Journal articles
Author(s) | Title | Journal | Issue | Page | Category |
---|---|---|---|---|---|
Wechsel im A/U/F-Vorsitz | Bauphysik | 6/1997 | 192 | Persönliches | |
Wechsel der Obmannschaft | Bautechnik | 2/1998 | 130-131 | Nachrichten | |
Wechsel an der VDEW-Spitze | Bauphysik | 2/1998 | 68 | Persönliches | |
Wechsel am Steuer des Stahlbau Zentrums Schweiz | Stahlbau | 10/2003 | 754 | Verbände | |
Hauschild, Carola; Jäger, Wolfram | Webinar "Anwendung von DIN EN 1996" | Mauerwerk | 5/2014 | 323-326 | Berichte |
Steau, Edward; Keerthan, Poologanathan; Mahendran, Mahen | Web crippling capacities of rivet fastened rectangular hollow flange channel beams under one flange load cases | Steel Construction | 3/2016 | 222-239 | Articles |
AbstractA new rivet fastened rectangular hollow flange channel beam (RHFCB) was proposed using an intermittently rivet fastening process as an alternative to welded beams. The rivet fastened RHFCB allows greater section optimisation and flexibility in designing suitable combinations of web and flange widths and thicknesses for many industrial applications. In the industrial applications of rivet fastened RHFCBs as flooring, roofing or modular building systems, their flanges will be fastened to supports, which will provide increased capacities. However no research has been conducted to investigate the web crippling capacities of RHFCBs with flanges unfastened and fastened to supports under one-flange load cases. Similarly the applicability of current design rules for cold-formed steel sections are not suitable for rivet fastened RHFCBs. Hence to address these issues, an experimental study was conducted to investigate the web crippling behaviour and capacities of RHFCBs based on the new AISI S909 standard test method. This study included rivet fastened RHFCBs with flanges unfastened and fastened to supports under End One Flange (EOF) and Interior One Flange (IOF) load cases. Tests with flanges fastened to supports showed that web crippling capacities increased by 39 and 5 % for EOF and IOF load cases. Comparisons of experimental web crippling capacity results with predictions using the current AS/NZS 4600 and AISI S100 design standards showed that web crippling design equations are conservative for rivet fastened RHFCBs with flanges unfastened and fastened to supports under EOF and IOF load cases. Hence new equations are proposed to determine the web crippling capacities of rivet fastened RHFCBs. This paper presents the details of this web crippling experimental study of rivet fastened RHFCB sections and the results. x | |||||
Dauner, H.-G.; Decorges, G.; Stucki, D. | Web buckling strength for the launching of a box girder with a 130 m main span (Stegbeulen beim Einschub eines Kastenträgers über eine Spannweite von 130 m) | Stahlbau | 10/2000 | 775-780 | Fachthemen |
AbstractDie aktuellen Normen beinhalten noch keine Angaben zu Problemen der konzentrierten Lasteinleitung in Kastenträger mit Längssteifen und abgestuften Stegblechdicken. Es fehlen unseres Wissens hierfür noch wissenschaftlich abgesicherte Erkenntnisse. Solche Lösungen, wie die z. B. beim "Viaduc des Vaux" (Schweiz, A1) für den Brückeneinschub gewählt wurden, können bei hohen Trägern durchaus wirtschaftlich und herstellungstechnisch begründet sein. Es werden vorhandene Lösungsansätze für nicht abgestufte Stegbleche ohne Längssteifen verglichen und ein Lösungsweg beschrieben, der sowohl die Längssteife als auch die Blechdickenstufung berücksichtigt. x | |||||
de Deus Nascimento, Sérgio Marcelo; Pedro, José J. Oliveira; da Graça, André Filipe Biscaya Semedo Pereira | Web buckling of high-strength steel plate girders induced by bending curvature - Professor Eduardo de Arantes e Oliveira Award at XII Conference on Steel and Composite Construction in Coimbra 2019 | Steel Construction | 2/2020 | 84-91 | Articles |
AbstractThe simplified formula for the web slenderness limit given in EN 1993-1-5 to prevent flange-induced buckling does not usually govern the web design other than for very slender class 4 plate girder webs in steel grades S235 to S355. However, the same formula applied to plate girders designed in S690 high-strength steel (HSS) gives lower slenderness limits likely to govern web design and restrains the possibilities for reducing their thickness in order to profit from the high steel resistance. This paper reviews the background to the simplified formula currently used and compares the web slenderness limits obtained with numerical results from a full non-linear analysis of slender high-strength steel girders. x | |||||
González, Claudia; Arroyo, Marcos; Gens, Antonio | Wear and abrasivity: observations from EPB drives in mixed soft - rock sections | Geomechanics and Tunnelling | 3/2015 | 258-264 | Topics |
AbstractThis paper summarizes the main observations related to geotechnical properties and tool changes that characterize the different tunnel drives in a database of 33 km of EPB tunnel records from the Barcelona area. The data have been examined in detail with regard to cutting tool replacement and performance of the mechanized excavation. The database includes tunnels in soft soils, in hard and medium rocks and in mixed soil-rock conditions; tool changing records and geotechnical properties. Transverse and longitudinal geotechnical heterogeneity are accounted for systematically. Longitudinal heterogeneity is used to subdivide the drives in the database into homogeneous units. Transverse (within section) heterogeneity is described by a set of newly developed impact factors FI. x | |||||
