Behaviour of post-installed anchors in case of fire

Title: Behaviour of post-installed anchors in case of fire
Author(s): K. Bergmeister, A. Rieder
Paper category : conference
Book title: International Symposium on Connections between Steel and Concrete
Editor(s): R. Eligehausen
Print-ISBN: 2-912143-25-X
e-ISBN: 2351580346
Publisher: RILEM Publications SARL
Publication year: 2001
Pages: 320 - 328
Total Pages: 9
Nb references: 3
Language: English

Abstract: Due to the loss of strength of concrete and steel at high temperatures the load capacity of anchors in case of fire is expected to be reduced. Especially in tunnels post-installed anchors are commonly used to fix heavy equipment like ventilators, which must not fall down and injure or even kill escaping people or firemen in case of an accident with releated break-out of fire. The failure mode of expansion or undercut anchors depends primarily on the embedment depth: for small embedment depths concrete spalling will be decisive, steel failure usually is the consequence of large embedment depths. Another important feature is the effect of cracked concrete (w = 0.3 mm).

In an experimental setup in a real motorway tunnel the behaviour of expansion and bonded anchors is tested in cracked and uncracked concrete during a fire. For this purpose an axial load is applied and the temperature in different depths and the displacement of the anchors are measured continuosly.

Online publication: 2009-12-31
Publication type : full_text
Public price (Euros): 0.00