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Titelbild: Beton- und Stahlbetonbau 5/2025 混凝土和钢筋混凝土建筑5/2025

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-05-21 DOI: 10.1002/best.202580511

{"title":"Titelbild: Beton- und Stahlbetonbau 5/2025","authors":"","doi":"10.1002/best.202580511","DOIUrl":"https://doi.org/10.1002/best.202580511","url":null,"abstract":"Röntgen – seit über einhundert Jahren in der Medizin etabliert, hält die Methode in der Bauwerksdiagnostik erst heute Einzug in Form digitaler Radiographie. Sie bietet einmalige Vorteile gegenüber allen anderen zerstörungsfreien Methoden. Die direkte Bildgebung als Schwarz-Weiß-Foto aus dem Bauteilinnern ermöglicht die Identifikation von Einbauteilen, Bewehrung sowie Mängeln und Schäden mit sonst unerreichbarer Aussagesicherheit. Alles, was auf einem Röntgenbild identifiziert werden kann, kann außerdem millimetergenau vermessen werden. Somit können korrosionsbedingte Querschnittverluste an Bewehrung, Verpresszustände von Hüllrohren und ganze Bauteilquerschnitte sichtbar gemacht und für Qualitätssicherung, statische Nachrechnung oder eine zielführende Instandsetzungsplanung rekonstruiert werden. Der Beitrag auf Seite 378-387 erläutert anhand verschiedener Beispiele aus der Praxis, welche Möglichkeiten die Radiographie im Bauwesen bietet und wo die Anwendungsgrenzen liegen. Das Titelbild zeigt den Einsatz an einer Spannbetonbrücke mit dünnwandigen Fertigteilträgern und ein Röntgenbild mit drei Spanngliedern. (Bild: Bauray GmbH)","PeriodicalId":55386,"journal":{"name":"Beton- und Stahlbetonbau","volume":"120 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/best.202580511","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Beton- und Stahlbetonbau aktuell Beton- und Stahlbetonbau 5/2025 混凝土和钢结构混凝土和钢结构

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-05-21 DOI: 10.1002/best.202580581

引用次数: 0

Einfluss der Oberfläche und Festigkeit auf das Spannungsrisskorrosionsverhalten von Spannstählen 应力和强度对应力腐蚀的影响

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-05-12 DOI: 10.1002/best.202500009

Stefan Rappl M.Sc., Nico Maczionsek M.Sc., PD Dr.-Ing. habil. Kai Osterminski, Dipl.-Ing. Falk Meyer, Prof. Dr.-Ing. Michael Pohl

{"title":"Einfluss der Oberfläche und Festigkeit auf das Spannungsrisskorrosionsverhalten von Spannstählen","authors":"Stefan Rappl M.Sc., Nico Maczionsek M.Sc., PD Dr.-Ing. habil. Kai Osterminski, Dipl.-Ing. Falk Meyer, Prof. Dr.-Ing. Michael Pohl","doi":"10.1002/best.202500009","DOIUrl":"https://doi.org/10.1002/best.202500009","url":null,"abstract":"The role of surface condition and strength in stress corrosion cracking of prestressing steelNumerous bridges in Germany are currently classified as “in need of reservation”. In these structures, not only reinforcing steel but also prestressing steel is used as reinforcement. The latter is particularly susceptible to stress corrosion cracking, a brittle material failure triggered by the ingress of hydrogen. To investigate the influencing factors, constant load tests (CLTs) were carried out on three different prestressing steel grades and examined using state of the art methods. The test program was divided into component testing, testing on prestressing steels as received, and material testing, testing on machined and polished test specimens made from prestressing steels. This procedure was used to identify the influence of the surface against stress corrosion cracking. Furthermore, it was found that higher strengths resulted in a decrease in service life. Treatment of the surface by polishing had a positive effect on the service life of the test, particularly in the case of low strength classes. By reducing the load by 10 %, a median increase in duration of 126 % was achieved at the same strength class. In notch stress analyses using finite element modeling on digital twins of prestressing steel, the influence of the surface condition was highlighted. Hydrogen analyses conducted following the constant load test showed an increase in diffusible hydrogen content with rising material strength in both component and material testing.","PeriodicalId":55386,"journal":{"name":"Beton- und Stahlbetonbau","volume":"120 6","pages":"446-456"},"PeriodicalIF":1.0,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144315268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

