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Achieving Composite Action in Existing Bridges: With post-installed shear connectors
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The increased amount of traffic combined with higher traffic loads leads to many existing bridges needing strengthening in the future to ensure their expected lifespan. This means the bridge owners will be focusing more on strengthening projects and smart solutions will be crucial for preserving a healthy bridge stock.

When strengthening existing non-composite bridges (with steel girder and concrete deck) one potential method is to achieve composite action by installing shear connectors. The post-installed shear connectors prevent slip between the steel girders and the concrete. The composite action will reduce bending stresses and deflection of the bridge, due to the increase in moment of inertia and relocation of the neutral axis.

Different types of shear connectors can be used for achieving composite action and each type of connector has its own installation method. The biggest distinction between the methods is how the connectors gain access to the steel girder for installation and what technique is used when installing them.

This thesis presents the theory behind composite action, the current methods used for achieving composite action on existing bridges and to what extent a bridge can be strengthened by composite action. The thesis also provides a status of the existing road bridge stock around the world.

The four case studies examined in this thesis have used different post-installed shear connectors to manage different strengthening problems like weight restriction, fatigue life of shear connectors and a unique problem on the Pitsund Bridge where loud bangs appeared from the bridge when truck passed in the morning. For the case study on the Pitsund Bridge an interview was conducted that explains the entire procedure of the project, from the noise problem to how the installation of coiled spring pins was performed.

The bridge over Lule River at Akkatsfallen consists of two steel girders and a concrete deck. This bridge is chosen as a real case study to determine to what extent a bridge can increase its capacity by achieving composite action. The calculations are performed in accordance with the Eurocodes on both non- and full-composite action and the result is compared to the other case studies.

Place, publisher, year, edition, pages
2017. , p. 109
Keywords [en]
Shear connector, Composite action, post-installed, strengthening, Pitsund Bridge, coiled spring pins
Keywords [sv]
Skjuvförbindare, Samverkansbroar, förstärkningsarbete, Pitsundsbron, spiralbult
National Category
Infrastructure Engineering Construction Management
Identifiers
URN: urn:nbn:se:ltu:diva-61492OAI: oai:DiVA.org:ltu-61492DiVA, id: diva2:1066328
Educational program
Civil Engineering, master's level
Supervisors
Examiners
Available from: 2017-03-14 Created: 2017-01-17 Last updated: 2017-03-14Bibliographically approved

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