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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 48
INNOVATION IN CIVIL AND STRUCTURAL ENGINEERING Edited by: B.H.V. Topping and M.B. Leeming
Paper IX.3
The Effect of Material Stiffness upon the Modal Characteristics of Arch Bridges A. Bensalem, C.A. Fairfield and A. Sibbald
Department of Civil and Transportation Engineering, Napier University, Edinburgh, United Kingdom A. Bensalem, C.A. Fairfield, A. Sibbald, "The Effect of Material Stiffness upon the Modal Characteristics of Arch Bridges", in B.H.V. Topping, M.B. Leeming, (Editors), "Innovation in Civil and Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 301-309, 1997. doi:10.4203/ccp.48.9.3
Abstract
This paper presents the results of an experimental and
finite element analysis studying the effect of backfill
materials on a brickwork arch bridge's dynamic
behaviour. Three different backfill materials were
investigated namely: coarse gravel, sand, and Type 1 fill.
The experimental dynamic characteristics of the arch
bridge were determined using an impact hammer testing
technique. A 3-D finite element model was adopted to
study the dynamic behaviour of the arch using natural
frequency and mode superposition analyses. The damping
ratios obtained experimentally were used in comparison
with the numerically modeled response of the arch to
impact loading. The comparison between the finite
element model and those results obtained experimentally
was good, both in the time and frequency domains. It was
found that the introduction of the backfill material
decreased the resonant frequencies, while the damping
ratios were increased. The finite element model was also
used to study the effect of changes in the stiffness of the
backfill material of the arch, to model different
compaction levels. The overall aim was to provide a
better understanding of the dynamic behaviour of
masonry arch bridges for non-destructive testing
procedures.
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