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30‐MN‐testing machine for quasi‐static and cyclic compression and tension tests Worldwide there is an increasing trend towards ever higher stressed and larger dimensioned structures. Furthermore, high‐performance materials such as ultra‐high performance concretes or high‐strength steels are increasingly being used. In order to comply with this development regarding research and testing of components (columns, cables etc.) with large (almost) real‐scale dimensions and the associated very large testing loads, the iBMB, Division of Concrete Construction of the TU Braunschweig and the Civil Engineering Materials Testing Institute Braunschweig (MPA) designed, constructed and finally realized a 30‐MN‐testing machine for quasi‐static and cyclic compression and tension tests. This article describes the 30‐MN‐testing machine with its key figures and functional principle as well as its successful use in several research, testing and calibration tasks. 相似文献
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Dr. Erin Koos M.Sc. Jens Dittmann Prof. Dr. rer. nat. Norbert Willenbacher 《化学，工程师，技术》2011,83(8):1305-1309
It has been found that in suspensions capillary forces play an essential role between the disperse phase and the continuous phase in respect of their rheological behavior. In this review it is shown, that the rheological behavior of a disperse phase, which is dispersed in a continuous phase, can be changed significantly by adding a small amount (< 1 %) of a secondary liquid that is not mixable with the bulk phase. This effect now can be used to modify product properties specifically. 相似文献
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Konrad Bergmeister Prof. Dr.Dr. Dipl.‐Ing. Walter Weis Dipl.‐Ing. Josef Taferner Dipl.‐Ing. Dr. Philipp Sicher Dipl.‐Ing. 《Beton- und Stahlbetonbau》2009,104(6):322-329
Internal unbounded Posttensioning in Wide Span Slabs for Building Constructions In order to comply with the needs of robustness and economy to be considered in design and construction, the internal, unbounded posttensioning has been optimized, in a way to install the cables with the minimum necessary amount of work. For this purpose a free system of posttensioning cables has been adopted, in which border uplift forces (in correspondence of the supports) and single or multiple midspan uplift forces are necessary. The deviation forces helps to limit the deflections and cracks. In this paper after some theoretical reflections two innovative practical applications are presented. On the basis of the mechanics of the load bearing behaviour and with three dimensional finite element calculations also the soil‐structure interaction have been taken into account. 相似文献
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