By C. Melbourne
Within the 20th century bridge engineers have visible many alterations. Advances in expertise, fabrics and engineers knowing of structural behaviour and strategies of study has awarded possibilities for innovation and feature ended in more and more subtle recommendations to the fundamental challenge of delivering a bridge over a disadvantage.
However, regardless of those cutting edge technological adjustments, the masonry arch bridge has proven itself to be a sturdy, within your budget constitution, tolerant of its smooth atmosphere and out-performing lots of its opponents
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Extra info for Arch bridges : proceedings of the First International Conference on Arch Bridges, held at Bolton, UK on 3-6 September 1995
0 respectively. Time-dependent loading from strong winds in storm conditions might be expected to produce a dynamic response within the bridge. An investigation was made of its likely behaviour using modern methods of assessing wind loads . 62 was calculated for the central span of the structure using the technique described in BS 63993. This value suggests that the structure is "mildly dynamic", ie. its maximum amplitude of response can be determined by multiplying the response of the structure under equivalent static loading by a factor C R .
In some cases the original structure was not long enough and the parapet was very near the edge of the carriageway, which had possibly been widened over the years. In these cases the brick arch barrels of the culverts have been extended and a new parapet headwall built at a safe distance from the edge of the carriageway. 44 GENERAL In the two cases where collapse of brick arch structures occurred, this was caused by drainage boards deepening the inverts of the water courses downstream of the culverts.
In addition, there is a photograph of the structure, a location plan and a cross section through the structure. On the reverse of the form a record of bridge inspection and maintenance work is made for future reference. The preparation of this information took approximately 5 years to complete - Over the last 20 years however, the value of this information has proved invaluable over and over again. CONDITION OF THE BRIDGE STOCK IN 1974 It soon became apparent once the inspection reports were completed that many of the structures were in poor condition.