significantly increase the critical buckling load of cylinders, thus improving their resistance against buckling, which has significant implications for various industries that use thin-walled steel cylinders in their structures. The proposed simulations for transforming dents into artificial stiffeners can be a valuable tool for enhancing the longevity and safety of thin-walled steel cylinders and other structures.
缺陷/缺陷可以在制造、装配、焊接和其他过程中发生,可以降低临界屈曲载荷。然而,轴向屈曲载荷超出了本文的研究范围,对纵向凹痕的加筋效应研究较多。这一概念结合了薄壁钢瓶的凹痕-加劲评估概念。本研究旨在将凹痕转化为人工凹痕,对屈曲现象产生加劲作用。为此,设计了37个薄壁钢瓶模型,包括完美模型,用于不同的凹痕形状,凹痕宽度,凹痕深度,凹痕长度和凹痕角度。研究还揭示了凹痕参数对薄壁钢瓶临界屈曲载荷的影响。特别是,增加初始屈曲将促使行业将凹痕转化为加强筋,通过小的人工接触来延长结构的寿命。结果表明,引入一定的人工凹痕可以显著提高钢瓶的临界屈曲载荷,从而提高钢瓶的抗屈曲能力,这对在结构中使用薄壁钢瓶的各行业具有重要意义。所提出的将凹痕转化为人工加强筋的模拟可以为提高薄壁钢瓶和其他结构的寿命和安全性提供有价值的工具。
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引用次数: 0
Spatial Analysis of the Impact of Motor Vehicle Fires on the Urban Environment using the Example of Warsaw 机动车火灾对城市环境影响的空间分析——以华沙为例
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-01 DOI: 10.2478/acee-2023-0045
Krystian Szewczyński
Abstract This scientific article is dedicated to the analysis of the impact of vehicle fires on the urban environment. In the context of the dynamic processes of urbanization and societal mobilization, understanding the consequences of vehicle fires becomes exceedingly important for ensuring sustainable urban development and improving residents’ quality of life. The article presents the results of spatial analyses of vehicle fires that occurred within the Warsaw area between 2010 and 2021. In the analytical section, an attempt was made to identify the parts of the city where residents were most exposed to the emission of toxic substances. According to the presented calculations, almost 3 tons of toxic substances are released into the atmosphere every year as a result of vehicle fires in Warsaw. The article also provides information about the materials used in motor vehicles and assesses their environmental impact through the emission of hazardous substances in the event of a vehicle fire. Proposed changes that could minimize the number of vehicle fires in the future are also indicated in the article, thereby contributing to increased road safety levels in the city and positively influencing the environment.
这篇科学文章致力于分析车辆火灾对城市环境的影响。在城市化和社会动员的动态过程的背景下,了解车辆火灾的后果对于确保可持续城市发展和提高居民的生活质量变得极其重要。本文介绍了2010年至2021年华沙地区发生的车辆火灾的空间分析结果。在分析部分,试图确定城市居民最容易受到有毒物质排放的部分。根据所提出的计算,华沙每年有近3吨的有毒物质因车辆起火而释放到大气中。文章还提供了机动车所用材料的信息,并通过车辆火灾时排放的有害物质评估了它们对环境的影响。文章还指出了可以尽量减少未来车辆火灾数量的拟议变化,从而有助于提高城市的道路安全水平,并对环境产生积极影响。
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引用次数: 0
Experimental Tests of Laminated Glass with Embedded Steel Mesh Subjected to In-Plane Loading 嵌入钢网夹层玻璃的面内荷载试验研究
Q4 ENGINEERING, CIVIL Pub Date : 2023-09-01 DOI: 10.2478/acee-2023-0035
Marcin Kozłowski, Dominik Wasik
Abstract This article presents the issue of the in-plane post-breakage capacity of laminated glass elements. It presents the results of an ongoing research project that aims to develop novel reinforced, laminated glass elements with embedded steel woven mesh and increased post-breakage capacity. The research was focused on tensile strength tests in a custom-made experimental set-up. The tests were carried out on laminated glass samples consisting of two glass panes with 8, 10 and 12 mm thicknesses, bonded with an EVA Clear interlayer (3.04 mm thick). A total of 36 reference and reinforced samples were tested (6 series of 6 samples each). During the tests, an increase in load after glass breakage was observed for all samples, however, the samples reinforced with steel mesh showed much better strength in the post-breakage phase. It was found that the steel woven mesh embedded in laminated glass increases the post-breakage capacity by approximately 300% compared to the reference samples.
摘要本文提出了夹层玻璃构件的面内破碎后承载力问题。它展示了一项正在进行的研究项目的结果,该项目旨在开发新型的增强夹层玻璃元件,嵌入钢编织网,增加破碎后的能力。研究的重点是在定制的实验装置中进行拉伸强度测试。测试是在夹层玻璃样品上进行的,夹层玻璃样品由两片厚度分别为8,10和12 mm的玻璃板组成,并与EVA Clear夹层(3.04 mm厚)粘合。共检测参考和增强样品36个(6个系列,每个系列6个样品)。在试验过程中,所有样品在玻璃破碎后的荷载都有所增加,但在破碎后阶段,钢网加固的样品表现出更好的强度。研究发现,夹层玻璃中嵌入钢编织网后,其破碎后承载力比参考样品提高了约300%。
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引用次数: 0
The Impact of Polypropylene Fibre Addition on the CBR Value 聚丙烯纤维添加量对CBR值的影响
IF 0.5 Q4 ENGINEERING, CIVIL Pub Date : 2023-06-01 DOI: 10.2478/acee-2023-0017
Patryk Dobrzycki
Abstract The classic test for soil or aggregate bearing capacity in road construction is the CBR test. The results of the CBR were determined for gravelly sand and sand with the addition of 1.5% cement, as well as for their mixtures with 18 mm long polypropylene fibres in the amounts of 0.1%, 0.2% and 0.3%. The effect of compaction and time of curing of samples stabilised with hydraulic binder were also determined. The natural soil without cement and fibre additions had relatively high CBR values. The additions of 0.1% and 0.2% polypropylene fibres to the dry mass of the soil resulted in an approximately 2-fold increase in the CBR value for the samples compacted using the standard method. Increasing the amount of fibres to 0.3% caused a reduction in the CBR value to that obtained without fibre addition. For samples compacted using the modified Proctor method, the observations are different. Only the sample with 0.2% fibre addition achieved a slightly higher CBR value. Moreover, the addition of 1.5% cement and the length of treatment increased the CBR values.