Weald & Downland Museum, West Sussex, Großbritannien | Bautechnik | 9/2002 | 619 | BAUTECHNIK aktuell | |
WDVS-Planungsatlas erweitert | Bauphysik | 5/2018 | 357 | Aktuell | |
Fülle, Claudia; Leopold, Nadine | WDVS im Holzbau - Optimierter Nachweis des dauerhaften Witterungsschutzes durch Kombination von Messungen im Wandprüfstand und hygrothermischen Simulationen | Bauphysik | 3/2016 | 135-146 | Fachthemen |
AbstractWärmedämm-Verbundsysteme (WDVS) für die Anwendung auf Außenwänden im Holzbau werden national durch allgemeine bauaufsichtliche Zulassungen geregelt. Im Zuge der Zulassungserteilung muss der dauerhaft wirksame Witterungsschutz der Holzkonstruktion durch das WDVS nachgewiesen werden. Dies kann im Wandprüfstand durch die Messung von Holzfeuchten sowie Temperaturen und rel. Luftfeuchten in verschiedenen Bereichen der Konstruktion bei hygrothermischer Belastung nach ETAG 004 erfolgen. Hersteller von WDVS sind bestrebt, den Zeit- und Kostenaufwand für solche Prüfungen zu optimieren, indem aus der Vielzahl der zur Verfügung stehenden Putze und Dämmstoffe nur die ungünstigsten Kombinationen geprüft werden. Die Entscheidung über die ungünstigste Variante wird meistens anhand einzelner Kriterien, wie Wasserdampfdurchlässigkeit des Putzes, getroffen. Die hygrothermischen Simulationen haben jedoch gezeigt, dass bei Einbeziehung verschiedener Randbedingungen die ungünstigste Variante nicht immer erwartungsgemäß ausfällt. Der Beitrag zeigt beispielhaft, wie und unter welchen Voraussetzungen Simulationsberechnungen zu einer sicheren Einschätzung des hygrothermischen Verhaltens der verschiedenen Varianten einer Wandkonstruktion führen. x | |||||
Fülle, Claudia; Leopold, Nadine | WDVS im Holzbau - Optimierter Nachweis des dauerhaften Witterungsschutzes durch Kombination von Messungen im Wandprüfstand und hygrothermischen Simulationen | Bauphysik | 3/2016 | 135-146 | Fachthemen |
AbstractWärmedämm-Verbundsysteme (WDVS) für die Anwendung auf Außenwänden im Holzbau werden national durch allgemeine bauaufsichtliche Zulassungen geregelt. Im Zuge der Zulassungserteilung muss der dauerhaft wirksame Witterungsschutz der Holzkonstruktion durch das WDVS nachgewiesen werden. Dies kann im Wandprüfstand durch die Messung von Holzfeuchten sowie Temperaturen und rel. Luftfeuchten in verschiedenen Bereichen der Konstruktion bei hygrothermischer Belastung nach ETAG 004 erfolgen. Hersteller von WDVS sind bestrebt, den Zeit- und Kostenaufwand für solche Prüfungen zu optimieren, indem aus der Vielzahl der zur Verfügung stehenden Putze und Dämmstoffe nur die ungünstigsten Kombinationen geprüft werden. Die Entscheidung über die ungünstigste Variante wird meistens anhand einzelner Kriterien, wie Wasserdampfdurchlässigkeit des Putzes, getroffen. Die hygrothermischen Simulationen haben jedoch gezeigt, dass bei Einbeziehung verschiedener Randbedingungen die ungünstigste Variante nicht immer erwartungsgemäß ausfällt. Der Beitrag zeigt beispielhaft, wie und unter welchen Voraussetzungen Simulationsberechnungen zu einer sicheren Einschätzung des hygrothermischen Verhaltens der verschiedenen Varianten einer Wandkonstruktion führen. x | |||||
Savidis, Stavros; Bergmann, Mathias; Schepers, Winfried; Fontara, Ioanna-Kleoniki | Wave propagation in inhomogeneous media via FE/PML method | geotechnik | 2/2022 | 98-107 | Aufsätze |
AbstractThe Perfectly Matched Layer (PML) method is an efficient approach to imposing radiation conditions at the bounded region of interest in case of wave propagation in unbounded domains. This paper presents and validates 3D FE/PML numerical schemes based on two different PML formulations for homogeneous and inhomogeneous geological media exhibiting discrete or continuous inhomogeneity. In the equation of motion for the PML domain the applied stretching behavior is expressed either as complex material properties or as complex coordinates. Both PML formulations are implemented in the FEM and verified against analytical solutions. Three different types of material inhomogeneity are considered: layered half-space, continuously inhomogeneous half-space with linear velocity profile and continuously inhomogeneous half-space with nonlinear velocity profile. Sensitivity analyses are conducted, and the performance of the developed numerical schemes is investigated taking into account a broad variation of the PML parameters. Recommendations are given for the optimal values of the PML parameters for the case of homogeneous and inhomogeneous geological media. x | |||||
Seidel, Marc | Wave induced fatigue loads - Insights from frequency domain calculations | Stahlbau | 8/2014 | 535-541 | Fachthemen |
