Civil Engineering Design最新文献_第6页

Collaborative research on carbon reinforced concrete structures in the CRC/TRR 280 project CRC/TRR 280项目碳增强混凝土结构协同研究

Civil Engineering Design Pub Date : 2021-06-11 DOI: 10.1002/cend.202100017

Birgit Beckmann, Jan Bielak, Sven Bosbach, Silke Scheerer, Christopher Schmidt, Josef Hegger, Manfred Curbach

{"title":"Collaborative research on carbon reinforced concrete structures in the CRC/TRR 280 project","authors":"Birgit Beckmann, Jan Bielak, Sven Bosbach, Silke Scheerer, Christopher Schmidt, Josef Hegger, Manfred Curbach","doi":"10.1002/cend.202100017","DOIUrl":"https://doi.org/10.1002/cend.202100017","url":null,"abstract":"New materials allow new building designs and construction types. However, initial construction projects using the new materials show that traditional construction principles - in the case of carbon reinforced concrete those derived from steel reinforced concrete - are still being used. In other words, conventional materials are merely substituted. Only combined with intelligent construction strategies it is possible to exploit the full potential of innovative materials. Detached from established patterns of thought, the fundamentals for a new way of building with concrete are to be created in the frame of the Collaborative Research Centre Transregio (CRC/TRR) 280 project “Design Strategies for Material-Minimised Carbon Reinforced Concrete Structures–Principles of a New Approach to Construction” at Technische Universität Dresden (TUD) and RWTH Aachen University. These are to be based on profound insights into the mechanical behavior of novel mineral structures. Innovative lightweight construction strategies and material composites reduce resource and energy consumption while maintaining high levels of usability, structural safety, and durability, while the aspirational esthetics make a valuable contribution to the culture of building. The long-term research alliance of TUD and RWTH pools the excellent competencies, inspiring research into material-minimized construction with mineral composites. The article highlights the research activities planned for the first period from July 2020 to June 2024.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"3 3","pages":"99-109"},"PeriodicalIF":0.0,"publicationDate":"2021-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cend.202100017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137670803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Industrializing precast productions 预制件产业化

Civil Engineering Design Pub Date : 2021-06-06 DOI: 10.1002/cend.202100019

Peter Mark, Gisela Lanza, Daniel Lordick, Albert Albers, Markus König, Andre Borrmann, Lothar Stempniewski, Patrick Forman, Alex Maximilian Frey, Robert Renz, Agemar Manny, Jan Stindt

{"title":"Industrializing precast productions","authors":"Peter Mark, Gisela Lanza, Daniel Lordick, Albert Albers, Markus König, Andre Borrmann, Lothar Stempniewski, Patrick Forman, Alex Maximilian Frey, Robert Renz, Agemar Manny, Jan Stindt","doi":"10.1002/cend.202100019","DOIUrl":"10.1002/cend.202100019","url":null,"abstract":"Building in heavy rain is seldom beneficial, but common practice on site. It promotes inaccuracies and impairs the use of modern but sensible high-performance materials and costs time, since disruption in construction frequently causes complicated returns to the planning process. Nevertheless, a handcrafted production process is still considered the one and only alternative since all buildings are unique and thus must be manually constructed on site. Indeed? The priority program entitled “Adaptive modularized constructions made in a flux” funded by the German Research Foundation follows a completely new approach. Buildings are divided into similar modular precast concrete elements, prefabricated in flow production, quality-assured, and just-in-time assembled on site. Comparable to puzzles with many pieces, the uniqueness of the structure is maintained. The motto is: “Individuality on a large scale-similarity on a small scale”. The contribution presents approaches of modularization, production concepts, and linking digital models. Serial, stationary prefabrication enables short production times and resource-efficient modules that are assembled to load-bearing structures with low geometrical deviations. Stringent digitalization ensures high quality of all intermediate steps. These comprise fabrication, assembly, and the whole service life of the structure. The result is a lean production process.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"3 3","pages":"87-98"},"PeriodicalIF":0.0,"publicationDate":"2021-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cend.202100019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88036775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Ground motions induced by wind turbines 风力涡轮机引起的地面运动

Civil Engineering Design Pub Date : 2021-05-18 DOI: 10.1002/cend.202100015

Sven Nagel, Toni Zieger, Birger Luhmann, Peter Knödel, Joachim Ritter, Thomas Ummenhofer

