Key Engineering Materials最新文献_第10页

Optimization of Reinforced Concrete Structures in Terms of Environmental Impacts, Durability and Cost 从环境影响、耐久性和成本角度优化钢筋混凝土结构

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/p-kv2eck

Anna Horáková, A. Kohoutková, I. Broukalová

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Limits for the Punching Shear Capacity of the Flat Slabs Reinforced with Transverse Reinforcement 用横向钢筋加固的平板的冲剪承载力限值

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/p-2yaeaj

Natália Gregušová, J. Halvonik

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Experimental Study of Cast in Anchors Embedded in UHPFRC 嵌入超高分子量泡沫塑料混凝土中的浇注锚栓的实验研究

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/p-r6h4w7

Jan Prchal, L. Vráblík

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Production of Steel-Concrete Composite UHPFRC Elements for Experimental Tests of the Blast Resistance 生产用于抗爆性实验测试的钢-混凝土复合超高强度混凝土结构件

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/p-oyi5pk

Adam Citek, M. Kryštov, Karel Hurtig, Vojtech Sulc, M. Foglar, D. Čítek

{"title":"Production of Steel-Concrete Composite UHPFRC Elements for Experimental Tests of the Blast Resistance","authors":"Adam Citek, M. Kryštov, Karel Hurtig, Vojtech Sulc, M. Foglar, D. Čítek","doi":"10.4028/p-oyi5pk","DOIUrl":"https://doi.org/10.4028/p-oyi5pk","url":null,"abstract":"The resistance of structures to the effects of explosions is very current issue in these days. During explosion structures are subjected to extreme dynamic local loads and it is necessary to the structure and its reinforcement for this type of loading. In UHPFRC the reinforcement is evenly distributed throughout the structure in the form of dispersed steel fibres. Based on the knowledges of excellent mechanical properties of both steel and UHPFRC, there is an assumption that an appropriate combination of these materials in the sense of composite constructions should result in significantly less damage to the structure in the case of explosion. The paper is focused on the process of production of testing specimens intended for blast resistance tests. The first part of the paper describes tests elements and goals of the experiment. In the next part of the paper the design and material properties of the used concrete mixtures are described. Then production in the sense of formwork preparation and casting is described. At the end of the article, there is a brief comparison of the results achieved for specimens from UHPFRC and reference NSC.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"43 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140234348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigations on Blast Performance of Steel-Concrete Composite Structures 钢-混凝土复合结构的爆破性能研究

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/p-4zmz3d

Vojtech Sulc, M. Foglar, R. Hájek, J. Kolísko, Adam Citek, Karel Hurtig

{"title":"Investigations on Blast Performance of Steel-Concrete Composite Structures","authors":"Vojtech Sulc, M. Foglar, R. Hájek, J. Kolísko, Adam Citek, Karel Hurtig","doi":"10.4028/p-4zmz3d","DOIUrl":"https://doi.org/10.4028/p-4zmz3d","url":null,"abstract":"Blast performance of concrete and ultra-high performance fiber concrete (UHPFRC) has been subject to numerous publications in the past decades. The enhanced force-deflection diagram of fiber concrete and ultra-high performance fiber concrete provide massive increase on the protective function of these materials compared to regular concrete. Nevertheless, concrete spalling cannot be fully avoided even when using UHPFRC. The next step for harmful debris ejection prevention can be supplementing the concrete specimens with steel slabs. The steel slab will not just hold the debris, but can, if properly bonded with concrete, contribute to the load bearing capacity as steel-concrete composite structure. This paper presents an overview of recent experiments on blast resistance of steel-concrete composite slabs. In total 6 pairs of specimens (dimension 1.000/1.000/150mm) were prepared, 6 specimens using regular concrete and 6 specimens using UHPFRC. One pair of specimens was reinforced by a steel mesh at 30mm cover from the soffit, one pair was supplemented by a steel plate bonded with 4 studs in the corners, at the complementary specimen pair, the concrete was also covered with a steel plate at the side subjected to blast loading, in the case of the further pair of specimens, the steel plates were connected by steel bars arranged in a mesh 150/150mm. The final 2 pairs represented steel-concrete composite slabs, in the first case, the shear studs were supplemented with a steel mesh (according to provisions of the European standard for steel-concrete composite structures), in the last case, the shear studs were replaced by a shear plate. All specimens were subjected to the same contact blast loading. The paper presents the experimental arrangement, the achieved results and a brief discussion on the structural behavior.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"222 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140233612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theory of the Second Order for Braced and Bracing Columns 支撑柱和支撑柱的二阶理论