AbstractOffshore wind turbines are subject to dynamic excitation from wave loads. Especially when monopile substructures are used, significant fatigue loads can be induced by waves, which are then governing the design. Calculations in the frequency domain are very efficient to compute such wave induced loads and by applying some simplifications, very compact equations can be derived for the determination of fatigue loads. Such simplified formulas can be applied with good accuracy and important insight on governing parameters for wave induced fatigue loads can be gained. Based upon the formulas, further methods e. g. for lumping of scatter diagrams and for interpolations of fatigue loads for different positions within a wind farm can be derived. x | |||||
WAVE 2000 Wave Propagation - Moving Loads - Vibration Reduction | Bautechnik | 12/1999 | 1139 | Termine | |
WAVE 2000 | Bautechnik | 8/2000 | 604 | Termine | |
Ring, Benno; Gollegger, Johannes | Watertight segmental lining at drained cross passages under high water gradients | Geomechanics and Tunnelling | 1/2019 | 45-52 | Topics |
AbstractThe Follo Line tunnels consist of a watertight single shell segmental lining with gaskets. The cross passages are drained, but watertightness is required between the two structures, which is a challenging boundary condition for design and construction. This paper focuses on the structural design of the intersection between the tunnels and the cross passages, which is performed with considerable effort. Special attention is brought to the water pressures acting in this area. Some of the challenges during project execution are discussed as well. x | |||||
WaterfrontExpo 2004 | Bautechnik | 8/2004 | 676 | Termine | |
WaterfrontExpo 2004 | Bautechnik | 3/2004 | 220 | Termine | |
Yuan, Yong; Chi, Yang | Water permeability of concrete under uniaxial tension | Structural Concrete | 2/2014 | 191-201 | Technical Papers |
AbstractConcrete structures can suffer from water permeating under stresses. This paper investigates the surface water permeability of reinforced concrete elements subjected to uniaxial tension. A testing system was developed to combine a conventional loading machine with a surface permeameter. To eliminate the effect of initial absorption of water, calibration tests were conducted on plain concrete samples with different surface saturated states. The experiment presented is designed to test the surface water permeability of a structural member under uniaxial tension. Specimens were reinforced centrally with different sizes of steel bar and fabricated with normal-strength and high-strength concrete. A uniaxial tensile load was applied from 0.10 to 0.80 of estimated ultimate cracking load in 0.10 increments. At the same time, water permeability was measured at each load step. Test results give the relationship between water permeability of concrete member and tensile load levels. x | |||||
Hahn, Simon; Polat, Berker; Jamali, Shahin; Wittig, Volker; Bracke, Rolf | Water jet drilling technology for application in geothermal environments / Erschließung geothermischer Lagerstätten mittels Hochdruck-Wasserstrahl Bohrtechnik | Geomechanics and Tunnelling | 1/2022 | 74-81 | Topics |
AbstractHigh-pressure water jet drilling technologies are widely used in the drilling industry. Especially in geothermal and hard rock applications, jet drilling is, however, confronted with several limitations like lateral length, hole size, steerability and jetability of the reservoir rock. The application of jet drilling technologies in the field can only be estimated based on the experience of the operator and surface experiments imitating downhole conditions. To predict a successful jetting operation in the field, a modelling framework has been developed, which considers operational and technical parameters as well as reservoir rock specifications. The framework consists of calibrated models describing downhole hydraulics and mechanics during the jetting operation and estimates the required technical equipment to successfully penetrate the reservoir rock and the maximum achievable lateral length for various hole configurations. The modelling framework is applied on a theoretical case study. x | |||||
Water Jet Applications in Construction Engineering (A. W. Momber (Hrsg.)) | Beton- und Stahlbetonbau | 5/1999 | 236 | Bücher | |
Danzer, Mathilde | Waste law framework for the recovery of material excavated from tunnels / Abfallrechtliche Rahmenbedingungen für die Verwertung von Tunnelausbruchmaterial | Geomechanics and Tunnelling | 5/2014 | 411-418 | Topics |
AbstractThis paper has been conceived for the future “Leaflet for the reuse of the material excavated in tunnelling”. The goal was to explain the term “waste” in contrast to non-waste (product), the requirements for dealing with wastes, the permissible recovery of wastes and the time when the end-of-waste starts. Apart from the passages of legal texts which are most important from the technical point of view, explanations, legal material and letters already written by the Federal Ministry of Agriculture, Forestry, Environment and Water Management on this issue have been used. Moreover the decisive provisions of the Landfill Ordinance 2008 and of the Law on the Remediation of Contaminated Sites are presented. x | |||||
Wasserwirtschaftliches Kolloquium: Informationsverarbeitung und Simulation im Küsteningenieurwesen und Wasserbau | Bautechnik | 1/1999 | 98 | Termine | |