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Bridge Bearings: Merits, Demerits, Practical Issues, Maintenance and Extensive Surveys on Bridge Bearing
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A technical solution to the problem of unavoidable movements in bridge structures is the use of bridge bearings. Bridge bearings are small integral parts of the entire

bridge structure serving several purposes, such as connection, transfer of forces, allowing movements, force damping etc. However, bridge bearings could create more

problems for the bridge structure than it solves if not properly understood, especially when it receives less attention than it deserves. Technical and practical issues, such

as selection of the right bearing type for use, merits and demerits of different bearing types, maintenance and monitoring, replacement, life cycle cost etc. are all

imperative to ensure that bearings satisfy their purpose.


This study takes into consideration the practical and theoretical experience available for the use of bridge bearings. Two electronic surveys were used to garner knowledge

and expertise from bridge engineers, bearing manufacturers and other stake holders in the course of this study, also practical knowledge concerning various types and

problems of bridge bearings, maintenance, repair and replacement, life cycle costing etc. were employed in addition to physical investigation of bridge bearings in the

Stockholm area of Sweden.


Generally, all bearing types were found to perform their functions satisfactorily when in good conditions, though inevitable problem of degradation reduces the life span of

these bearings, especially the ones made mainly of steel being affected by corrosion.

Those made of rubber components also degrade and perform poorly in low temperatures and under high load magnitude, though they are the most economical

solution to many problems, especially in seismically active areas. Modern and enclosed bearing types such as pot, spherical, disc, LRB, FPB etc. are best used in

critical conditions like high vertical load, extensive degree/extent of movement, seismic areas etc. but they are expensive solutions due to technicality in construction, and they are not exempted from various problems of degradation.

Place, publisher, year, edition, pages
Trita-BKN-Examensarbete, ISSN 1103-4297 ; 366
Keyword [en]
bridges, bearing types, merits and demerits, bearing maintenance, repair, replacement, retrofitting, LCC, survey on bridge bearings
Keyword [sv]
broar, lagertyper, fördelar och nackdelar, lagerunderhåll, reparationer, utbyte, efterjustering, LCC, studie om brolager
National Category
Infrastructure Engineering
URN: urn:nbn:se:kth:diva-104240ISRN: 1103-4297OAI: diva2:563627
Subject / course
Structural Design and Bridges
Educational program
Master of Science in Engineering - Urban Management
Available from: 2012-10-31 Created: 2012-10-30 Last updated: 2012-10-31Bibliographically approved

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