Civil Engineering Design最新文献_第5页

Potentials of hydroactive lightweight façades for urban climate resilience 水活性轻质建筑对城市气候适应能力的潜力

Civil Engineering Design Pub Date : 2022-03-29 DOI: 10.1002/cend.202200003

Christina Eisenbarth, Walter Haase, Lucio Blandini, Werner Sobek

{"title":"Potentials of hydroactive lightweight façades for urban climate resilience","authors":"Christina Eisenbarth, Walter Haase, Lucio Blandini, Werner Sobek","doi":"10.1002/cend.202200003","DOIUrl":"10.1002/cend.202200003","url":null,"abstract":"Extreme heat and heavy rainfall events with severe inundations have a significant impact on urban architecture, resulting in considerable personal injuries and material damage. Nowadays, the proportion of façade surface in urban areas with tall buildings is substantially larger than the proportion of horizontal roof or ground surface areas. A high leverage effect on climate resilience and sustainability of buildings and cities can therefore be attributed to the building envelopes. Whereas the majority of existing façades are designed to provide only minor qualities at a district or urban level, research at the Institute for Lightweight Structures and Conceptual Design (ILEK) at the University of Stuttgart focuses on development of a new type of hydroactive lightweight façades incorporating climate change mitigation and adaptation strategies. A textile- and film-based façade element called HydroSKIN is capable of providing a retention surface on the envelope of the building. With a minimal amount of embedded mass, energy, and CO2 emissions, the façade add-on element is suitable for both new and existing buildings. HydroSKIN combines rainwater harvesting (RWH) and run-off water reduction by retaining the precipitation water that strikes the façade with a time-delayed evaporative cooling (EC) of the building and its environment.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"4 1-3","pages":"14-24"},"PeriodicalIF":0.0,"publicationDate":"2022-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cend.202200003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74931216","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: 6

Structural monitoring of segmental tunnel linings: Toward safer and more resource-efficient tunnels 管片隧道衬砌结构监测:迈向更安全、更节约资源的隧道

Civil Engineering Design Pub Date : 2022-03-26 DOI: 10.1002/cend.202100053

Fabian Rauch, Oliver Fischer

{"title":"Structural monitoring of segmental tunnel linings: Toward safer and more resource-efficient tunnels","authors":"Fabian Rauch, Oliver Fischer","doi":"10.1002/cend.202100053","DOIUrl":"10.1002/cend.202100053","url":null,"abstract":"Shield-driven tunnels play a key role in an efficient and clean future mobility. In order to ensure their reliable operation and to allow further innovations, it is necessary to know their level of safety from a structural point of view. Only if the internal forces within the tunnel linings are known precisely, a realistic estimation of the load-bearing capacity is possible. However, this is easier said than done, as the prediction of internal forces is subjected to major uncertainties. In case of shield-driven tunnels in particular, there is still a great need for research on the prediction of internal forces. Therefore, in a current research project the authors are performing an in-situ structural monitoring on segmental tunnel linings in Frankfurt (Main) to observe the development of the internal forces. A sophisticated monitoring concept, as well as an extensive calibration and validation program, ensures reliable results. This article presents the current status of the project including the general concepts, theoretical aspects, calibration tests in the tunnel segment testing rig as well as first in situ measurement data.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"4 1-3","pages":"62-71"},"PeriodicalIF":0.0,"publicationDate":"2022-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cend.202100053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86632282","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: 2

Hybrid slim floor structures for a more sustainable future 混合薄地板结构，更可持续的未来

Civil Engineering Design Pub Date : 2022-03-26 DOI: 10.1002/cend.202100054

Marvin Vollbracht

引用次数: 0

Investigation of industrial robots vs joinery machines for milling pockets in glulam: Comparison based on surface quality and 3D scans 工业机器人与细木工机在胶合木中铣袋的研究:基于表面质量和3D扫描的比较

