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Author(s):	Stengel, Thorsten; Obermeier, Philipp; Zellner, Johannes
Title:	Nitratinduzierte Spannungsrisskorrosion in der Stahlbetonkuppel des Elefantenhauses Hellabrunn - Sprengung der historischen Stahlbetonkonstruktion nach 100 Jahren Nutzung
Abstract:	So stellt man sich einen 100sten Geburtstag nicht unbedingt vor: Am Vormittag des 12.09.2014 wurde die denkmalgeschützte Stahlbeton-Rippenkuppel des Elefantenhauses im Tierpark Hellabrunn in München wegen irreparabler Schäden an der Bewehrung mithilfe einer 250 kg-Ladung gesprengt. Vorausgegangen waren intensive mehrmonatige Baustoffuntersuchungen mit dem Ergebnis, dass der Betonstahl der historischen Stahlbetonkonstruktion in weiten Teilen durch nitratinduzierte Spannungsrisskorrosion erheblich geschädigt war. In der Folge musste das Elefantenhaus wegen Einsturzgefahr gesperrt und die Kuppel bis zur Sprengung notabgestützt werden. Der vorliegende Beitrag soll an die herausragenden ingenieurtechnischen Leistungen bei der Errichtung der Kuppel erinnern sowie die Zusammenhänge und Konsequenzen der nitratinduzierten Spannungsrisskorrosion erläutern. Nitrate induced stress crack corrosion within the cupola of the elephant's house Hellabrunn - Demolition of the historic cupola after 100 years That was not an usual hundredth birthday party: The historic and protected elephant's house at the zoo Hellabrunn was demolished by a blast in September 2014. During the preceding months an intensive inspection of the whole structure was conducted. Results showed that a considerable part of the reinforcement was irreparably affected by nitrate induced stress crack corrosion. Therefore, the elephant's house had to be closed and a temporary support was installed. The present paper illustrates the outstanding achievements during design and erection of the elephant's house and explains the mechanisms and consequences of nitrate induced stress crack corrosion of the reinforcement.
Source:	Beton- und Stahlbetonbau 114 (2019), No. 10
Page/s:	724-736
Language of Publication:	German

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