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Author(s):	Steven, Guido; Empelmann, Martin
Title:
Abstract:	Mit dem Einsatz von ultrahochfestem Beton und hochfester Längsbewehrung kann die Tragfähigkeit von Stahlbetonstützen deutlich erhöht werden. Um dieses Potenzial erschließen zu können, muss das Tragverhalten infolge Normalkraft und Biegung bekannt sein. Am iBMB, Fachgebiet Massivbau der TU Braunschweig, wurden im Rahmen des von der Deutschen Forschungsgemeinschaft geförderten Schwerpunktprogramms SPP 1182 [1] experimentelle und theoretische Untersuchungen zum Trag- und Nachbruchverhalten von Stützen aus ultrahochfestem Faserbeton (UHPFRC) mit hochfester Längsbewehrung unter zentrischem und einachsig exzentrischem Längsdruck durchgeführt. In diesem Beitrag werden die Untersuchungsergebnisse und ein hieraus abgeleiteter Vorschlag zur Bemessung von gedrungenen UHPFRC-Stützen in Anlehnung an den EC2 [2] vorgestellt. Zugleich werden Empfehlungen zur konstruktiven Durchbildung gegeben, die ein progressives Versagen verhindern. UHPFRC-Columns with high-strength longitudinal reinforcement The bearing capacity of reinforced compression members can be significantly increased by the use of ultra-high performance fibre reinforced concrete (UHPFRC) and high-strength longitudinal reinforcement. To develop this potential for reinforced concrete columns the bearing behaviour under axial force and bending must be known. The iBMB, department of concrete structures of the TU Braunschweig, has conducted experimental and theoretical research works on the bearing and post-fracture behaviour of UHPFRC-columns with high-strength longitudinal reinforcement under centric and eccentric loads within the priority program SPP 1182 [1], which was funded by the German Research Foundation. This paper presents the results of the investigations and a proposal for the dimensioning of short UHPFRC-columns in dependence on EC2 [2] and recommendations for a structural design in order to avoid a progressive collapse.
Source:	Beton- und Stahlbetonbau 109 (2014), No. 5
Page/s:	344-354
Language of Publication:	German

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