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Bridge management 3 : inspection, maintenance, assessment, by J.E. Harding, G.E.R Parke, M.J. Ryall, Professor J E

By J.E. Harding, G.E.R Parke, M.J. Ryall, Professor J E Harding, Parke Gerard, M Ryall

This quantity comprises the papers awarded on the 3rd overseas convention on Bridge administration, held on the college of Surrey, Guildford, united kingdom on 14-17 April 1996.

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Sample text

It is assumed that the pile load capacity may be described by the sum of basically two contributions, namely a contribution from the pile surface (shaft and foot) and a contribution from the pile tip, see Fig. 3. As the piles are located in a two layer soil structure the pile load carrying capacity may be expressed by: QP=Q1+Q2+Q3+Q4 where Q1 is the contribution from the pile shaft in cohesion soils. Q2 is the contribution from the pile shaft in friction soils. Q3 is the contribution from the surface of the pile foot.

Keywords: Reassessment, Safety Formats, Reliability Analysis, Pile Strength Models. 1 Introduction As a part of the general evaluation of the bridges on the Danish motorway system a routine reassessment of the load carrying capacity and the residual life of the motorway bridge over the Gudenå river was initiated in 1994 by COWIconsult for the Danish Road Directorate. The Gudenå bridge was originally opened in 1971 as the first part of the north-south oriented motorway of Jutland connecting, as a part of the Europe road 45 system (E45), Norway in the north with the African continent in the south.

Q3 is the contribution from the surface of the pile foot. Q4 is the contribution from the pile tip. (1) 40 Bridge Management 3: Inspection, Maintenance, Assessment and Repair Fig. 3. Principal illustration of the pile and the soil structure. It may be assumed that the pile tip carrying capacity at the time of the pile driving can be estimated from the pile driving journals and by application of the standard pile driving formula from the Danish codes (DDR). g. [4] a discrepancy is observed. This discrepancy may appropriately be described by a systematic term (bias) and a random term (noise).

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