Civil Engineering Design Pub Date : 2022-03-26 DOI: 10.1002/cend.202100049

Marc Pantscharowitsch, Benjamin Kromoser

引用次数: 2

Curved beams with circular cross-sections under pure in-plane bending 纯面内弯曲下具有圆形截面的弯曲梁

Civil Engineering Design Pub Date : 2022-03-24 DOI: 10.1002/cend.202100036

Dimitrios S. Sophianopoulos, George T. Michaltsos

引用次数: 0

Multi-scale composite finite element modeling of three-dimensional prestressed reinforced concrete structural members: Part I—A comprehensive framework 三维预应力钢筋混凝土结构构件的多尺度复合有限元建模:第一部分-综合框架

Civil Engineering Design Pub Date : 2022-03-21 DOI: 10.1002/cend.202100042

Guillermo Díaz

{"title":"Multi-scale composite finite element modeling of three-dimensional prestressed reinforced concrete structural members: Part I—A comprehensive framework","authors":"Guillermo Díaz","doi":"10.1002/cend.202100042","DOIUrl":"10.1002/cend.202100042","url":null,"abstract":"The goal of this work is to develop a complete theoretical framework for the numerical modeling of three-dimensional prestressed reinforced concrete structural members, soil mixture, and their interactions. This numerical formulation is based on the construction of a new composite finite element, in order to tackle the multi-scale problem. For this purpose, the mechanical behavior of each microstructure component material will be modeled as follows: (a) for the plain concrete (PC) and the soil mixture, an anisotropic-damage-elastoplastic model equipped with the strong discontinuity approach will be taken into account; (b) a polycrystal plasticity model, for the steel rebars and prestrssed tendons will be captured through a new strategy solution of discontinuous bifurcation problem, with the main objective to represent the multi-cracking phenomenon; (c) regarding the mechanical behavior of the aggregates and rocks (skeleton—hydro mechanic problem) in the PC and soil mixture, respectively, an anisotropic-damage-double-poro-polycrystal plasticity model equipped with softening material will be considered. An advanced failure algorithm based on the marching tetrahedron and the pseudo-termic problem will be developed. Finally, the zone that characterizes the interaction between the structural member and the soil mixture will be encrusted inside the composite finite element.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"4 1-3","pages":"43-61"},"PeriodicalIF":0.0,"publicationDate":"2022-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86340428","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

Investigation of a large-scale adaptive concrete beam with integrated fluidic actuators 集成流体作动器的大型自适应混凝土梁研究

Civil Engineering Design Pub Date : 2022-03-19 DOI: 10.1002/cend.202100037

Timon Burghardt, Christian Kelleter, Matthias Bosch, Markus Nitzlader, Matthias Bachmann, Hansgeorg Binz, Lucio Blandini, Werner Sobek

{"title":"Investigation of a large-scale adaptive concrete beam with integrated fluidic actuators","authors":"Timon Burghardt, Christian Kelleter, Matthias Bosch, Markus Nitzlader, Matthias Bachmann, Hansgeorg Binz, Lucio Blandini, Werner Sobek","doi":"10.1002/cend.202100037","DOIUrl":"10.1002/cend.202100037","url":null,"abstract":"As the world population keeps growing, so does the demand for new construction. Considering material resources are limited, it will be unfeasible to meet such demand employing conventional construction methods. A new resource-saving approach is provided by adaptive structures. Using sensors, actuators and control units, structures are enabled to adapt to loads, for example, to compensate for deformations. Since deformations are dominant in the design of bending-stressed load-bearing structures, adaptivity enables such structures to be realized using less material and achieving the same load-bearing capacity in comparison to conventional designs. This article presents a concrete beam of typical building dimensions that compensates deflections by means of integrated fluidic actuators. These actuators offer the possibility of reacting optimally to general loading. The investigation is carried out on an approximately 4-m-long beam with integrated hydraulic actuators. To ensure the overall functionality, accurate dimensioning of the beam as well as the hydraulic system is mandatory. Analytical design of the beam and actuation system are carried out for predimensioning. Experimental testing validates the function and demonstrates that the adaptive beam works as predicted. A fully compensation in deflection is possible. Therefore, a significant increase in load-bearing capacity is possible with the same material input compared to conventional beams.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"4 1-3","pages":"35-42"},"PeriodicalIF":0.0,"publicationDate":"2022-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cend.202100037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86036095","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: 7