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/p-etak9w

L. Fillo, V. Benko

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Temperature Measurement in Massive Concrete Structures 大体积混凝土结构的温度测量

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/p-b0ztq2

Vit Nemcic, Jan L. Vítek, Jiří Lukeš

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Concrete Structures and Structural Elements in Modern Construction 现代建筑中的混凝土结构和结构构件

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/b-txs3pt

Šárka Nenadálová, Petra Johová, Kateřina Hamplová

引用次数: 0

Aspects Affecting the Quality of Masonry Buildings and Innovations in Masonry 影响砌体建筑质量的因素和砌体技术创新

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/p-zun5wb

Kristýna Richterová, Pavel Heinrich, Jan Harš, Petr Bíly

{"title":"Aspects Affecting the Quality of Masonry Buildings and Innovations in Masonry","authors":"Kristýna Richterová, Pavel Heinrich, Jan Harš, Petr Bíly","doi":"10.4028/p-zun5wb","DOIUrl":"https://doi.org/10.4028/p-zun5wb","url":null,"abstract":"The construction industry is undergoing another revolution, including the field of masonry construction. New materials and products for masonry are constantly being developed and construction details and implementation procedures are being resolved. Digitization and the introduction of automation in the masonry process (in prefabrication halls or on-site robotic bricklaying) are also an integral part of the development of the masonry construction industry. The topic of the following paper is a summary of problematic construction details of masonry buildings, i.e., the solution of the plinth console, the solution of the building opening, the bearing of lintels on the masonry and the bearing of the ceiling structure on the masonry wall. The results of laboratory tests are presented – the load-bearing capacity of the jamb of the building opening (accessory bricks / cut bricks in the jamb) and the load-bearing capacity of the lintel placed on the accessory edge brick. Furthermore, the paper deals with the construction of masonry buildings in the 21st century, including the first results of a compressive load test on masonry walls made of precast small-format units. The conclusion of the paper points out the importance of correct design details of masonry buildings before their application (programming) in software controlling the automated masonry process.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"335 2‐3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140232841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dependence of a Steel-concrete-Steel Sandwich Structure Behavior under Pure In-Plane Shear Loading on the Reinforcement Ratio 钢-混凝土-钢夹层结构在纯平面剪力荷载下的行为与配筋率的关系

Key Engineering Materials Pub Date : 2024-03-18 DOI: 10.4028/p-egknc1

Roman Kubát, Petr Bíly

{"title":"Dependence of a Steel-concrete-Steel Sandwich Structure Behavior under Pure In-Plane Shear Loading on the Reinforcement Ratio","authors":"Roman Kubát, Petr Bíly","doi":"10.4028/p-egknc1","DOIUrl":"https://doi.org/10.4028/p-egknc1","url":null,"abstract":"This paper deals with failure modes of a steel-concrete-steel sandwich loaded by pure in-plane shear. Current research together with the developed models imply that increase of reinforcement ratio leads to decrease of ductility and possibly to change a failure mode from yielding of steel in tension to crushing of concrete in compression which results in brittle failure. In order to give a reader basic information about in-plane shear behavior of a steel-concrete-steel sandwich, an analytical model is introduced. Japanese experimental program that researched a behavior of SCS panels with reinforcement ratio 2.3%, 3.2% and 4.5% is also shown. In addition to the effect of changing the reinforcement ratio, the experimental program also investigated the effect of the transverse steel plate on the ductility of test panels with a degree of reinforcement of 3.2%. The next chapter describes the methodology used by the author to model the individual parts of the model, the loads, and especially the method of supporting the model. This is followed by the presentation of the results of the analysis on the calibration and extrapolation models. Finally, a discussion is conducted on the agreement of the analysis results on the calibration models with the Japanese experimental results, followed by an evaluation of the analysis results on the extrapolation models. According to the results on the extrapolation models the critical degree of reinforcement at which a change in the failure mode of the structure occurs under in-plane shear loading is around 13%.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"32 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140231746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0