WH-Überseequartier in Hamburg – Tragwerke der 14 Hochbauten 汉堡的WH- Uberseequartier - 14座建筑的结构

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-05-07 DOI: 10.1002/best.202500024

Dr.-Ing. Thomas Schadow, Dipl.-Ing. Nicodemus Jansson

{"title":"WH-Überseequartier in Hamburg – Tragwerke der 14 Hochbauten","authors":"Dr.-Ing. Thomas Schadow, Dipl.-Ing. Nicodemus Jansson","doi":"10.1002/best.202500024","DOIUrl":"https://doi.org/10.1002/best.202500024","url":null,"abstract":"WH-Überseequartier in Hamburg – structures of the 14 buildingsThe new center of the HafenCity district, located directly by the river Elbe: WH-Überseequartier in Hamburg, was opened in April 2025. Unibail-Rodamco-Westfield is the company behind the project as investor, developer and operator of the new district, which has a total gross floor area of 419.000 square meters and consists of 14 buildings based on designs from numerous renowned architectural firms. This paper describes the buildings as well as the structural challenges of the various load-bearing structures of the buildings and basements in relation to the different usage requirements, showcased from the perspective of planning and construction execution. The already published first part about the WH-Überseequartier describes the challenges of planning and implementing the various civil engineering structures required in the district, from the construction pits in combination with the subway station located in the middle of the con-struction site to the necessary partial replacement of the quay construction walls at Chicagokai and the foundations of the buildings and landscape architecture.","PeriodicalId":55386,"journal":{"name":"Beton- und Stahlbetonbau","volume":"120 7","pages":"537-545"},"PeriodicalIF":1.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerische Untersuchungen zur Rissentwicklung in Vorsatzschalen bei massiven Wasserbauwerken 大型水务工程中水井开裂的数值研究

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-05-07 DOI: 10.1002/best.202500017

Dipl.-Ing. Eva Maria Dorfmann, Prof. Dr.-Ing. habil. Nguyen Viet Tue, Prof. Dr. techn. Dirk Schlicke

{"title":"Numerische Untersuchungen zur Rissentwicklung in Vorsatzschalen bei massiven Wasserbauwerken","authors":"Dipl.-Ing. Eva Maria Dorfmann, Prof. Dr.-Ing. habil. Nguyen Viet Tue, Prof. Dr. techn. Dirk Schlicke","doi":"10.1002/best.202500017","DOIUrl":"https://doi.org/10.1002/best.202500017","url":null,"abstract":"Numerical investigations of the crack development in concrete facings for massive hydraulic structuresThe repair of existing structures is becoming increasingly important worldwide. This trend also affects the need for renovating massive hydraulic structures. A large share of these restorations involves repairing damaged concrete surfaces. A common approach in these cases is the installation of a reinforced concrete facing. However, the installation of the reinforcement required to limit the crack width in the facing layer is both time-consuming and, consequently, costly. The required reinforcement essentially depends on the development of the hydration heat and the resulting restrained deformations at an early age. This article presents a numerical model to simulate the interaction between the concrete facing and the existing structure, analyzing the stress development during concrete hardening and the subsequent crack formation. A realistic representation of the structural behavior requires the use of suitable models to simulate time-dependent properties such as temperature evolution, strength and stiffness development of the concrete, as well as its time-dependent deformation behavior (creep and shrinkage). The simulation results show that an optimization of the reinforcement for crack width control is possible.","PeriodicalId":55386,"journal":{"name":"Beton- und Stahlbetonbau","volume":"120 7","pages":"494-503"},"PeriodicalIF":1.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Finite-Elemente-Analyse von dünnen gebetteten Platten mit lokaler Lasteinleitung 具有局部负载引导的薄层板的有限元分析

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-05-02 DOI: 10.1002/best.202500013

