N°207. 1991. Fastenings to Reinforced Concrete and Masonry Structures. Vol. 2
(1991; ISBN 978-2-88394-011-6 and -012-3; 562 pages; for printed revised hardbound edition see N° 216).
Modern fastening technique is increasingly used tor transfering concentrated loads into concrete and masonry structures. Used are cast-inplace systems, which are pl aced in the formwork before casting the concrete and post-instal led systems , which are instal led in hardened structural concrete or masonry. In spite of the tact that many fastening assemblies are carried out every day in practice, the knowledge in the engineering profess ion about their behavior is gene rally rather poor. Furthermore, there exists no generally accepted design method.
In this report , an attempt has been made to compile and compare the worldwide available results of experimental and theoretical investigations on the behavior of fastenings in structural concrete and masonry.
The performance of different anchor types, including cast-in-place (e.g. headed anchors, channel bars) and post-installed systems (e.g. expansion -, undercut -, and bonded anchors, plastic - and powder-actuated fasteners) is presented both in uncracked and cracked concrete as well as in masonry. Considered are different loading directions (tension , shear, and com bined tension and shear as well as bending of the anchor or of the baseplate) and load types (static, sustained, fatigue, seismic and impact) . Fai lure modes and load-displacement behavior are described and the effects of the main influencing parameters such as edge distance, spacing, load excentricity and reinforcement are discussed. Furthermore, environmental influences (e.g. temperature variations, corrosion, ultra-violet light) and the anchor behavior in case of fire are add ressed and also the influence of anchor loads on the strength of the structural member serving as the base material . Finally the behavior of con crete in tension an d theoretical approaches to predict the anchor behavior are reviewed.
The Task Group Vl/5 has tried to take into account all work that has been published up to April 1991 .
The report shows, that many areas are rather well understood , e.g. the failure process and the influencing factors in the case of a steel - or concrete failure under monotonic, sustained or fatique loading. However, in other areas more research work is needed, e.g. to r fastenings under seismic excitations , fastening assemblies in the case of fire or fastenings in masonry.
Based on this state-of-the-art report a unified consistent method tor design of fastening assemblies will be recommended and measures to avoid a reduction of strength of the structural member in which the fastening is installed will be proposed in an upcoming report.