Threaded rods grouted in beech laminated veneer lumber 螺纹杆灌浆在山毛榉层压单板木材

Civil Engineering Design Pub Date : 2022-03-10 DOI: 10.1002/cend.202100041

Jonas Wirries, Franck Y. T. Tsopjio, Till Vallée, Sebastian Myslicki

{"title":"Threaded rods grouted in beech laminated veneer lumber","authors":"Jonas Wirries, Franck Y. T. Tsopjio, Till Vallée, Sebastian Myslicki","doi":"10.1002/cend.202100041","DOIUrl":"10.1002/cend.202100041","url":null,"abstract":"Glued-in rods are a class of adhesively bonded joints for timber engineering applications resulting in high-strength and stiffness connections. However, the use of polymeric adhesives may lead to issues related if the temperatures exceed their glass transition temperature, restricting their performance under quasi-static, or more critically, sustained loads. To overcome these, the substitution of polymeric adhesives by mineral high-performance grout was investigated. It was found that primers have neither a significant effect on strength nor on the failure mode; threated wood surfaces, however, resulted in a significant improvement of the latter. Based thereupon, grouted-in rods were manufactured. The best performance was achieved with a threaded wood surface, which achieved roughly 50% of the strength comparable adhesively bonded glued-in rod's strength. While the obtained strength may seem quite low, it is important to remind that the latter will largely remain unaffected by temperature; accordingly, made at room temperature, the comparison between grouted and glued rods is in favor of adhesive bonding, it may well be different at elevated ones.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"4 4","pages":"110-119"},"PeriodicalIF":0.0,"publicationDate":"2022-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88414946","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

Volumetric intersections: Modularization approaches for freeform prefab concrete construction 体积交叉点:自由形式预制混凝土结构的模块化方法

Civil Engineering Design Pub Date : 2022-03-03 DOI: 10.1002/cend.202100047

David Stieler, Tobias Schwinn, Achim Menges

引用次数: 1

Monitoring the microstructural deterioration of concrete exposed to leaching in purified water 纯净水浸出混凝土微观结构劣化的监测

Civil Engineering Design Pub Date : 2021-12-15 DOI: 10.1002/cend.202100051

Robert Schulte Holthausen, Melanie Merkel, Wolfgang Breit, Michael Raupach

{"title":"Monitoring the microstructural deterioration of concrete exposed to leaching in purified water","authors":"Robert Schulte Holthausen, Melanie Merkel, Wolfgang Breit, Michael Raupach","doi":"10.1002/cend.202100051","DOIUrl":"10.1002/cend.202100051","url":null,"abstract":"Concrete is considered to be durable in permanent contact with water, making it a preferred material for the construction of drinking water reservoirs. More severe conditions, however, such as contact with purified water lead to the leaching of calcium and the deterioration of concrete surfaces. Due to the diffusive nature, deterioration begins superficially and ingresses with time. Consequently, concrete surfaces are severely damaged and the rebar-protective alkalinity can be lost. In this study, results from long-term laboratory leaching experiments in purified water of differently prepared concrete surfaces relevant for drinking water reservoirs are reported. Samples are monitored by both conventional laboratory techniques and, for the first time, by single-sided 1H nuclear magnetic resonance to gain knowledge on appearance and performance as well as the microstructural changes with sub-millimeter depth resolution. Results give a deepened insight into the time- and depth-depending material changes. Concrete with a lower w/c ratio, more durable cement, or a densified surface shows a slowed deterioration. The progressing leaching deterioration is described using a combined diffusion-erosion model that allows a more direct comparison of results to other exposures.","PeriodicalId":100248,"journal":{"name":"Civil Engineering Design","volume":"4 4","pages":"99-109"},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85873302","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: 2