Dipl.-Ing. Yolcu Sever, Prof. Dr. techn. Dirk Schlicke

{"title":"Finite-Elemente-Analyse von dünnen gebetteten Platten mit lokaler Lasteinleitung","authors":"Dipl.-Ing. Yolcu Sever, Prof. Dr. techn. Dirk Schlicke","doi":"10.1002/best.202500013","DOIUrl":"https://doi.org/10.1002/best.202500013","url":null,"abstract":"Modeling of local load applications in embedded slabs using finite element methodIn modern design practice, the structural analysis and design of ground-supported slabs is carried out using finite element software. Careful use of these calculation tools is essential, especially for thin slabs with high localized loads, such as those found in industrial floors or container terminal floors with individual loads from high racks or containers, as well as wheel loads from forklifts. For an accurate analysis, the element size (mesh refinement) of the finite element model must be carefully chosen in addition to an appropriate representation of the soil. These parameters significantly influence the resulting internal forces and thus the design. In this work, a sensitivity analysis is performed to investigate different modeling approaches (plate or solid elements) and mesh sizes. The aim is to analyze the effects of load smearing and load distribution in discretized finite element models for supported slabs. The results show that the mesh dependence is significant, especially for high local loads. Depending on the element type and mesh fineness, there is also a clear difference whether the analysis is based on nodal or element mean values. Finally, practical recommendations for modeling and analysis are given to enable more accurate and efficient design.","PeriodicalId":55386,"journal":{"name":"Beton- und Stahlbetonbau","volume":"120 6","pages":"426-433"},"PeriodicalIF":1.0,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Entlüftungs- und Verdichtungsverhalten von Frischbeton 新鲜水果的营养和营养特性

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-05-02 DOI: 10.1002/best.202500006

Bastian Strybny M.Sc., Dr.-Ing. Tobias Schack, Dr.-Ing. Julian Link, Macielle Deiters M.Sc., Prof. Dr.-Ing. Michael Haist

{"title":"Entlüftungs- und Verdichtungsverhalten von Frischbeton","authors":"Bastian Strybny M.Sc., Dr.-Ing. Tobias Schack, Dr.-Ing. Julian Link, Macielle Deiters M.Sc., Prof. Dr.-Ing. Michael Haist","doi":"10.1002/best.202500006","DOIUrl":"https://doi.org/10.1002/best.202500006","url":null,"abstract":"De-airing and compaction behaviour of fresh concrete – fundamental mechanisms and building component propertiesThe compaction behaviour of fresh concrete is a decisive characteristic in the production of high-performance and durable concrete components. It affects not only the mechanical properties and durability of the finished component, but also its aesthetics. Until now, however, the compaction behaviour can only be described indirectly by defining a consistency class of the fresh concrete, assuming that the compaction behaviour improves with increasing consistency. This approach, however, is impeded by the use of innovative concretes with reduced water content, as such concrete may have significantly altered rheological properties, which greatly affect the ability of air bubbles to rise in the fresh concrete. The objective of this paper was therefore to present new investigations on the fundamental mechanisms of air bubble rise in cement paste and mortar. This is followed by large-scale component tests in which the influence of compaction frequency and compaction time on surface porosity, compressive strength and microstructure porosity in hardened concrete were investigated. By linking the investigations of the basic mechanisms of air bubble rise with the transferability of the results to large-scale practical construction tests for concrete compaction, new insights into proper concrete de-airing can be demonstrated.","PeriodicalId":55386,"journal":{"name":"Beton- und Stahlbetonbau","volume":"120 6","pages":"434-445"},"PeriodicalIF":1.0,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vorschau: Beton- und Stahlbetonbau 5/2025 混凝土和钢筋混凝土工程5/2025

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-04-08 DOI: 10.1002/best.202580499

引用次数: 0

Inhalt: Beton- und Stahlbetonbau 4/2025 内容：混凝土和钢筋混凝土结构4/2025

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-04-08 DOI: 10.1002/best.202580411

引用次数: 0

Veranstaltungen: Beton- und Stahlbetonbau 4/2025 混凝土和钢筋混凝土建筑4/2025

IF 1 4区工程技术

Beton- und Stahlbetonbau Pub Date : 2025-04-08 DOI: 10.1002/best.202580479

引用次数: 0