Maintenance And Control Of The Transportation
Archaeology: Structural Evaluation Of An
Historical Suspension Footbridge
Author(s)
C. Gentile & N. Gallino
Abstract
The paper summarises the application of a dynamic-based methodology for the
structural evaluation of an historical suspension bridge. The methodology is
based on a field survey of the actual deformed configuration due to dead load,
ambient vibration measurement of the response under pedestrians and windinduced
excitation, modal identification and finite element model updating.
The investigated bridge, dating back to 1928, is about 92.0 m long and is
characterised by a timber floor system supported by two couples of cables that
were recently replaced, in order to bring the structure up to satisfactory standards
of safety for pedestrian loads and light vehicular traffic.
Keywords: ambient vibration testing, Frequency Domain Decomposition, finite
element model updating, output-only modal identification, suspension bridge.
1 Introduction
Many of the suspension bridges originally built with timber floor system after
the second half of the 19th century still stand today. These bridges should be
considered as historic documents, integrating part of the territory landscape but
also as an important resource.
A good example is the Morca suspension bridge (Figs. 1-3), completed in
1928, over the Sesia river in northern Italy. The bridge belongs to the traditional
and cultural heritage of the region where 9 suspension bridges have been
constructed between 1843 and 1928 [1], with 3 of these bridges still standing
today.
The suspended deck, about 92.0 m long, is in solid timber boards and is
supported by two couples of cables that were recently replaced, in order to bring
Keywords
ambient vibration testing, Frequency Domain Decomposition, finite
element model updating, output-only modal identification, suspension bridge.
Related Book
Other papers in this volume
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