Congresos. Editorial UPV
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Congresos realizados en la UPV publicados por la Editorial Universitat Politècnica de València.
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Browsing Congresos. Editorial UPV by Sponsor "Allianz Industrie Forschung, Alemania"
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- PublicationExperimental investigations on the load bearing behaviour of an innovative prestressed composite floor system in fire(Editorial Universitat Politècnica de València, 2018-06-05) Schaumann, Peter; Meyer, Patrick; Mensinger, Martin; Koh, Suet Kwan; Allianz Industrie Forschung, Alemania; Bundesministerium für Wirtschaft und Energie, Alemania[EN] In Germany, regulations for hollow spaces in slab systems require 30 minutes standard fire resistance of the load-bearing steel construction. Within a current national research project a natural fire scenario for the hollow space was developed based on realistic fire loads and ventilation conditions in the hollow space. Assuming this realistic fire scenario in the hollow space, two large scale tests on an innovative composite floor system were performed to evaluate the influence on the load bearing behaviour of the floor system. The integrated and sustainable composite floor system consists of a prestressed concrete slab, an unprotected, bisected hot rolled I-profile with composite dowels either in puzzle or clothoidal shape, and removable floor panels on the top of the I-profile. This floor system ensures the opportunity to adjust the technical building installations in accordance with the use of the building. This integrated and sustainable composite floor system was developed in several research projects. The standard fire resistance R90 for the fire scenario below the slab system has already been proven successfully. In this paper, experimental investigations regarding the heating and load bearing behaviour of the innovative composite floor system under the newly developed natural fire scenario of hollow spaces are presented. In doing so, the special test set-up to realise the fire tests for the fire scenario hollow space will be described in detail. After the fire scenario for the hollow space, the specimen was subjected to the ISO standard fire curve to establish the failure temperature of the unprotected I-profile. In addition to the temperature development and the load bearing behaviour inside the innovative floor during the heating phase, the cooling phase and the influence of a web opening on the load bearing behaviour will be discussed.
- PublicationFatigue of steel bridges(Editorial Universitat Politècnica de València, 2018-06-05) Kuhlmann, Ulrike; Bove, Simon; Breunig, Stephanie; Drebenstedt, Karl; Forschungsvereinigung Stahlanwendung, Alemania; Forschungsgemeinschaft Konstruktiver Ingenieurbau; Allianz Industrie Forschung, Alemania; Bundesministerium für Wirtschaft und Energie, Alemania[EN] Highway and railway bridges are exposed to cyclic stressing due to traffic loads and, therefore, have to be evaluated concerning fatigue. In most cases the fatigue evaluation is performed according to Eurocode 3 Part 1-9 on nominal stresses. To apply this nominal stress approach a detail catalogue is required classifying all relevant constructional details in terms of fatigue. Unfortunately, the existing detail catalogue of Eurocode 3 Part 1-9 reflects the state of the art of the 1990s and misses constructional details being important for today’s bridge design. As an example the derivation of a new detail, the so-called lamellae joint, is presented. Furthermore, for two new types of innovative steel bridges, where Eurocode 3 Part 1-9 does not yet specify rules able to evaluate the characteristics of these bridges, research results are shown. These are the thick-plate trough bridges and truss bridges made of thick-walled circular hollow sections (CHS). The paper starts with an overview on the recent Eurocode developments, addressing more specific the fatigue verification according to EN 1993-1-9 and the statistical analysis of fatigue test data. In the following, information is given on the outcome of some recent research projects striving to extend the application range of Eurocode 3 Part 1-9. The final conclusion, in spite of all differences, show a common tendency.
- PublicationPrimary breakup of liquids using a high-speed rotary bell atomizer for spray painting processes(Editorial Universitat Politècnica de València, 2017-07-28) Shen, Bo; Ye, Qiaoyan; Tiedje, Oliver; Domnick, Joachim; Allianz Industrie Forschung, Alemania[EN] The present contribution deals with numerical studies of the primary liquid breakup process using a commercial high-speed rotary bell atomizer. The first part of the investigations focuses on the film formation on the distributor disk and the inner surface of the rotary bell. Numerical simulations using the volume of fluid (VOF) approach were carried out. A non-Newtonian liquid is used to investigate the effect of the viscosity on the initial wetting, the film formation process and the film thickness distribution on the bell. The Herschel-Bulkley model is considered to describe the shear-thinning (pseudoplastic) behavior of the fluid. A non-homogeneous film structure is found on the inside surface of the rotary bell. This is also observed in experimental investigations using a high-speed camera. The following disintegration process is studied by applying an appropriately fine computational mesh. The VOF method and Reynolds stress model are used to calculate the disintegration process and the two-phase flow field. The numerical results are compared with images which are recorded by means of a high-speed camera.
- PublicationSpray drying of high viscous food concentrates: Investigations on the applicability of an Air-Core-Liquid-Ring (ACLR) nozzle for liquid atomization(Editorial Universitat Politècnica de València, 2018-09-07) Wittner, Marc; Karbstein, Heike; Gaukel, Volker; Allianz Industrie Forschung, Alemania[EN] Spray drying is widely used for powder production from liquid concentrates. Often low input temperatures are desired, as many materials, like proteins, are sensitive to heat. However, this demand leads to increased concentrate viscosities. Commonly used pressure swirl atomizers are limited concerning maximum processible viscosity. In this study, a so called Air-Core-Liquid-Ring Atomizer is used for pilot scale spray drying of whey protein concentrate (WPC80) at 40 °C and hence a viscosity of 0.09 Pa s. The produced powder was compared to an industrially produced reference. As a result, no significant differences in particle size distribution and particle morphology were observed.