{"title":"Ground motions induced by wind turbines","authors":"Sven Nagel, Toni Zieger, Birger Luhmann, Peter Knödel, Joachim Ritter, Thomas Ummenhofer","doi":"10.1002/cend.202100015","DOIUrl":"10.1002/cend.202100015","url":null,"abstract":"Wind flow transfers forces to the wind turbine's rotor blades. These then set the rotor in motion. The hub and the gearbox, where present, transfer this rotational energy to the generator for conversion into electrical power. All the rotating components have significant mass and are located at the head of a slender, elastic load-bearing tower in which they induce dynamic effects. The resulting vibrations, generated at the upper end of the tower, are modified by the dynamic properties of the tower structure and pass through the foundations into the ground. Broadband seismometers record these ground vibrations not only directly adjacent to the wind turbine but also at greater distances of (up to) several kilometers from the turbine. We are aware that local residents and opponents of wind power consider that these vibration phenomena bear potential negative health effects. In the context of this paper, seismic vibrations were measured at the foundation of a 2 MW reference turbine. These seismic signals were compared to numerical simulations. Based on this, we explain the physical background. In the past, any ground vibrations measured have usually been attributed exclusively to the excitation frequencies from the rotor. However, the investigations presented here show that the structural properties of the tower structure significantly influence the type and intensity of the vibrations induced in the ground and dominate the ground motion amplitudes. Finally, we show that the targeted use of absorbers can significantly reduce the vibrations induced in the ground.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"3 3","pages":"73-86"},"PeriodicalIF":0.0,"publicationDate":"2021-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cend.202100015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81985068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Calculation of maximum crack width for practical design of reinforced concrete 钢筋混凝土实际设计中最大裂缝宽度的计算

Civil Engineering Design Pub Date : 2021-04-18 DOI: 10.1002/cend.202100004

Dirk Schlicke, Eva Maria Dorfmann, Ekkehard Fehling, Nguyen Viet Tue

{"title":"Calculation of maximum crack width for practical design of reinforced concrete","authors":"Dirk Schlicke, Eva Maria Dorfmann, Ekkehard Fehling, Nguyen Viet Tue","doi":"10.1002/cend.202100004","DOIUrl":"10.1002/cend.202100004","url":null,"abstract":"Cracks are an essential characteristic of reinforced concrete (RC) construction. Serviceability and durability, however, require a reasonable limitation of the maximum crack width. The prediction of the maximum crack width of RC, however, is not trivial and has been much debated over the past decades. This article starts with a fundamental comparison of basic procedures for determining the crack width, namely using a mechanical or calibrated model. Following, the behavior of reinforced concrete during crack formation is thoroughly discussed with a focus on the bond stress-slip relation at the reinforcement-concrete interface and with regard to the particular crack stage. Based on these fundamentals, a mechanical calculation model is then proposed for practical calculation of maximum crack width in RC members. The suitability of the proposed model is demonstrated by the comparison of predicted and experimentally obtained maximum crack widths for a database including 460 crack width measurements. It is shown that the current state of knowledge enables a mechanically plausible calculation of the maximum crack width. Although the formulation based on the bond law is not trivial, the calculation model can be prepared with appropriate simplifications in a practical way.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"3 3","pages":"45-61"},"PeriodicalIF":0.0,"publicationDate":"2021-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cend.202100004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74728462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Gypsum plasterboards under natural fire—Experimental investigations of thermal properties 天然火灾作用下的石膏板热性能试验研究

Civil Engineering Design Pub Date : 2021-04-18 DOI: 10.1002/cend.202100002

Jochen Zehfuß, Lisa Sander

{"title":"Gypsum plasterboards under natural fire—Experimental investigations of thermal properties","authors":"Jochen Zehfuß, Lisa Sander","doi":"10.1002/cend.202100002","DOIUrl":"10.1002/cend.202100002","url":null,"abstract":"The use of fire protection materials is a common approach to ensure the fire resistance of steel elements exposed to fire. In this article, experimental investigations regarding the thermal behavior of gypsum plasterboards for steel elements exposed to natural fires are presented. Material properties, such as the specific heat, the thermal conductivity, and the density of gypsum plasterboards, have been investigated yet, but not especially for natural fire scenarios with different heating rates and cooling phases. For this purpose, experimental investigations of gypsum plasterboards under natural fire exposure are presented. Based on our own experimental investigations, the thermal properties of the investigated gypsum plasterboard for both the heating and cooling phases are demonstrated. Additionally, results from a large-scale fire test on loaded steel beams as well as unloaded steel columns protected with gypsum plasterboards are presented. The test results show a clear dependency on the heating and cooling rate. Furthermore, the thermal material properties change within the heating and cooling phase. So, the main objective of this article is to provide the thermal properties of selected gypsum plasterboard exposed to natural fires in the heating and cooling phases.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"3 3","pages":"62-72"},"PeriodicalIF":0.0,"publicationDate":"2021-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cend.202100002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79992067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Thin glass in façades: Adhesive joints for thin glass composite panels with 3D printed polymer cores 面板上的薄玻璃:带有3D打印聚合物芯的薄玻璃复合板的粘合接头

Civil Engineering Design Pub Date : 2021-03-18 DOI: 10.1002/cend.202100010

Christiane Kothe, Anna Bodenko, Felix Nicklisch, Christian Louter

引用次数: 4

Innovative methods to test and monitor the preload in mechanical fasteners 机械紧固件预紧力测试与监测的创新方法

Civil Engineering Design Pub Date : 2021-03-12 DOI: 10.1002/cend.202100008

Michael Reiterer

引用次数: 2

Glass-rigid foam composite for innovative concrete sandwich elements 玻璃刚性泡沫复合材料的创新混凝土夹层元素