摘要道路施工中土或骨料承载力的经典测试方法是CBR试验。CBR的结果被确定为砾石砂和沙子添加1.5%的水泥,以及18毫米长的聚丙烯纤维在0.1%,0.2%和0.3%的量的混合物。测定了液压粘结剂稳定试样的压实效果和固化时间。未添加水泥和纤维的天然土具有较高的CBR值。在土壤干质量中添加0.1%和0.2%聚丙烯纤维导致使用标准方法压实的样品的CBR值增加约2倍。当纤维添加量增加到0.3%时,CBR值比未添加纤维时降低。对于使用改进的Proctor方法压实的样品,观察结果是不同的。只有添加0.2%纤维的样品的CBR值略高。水泥掺入量为1.5%,处理时间延长,CBR值增加。
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引用次数: 0
Strength Reduction Method in the Stability Assessment of Vegetated Slopes 植被边坡稳定性评价中的强度折减法
IF 0.5 Q4 ENGINEERING, CIVIL Pub Date : 2023-06-01 DOI: 10.2478/acee-2023-0024
B. Świtała
Abstract The thoughtful design and mitigation of ecological slope stabilization measures rely heavily on the reliable assessment of the stability of vegetated slopes. This is a complex problem due to the many aspects of vegetation presence that must be taken into account. The numerical model should be able to consider mechanical root reinforcement and root water uptake, which can lead to soil desaturation. This paper presents the application of the strength reduction method to the Modified Cam-Clay model for unsaturated, root-reinforced soils, which allows for the quantitative estimation of slope stability. The technique is implemented in finite element software and tested using several numerical examples. Firstly, the sensitivity of the factor of safety to changes in root constitutive parameters is investigated. In the second example, the stability of the modelled slope is assessed under rainfall of a certain duration followed by progressively modifying soil strength parameters until failure occurs. Furthermore, slope stability is assessed for various durations of the rainfall period.
生态边坡稳定措施的合理设计和缓解在很大程度上依赖于植被边坡稳定性的可靠评估。这是一个复杂的问题,因为必须考虑到植被存在的许多方面。数值模型应考虑根系的机械加固和根系对水分的吸收,这可能导致土壤的去饱和。本文将强度折减法应用于非饱和根加筋土的修正Cam-Clay模型,使其能够定量估计边坡稳定性。该方法在有限元软件中实现,并通过几个数值算例进行了验证。首先,研究了安全系数对根本构参数变化的敏感性。在第二个例子中,模拟边坡在一定持续时间的降雨下的稳定性评估,然后逐步修改土壤强度参数,直到发生破坏。此外,还对不同降雨期的边坡稳定性进行了评估。
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引用次数: 0
Agriculture as a Catalyst for New Forms of Urban Habitat in Residential Architecture. A Case of Multi-Family and Mixed Housing Estates from 2010–2021 – European, American and Asian Context 农业作为住宅建筑中城市人居新形态的催化剂。2010-2021年欧洲、美洲及亚洲多户及混合屋苑个案
IF 0.5 Q4 ENGINEERING, CIVIL Pub Date : 2023-06-01 DOI: 10.2478/acee-2023-0013
Justyna Kleszcz
Abstract The article presented herein constitutes a research summary on urban, residential housing forms connected with agriculture developed in the years 2010–2021 throughout Northern America, Asia and Europe. The presented research was aimed at a comprehensive and comparative analysis of contemporary architecture, concerning new spatial phenomenon, analysing both the external form and the internal structure – formal and functional, of the resulting housing development. The method of global sampling was chosen as the possible examples of housing estates related to greenery or agriculture are spread worldwide. The paper aims to identify the main trends in creating a new form of urban living and to find the main points generating changes in the structure of buildings in connection with urban agriculture. Seven case studies were selected for the study, relating to both conceptual and already completed projects, showing a number of differences between the theoretical approach and its implementation, both in terms of the adopted assumptions and parameters of the obtained space in relation to housing estates combining architecture and greenery from that period. Case studies from Asia, North America and Europe created a background for comparison with the first Polish example of this type of development, located in Poznań.
本文对2010-2021年北美、亚洲和欧洲与农业相关的城市住宅形式进行了研究总结。所提出的研究旨在对当代建筑进行全面和比较分析,涉及新的空间现象,分析由此产生的住房发展的外部形式和内部结构-形式和功能。选择全球抽样的方法是因为与绿化或农业有关的住宅小区可能在世界范围内传播。本文旨在确定创造一种新的城市生活形式的主要趋势,并找到与都市农业相关的建筑结构变化的主要原因。该研究选择了七个案例研究,涉及概念和已经完成的项目,显示了理论方法与其实施之间的一些差异,无论是在采用的假设方面,还是在与当时的建筑和绿化相结合的住宅小区有关的获得空间的参数方面。来自亚洲、北美和欧洲的案例研究创造了一个背景,以便与位于波兹纳斯的波兰第一个此类发展的例子进行比较。
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引用次数: 0
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Architecture Civil Engineering Environment
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