Civil Engineering Design最新文献_第5页

Lifetime predictions of prestressed concrete bridges—Evaluating parameters of relevance using Sobol' indices 预应力混凝土桥梁寿命预测——使用Sobol指数评估相关参数

Civil Engineering Design Pub Date : 2021-09-27 DOI: 10.1002/cend.202100009

David Sanio, Mark Alexander Ahrens, Peter Mark

{"title":"Lifetime predictions of prestressed concrete bridges—Evaluating parameters of relevance using Sobol' indices","authors":"David Sanio, Mark Alexander Ahrens, Peter Mark","doi":"10.1002/cend.202100009","DOIUrl":"10.1002/cend.202100009","url":null,"abstract":"The residual structural lifetime of concrete bridges is often limited by fatigue of the prestressing steel. In practice, numerical calculations of the structure are combined with Miner's rule—based on load frequencies and stress amplitudes—to estimate the damage. Thereby, various parameters must be accounted for whereof a few are actually relevant. Structural monitoring is valuable to increase the accuracy of lifetime predictions, but usually experts choose the right parameters on experience only. A more objective assessment can be reached by sensitivity analysis. A powerful method is provided by Sobol's variance-based indices. They quantify the influence of a single parameter's variance on the model's total variance and account for interactions in nonlinear models, too. Exemplified on a reference structure, sensitivity indices are determined. Meanwhile specific characteristics like the nonlinear behavior of concrete after cracking are considered. In this case, the key elements of lifetime prediction turn out to be the time-dependent losses of prestress and the traffic loads.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"4 5-6","pages":"143-153"},"PeriodicalIF":0.0,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cend.202100009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77775886","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: 1

Heating rate with regard to temperature release of UHPC under cyclic compressive loading 循环压缩加载下UHPC温度释放的升温速率

Civil Engineering Design Pub Date : 2021-08-27 DOI: 10.1002/cend.202100020

M. Deutscher, S. Scheerer

引用次数: 1

Investigating the feasibility of using carbon fiber tapes as reinforcement for 3D concrete printing 研究碳纤维带作为混凝土3D打印增强材料的可行性

Civil Engineering Design Pub Date : 2021-08-05 DOI: 10.1002/cend.202100024

Martin Scheurer, Philipp Quenzel, Peter Nölke, Jonas Reuter‐Schniete, T. Gries

引用次数: 3

Integrative computational design and construction: Rethinking architecture digitally 综合计算设计与建造:对建筑的数字化反思

Civil Engineering Design Pub Date : 2021-06-22 DOI: 10.1002/CEND.202100027

J. Knippers, Cordula Kropp, A. Menges, O. Sawodny, D. Weiskopf

{"title":"Integrative computational design and construction: Rethinking architecture digitally","authors":"J. Knippers, Cordula Kropp, A. Menges, O. Sawodny, D. Weiskopf","doi":"10.1002/CEND.202100027","DOIUrl":"https://doi.org/10.1002/CEND.202100027","url":null,"abstract":"Increasing the construction capacity, while at the same time significantly reducing harmful emissions and consumption of nonrenewable resources, and still providing a liveable and affordable built environment, provides a great challenge for future construction. In order to achieve this, both the productivity of construction processes and the energy and resource efficiency of construction systems have to be improved in a reciprocal process. Digital technologies make it possible to address these challenges in novel ways. The vision of this Cluster of Excellence IntCDC at the University of Stuttgart and the Max Planck Institute for Intelligent Systems is to harness the full potential of digital technologies to rethink design and construction based on integration and interdisciplinarity, with the goal of laying the methodological foundations to profoundly modernize the design and construction process and related building systems by adopting a systematic, holistic and integrative computational approach. One key objective is to develop an overarching methodology of “ co-designing ” methods, processes and systems based on interdisciplinary research encompassing architecture, structural engineering, building physics, engineering geodesy, manufacturing and systems engineering, computer science and robotics, and humanities and social sciences. In this way, the Cluster aims to address the ecological, economic and social challenges and to provide the prerequisites for a high-quality and sustainable built environment and a digital building culture. for building in the future is to build more, while emitting fewer pollutants and using fewer nonrenewable resources, and still create a high-quality and liveable built environment. In a mutually influencing process, both the productivity of the building process and the energy and resource efficiency of the building systems must be improved. Digital technologies offer new approaches to solving these challenges. The and","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78420601","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: 24

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