Civil Engineering Design Pub Date : 2021-03-08 DOI: 10.1002/cend.202000010

Thorsten Weimar, Christian Hammer, Torsten Leutbecher, Kevin Metje

{"title":"Glass-rigid foam composite for innovative concrete sandwich elements","authors":"Thorsten Weimar, Christian Hammer, Torsten Leutbecher, Kevin Metje","doi":"10.1002/cend.202000010","DOIUrl":"10.1002/cend.202000010","url":null,"abstract":"In building envelopes, sandwich elements with facings made of glass currently require either adhesives or mechanical connectors. The avoidance of any connectors seems to be favorable in terms of resource and energy savings both in production and in building envelopes. The present studies are part of the development of a glass-rigid foam-concrete sandwich element without additional adhesives and mechanical connectors. This paper reports on the structural bond behavior between polyurethane rigid foam and float glass with different surfaces with or without applying a bonding agent. Tensile bond and shear tests show, that a sandblasted toughened glass surface results in cohesive failure of the insulation layer. The two production-related surfaces of float glass are defined as atmosphere and tin side. Both surfaces offer an adhesive failure between the insulation layer and glass. Test specimens of glass and insulation layer without bonding agent show no significant differences between the atmosphere and the tin side. Overall, the test specimens with bonding agents achieve higher levels of adhesive tensile bond and shear strength. Light and electron microscopic studies of fractured surfaces show, that the bonding agent has a significant influence on the wetting and pore formation of the liquid polyurethane.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"3 1-2","pages":"3-12"},"PeriodicalIF":0.0,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cend.202000010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89228541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Resource-saving in buildings through material substitution: A preliminary study of structural dependencies 通过材料替代的建筑资源节约:结构依赖关系的初步研究

Civil Engineering Design Pub Date : 2021-02-12 DOI: 10.1002/cend.202000023

Regine Ortlepp

{"title":"Resource-saving in buildings through material substitution: A preliminary study of structural dependencies","authors":"Regine Ortlepp","doi":"10.1002/cend.202000023","DOIUrl":"10.1002/cend.202000023","url":null,"abstract":"Around the world, building stocks are the dominant consumers of mineral resources. Mining activities for the supply of construction materials can lead to conflicts in land use. In order to minimize such sources of conflict, we need improved knowledge of material consumption in the built environment. For this, we can make use of material flow analysis (MFA), which in turn requires the determination of material composition indicators (MCIs). Usually, such indicators are defined for a building type. Currently, there is a lack of research on the impact of material substitution on these MCIs as well as studies on the potential for resource-saving that take technical issues into account. This contribution describes a preliminary study on material substitution in six different reference buildings which compare the bill of materials for structures constructed using standard clay bricks vs potential material substitutes such as hollow, lightweight, or autoclaved aerated concrete blocks. The results show that considerable reductions in material consumption can thereby be achieved for certain parts of the considered buildings. In the future, these effects should be incorporated in the MCIs as key variables for an MFA.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"3 1-2","pages":"13-22"},"PeriodicalIF":0.0,"publicationDate":"2021-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cend.202000023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77265567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aiming for life cycle sustainability assessment of cement-based composites: A trend study for wall systems of carbon concrete: Dresden Nexus Conference 2020—Session 4—Circular economy for building with secondary construction materials to minimise resource use and land use 针对水泥基复合材料的生命周期可持续性评估:碳混凝土墙体系统的趋势研究:德累斯顿Nexus会议2020 -会议4 -循环经济建筑与二次建筑材料，以尽量减少资源使用和土地使用

Civil Engineering Design Pub Date : 2020-11-27 DOI: 10.1002/cend.202000024

Christoph Scope, Edeltraud Guenther, Julia Schütz, Torsten Mielecke, Eric Mündecke, Konstantin Schultze, Peter Saling

{"title":"Aiming for life cycle sustainability assessment of cement-based composites: A trend study for wall systems of carbon concrete: Dresden Nexus Conference 2020—Session 4—Circular economy for building with secondary construction materials to minimise resource use and land use","authors":"Christoph Scope, Edeltraud Guenther, Julia Schütz, Torsten Mielecke, Eric Mündecke, Konstantin Schultze, Peter Saling","doi":"10.1002/cend.202000024","DOIUrl":"10.1002/cend.202000024","url":null,"abstract":"The narrative sustainable building is core message of European politics. Strategies discussed in this regard concern above all material minimization by using new more efficient manufacturing technologies, new form finding approaches for load-bearing structures or new high-performance materials. The goal of the research project V2.10, funded by the German Federal Ministry of Education and Research, refers to the latter by assessing the sustainability potential of building components made of innovative textile reinforced concrete. We conceptualized a life cycle sustainability assessment framework and applied it to variants of sandwich wall systems made of carbon concrete composites and steel-reinforced concrete. Results indicate hotspots in technology and material choices that could be addressed by circular strategies, for example, refuse, reduce or recycling. Overall, one design variant made of carbon concrete composites is the best performing with respect to all dimensions of sustainability.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"2 5-6","pages":"143-158"},"PeriodicalIF":0.0,"publicationDate":"2020-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cend.202000024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"104770347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15