Jappelt U.,WTM Engineers |
Harte R.,University of Wuppertal
Bautechnik | Year: 2012
In the last two decades, the sector of wind energy plants has grown rapidly and therefore enabled also a dynamic development of relevant technologies. Initiated by revision of the Renewable Energy Law as well as by the expiration of the approved life of first generation plants, the replacement of ancient wind energy plants has gained increasing significance. Increasing rotor diameters and tower heights lead additionally to new demands on structural engineers, checking engineers and supervisors. In the attached text recommendations of the Bau-Überwachungsverein BÜV regarding site supervision and periodic inspections of onshore wind energy plants are presented. Copyright © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.
Morgen K.,WTM Engineers
Beton- und Stahlbetonbau | Year: 2012
The construction stage CT 3a of Bremerhaven's container terminal, one of Europe's largest container handling facilities, was a jointless quay structure 340 m in length which started operation in early 2003 and was extended by a further 1, 680 m of jointless quay structure in construction stage CT 4. On the basis of positive experiences from this project, the quay structure for the new deep-water port at Wilhelmshavenmeasuring 1, 720 m in length and constructed between 2009 and 2011 - was also designed and built as a jointless structure. This article features information on concrete technology, structural detailing, crack width control, and on-site implementation. Copyright © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.
Morgen K.,WTM Engineers
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2011
Some of the basic principles of jointless design of engineering concrete structures are discussed and some built examples are presented. Mixes with low heat release and reduced shrinkage coefficients must be developed for concrete technology in a seamless construction. Excessive concrete strengths should be avoided, and the mix design must be adjusted to changing seasonal conditions. The concrete must be carefully placed and appropriately treated after pouring and suitable precautions should be taken to prevent excessive drying and cooling. The adiabatic temperature of the concrete over time must be determined for the crack width verification, using large test cubes. It is also very important to develop an appropriate structural design, particularly in fault zones and end sections. Built examples including a building, a quay wall structure, and a lock demonstrate that the seamless method can be successfully implemented in building practice.
Morgen K.,WTM Engineers |
Steffens A.,WTM Engineers
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2012
The option of applying Eurocode 2 (EC2) was granted subject to certain conditions in the August 2010 communication sent by the structural engineering expert committee. The EC2 pilot project was one of the major contributions to achieving this situation where twelve engineering firms tested the EC2 with National Annex (EC2+NA) in the period from 2007 to 2010, supported by ten software providers. Each engineering firm performed a structural analysis on the basis of EC2+NA for a project previously built according to the specifications provided in DIN 1045-1. The results were recorded in a comprehensive final report and published in a series of articles. This research project was initiated by engineers working in the industry and funded by Argebau, the DIBt, and several associations. It provided a professional contribution to standardization made by engineers with hands-on experience for the first time.
Morgen K.,WTM Engineers
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2010
The implementation of the Eurocodes in German standards is a difficult project that requires a major effort, which is why new, professional approaches to the drafting of standards are needed. European standards are either initiated by a national standardization organization, or their preparation is assigned by the European Commission to make EU Directives more specific by way of a standardization mandate. One of the standards committees at Deutsches Institut für Normung (DIN) has decided to actively contribute to a European or international standardization project. Upon the initiative of the Verband der Beratenden Ingenieure and the Bundesvereinigung der Pruflngenieure für Bautechnik, the funding of the research project on the 'Development of a Guideline to Prepare User-Friendly Design Standards Suitable for Practical Use' was granted. This project is to define the requirements to be met by a standard to ensure safe construction according to the state of the art whilst retaining its user friendliness and suitability for practical application.