28 research outputs found
Shear and Anchorage Behaviour of Fire Exposed Hollow Core Slabs
No full textHollow core (HC) slabs are made of precast concrete with pretensioned strands. These slabs are popular as floor structures in offices and housing. At ambient conditions, the load bearing capacity can be dominated by four different failure modes, i.e. flexure, anchorage, shear compression and shear tension. As the economic production process does not allow for the inclusion of mild reinforcement, the slabs rely on the tensile strength of concrete for the shear and anchorage capacity. When exposed to a fire, the HC slabs have to maintain their load bearing and separating function for a certain time in order to facilitate the fire fighting actions and to provide sufficient time for the users of the building to escape and for rescue teams to search the building. Current design codes consider only flexural failure, while fire tests carried out in the past showed that the other failure modes can dominate the fire behaviour as well. As a result, design codes might overestimate the actual performance of fire exposed HC slabs. However, the experiments might represent a worst case compared to the practice. At least, fatalities caused by a premature collapse of fire exposed HC slabs, have never been reported up to the author's knowledge. Because there is a lack of fundamental understanding of the shear and anchorage behaviour, an optimum design between safety and economics can yet not be achieved. The objective of the research presented in this thesis is to gain a basic understanding of the shear and anchorage behaviour of fire exposed HC slabs and to develop FE models to predict this behaviour. With the models, design measures to improve the behaviour can be evaluated. The field of application is limited to HC slabs in accordance with the European product standard prEN 1168 [1197], exposed to standard fire conditions and simply supported on rigid supports like walls. The results are on the safe side for HC slabs with restraining support conditions.Civil Engineering and Geoscience
Uitgerekend brand. Nieuwe versie van Brawesta
No full textOnbekendheid met het fenomeen brand vormt nog vaak een obstakel om staal in constructies toe te passen. Dit blijkt onder meer uit de vele vragen die de Helpdesk van het Staalbouw Instituut bereiken. Nogal wat vragen gaan over het bepalen van de brandwerendheid. Voor dit onderwerp is het computerprogramma Brawesta een goed hulpmidde
Fabrieksschema Terramycine
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
Rigid-body Simulation using Gaming Engines: A Study on the Usability of Gaming Industry Software for Simulating Engineering Problems
No full textPrecision and Microsystems EngineeringMechanical, Maritime and Materials Engineerin
AN UNALIENABLE RIGHT TO VIRTUE: Explorations on Aristotelian Civic Virtue in the Context of the Founding of the United States of America
No full textThis paper explores the role of Aristotelian ideas on civic virtue in the founding of the United States political system. By having Aristotle’s thinking engage with the so-called ‘Charters of Freedom,’ the author uncovers parallels between the notions of civic virtue established by the classical philosopher and the thinking that served as foundational to the United States political context. The author does so by first presenting and analyzing Aristotle’s ideas on ethics and politics before showing how similar connections between the ethical and political are expressed within the founding documents of the United States. The author relates this examination to a contemporary context that raises the question of why appeals to civic virtue are a recurring phenomenon in American politics, notwithstanding rather forceful historic and contemporary populist currents. The understanding of Aristotle’s ideas developed here by the author foreground the extent to which an Aristotelian-like appeal to rational civic virtue is in fact deeply ingrained in American politics
Steel intensive systems for shallow floor construction: Final report
No full textCivil Engineering and GeosciencesStructural Engineerin
