Development of connections for fibre reinforced bridge elements and an analysis of sustainability
Doktorsavhandling, 2015

The deterioration of existing bridge structures due to a number of causes has led researchers to pursue new construction materials with high performance, such as fibre reinforced polymer (FRP) composite materials. The inherent properties of FRP materials are their light weight, high strength and high resistance to aggressive environments. Thanks to their light weight and the potential for prefabrication, the use of FRP bridge elements brings the benefits of industrial bridge construction and swift on-site assembly, resulting in the minimisation of traffic disruption. The application of FRP members in bridges started in the early 1990s and there remains a need for research in various technical areas. To map out these areas and specify the current level of knowledge, a literature review focusing on FRP bridge decks was carried out. This resulted in the identification of a number of research needs and two of them were pursued for research in this thesis. The first was to determine the potential of bridges with FRP bridge decks with respect to sustainability. Life-cycle cost analyses and life-cycle assessments in terms of carbon emissions were carried out on an existing steel-concrete bridge with a deck that had deteriorated where two scenarios were compared: the total replacement of the bridge with a new steel-concrete bridge and the replacement of the concrete deck with an FRP deck. The analyses revealed that the latter scenario contributes to potential cost savings and a reduced environmental impact in terms of carbon emissions over the life cycle of the bridge. The second identified research need was the development of integral connections and joints which enable rapid on-site assembly. Firstly, an innovative panel-level connection was developed by following an approach in which the bridge owner, designer, manufacturer and contractor were all involved. Numerical and experimental work was carried out to investigate the overall structural behaviour of the developed connection. The results showed that the proposed connection has good potential to be used for FRP decks, but more experimental tests encompassing specimens with a higher level of precision are required. In addition, a detailed study of bolted joints with the aim of obtaining non-slip joints, when clearance is present, in the service state of bridges was carried out. The utilisation of steel inserts and pretensioned bolts was investigated numerically and experimentally. The results indicated that it is possible to benefit from the bolt tension and rely on the load being transferred by friction if steel inserts are used. Bolt-tension-relaxation issues are reduced by using inserts and joint efficiency can be increased.

bridge

insert

connection

deck

FRP

bolt

joint

fibre reinforced polymer

LCC

LCA

VG-salen, Sven Hultins gata 6, Chalmers University of Technology
Opponent: Prof. J. Toby Mottram, School of Engineering, University of Warwick, Coventry, UK

Författare

Valbona Mara

Chalmers, Bygg- och miljöteknik, Konstruktionsteknik

Bridge decks of fibre reinforced polymer (FRP): A sustainable solution

Construction and Building Materials,; Vol. 50(2014)p. 190-199

Artikel i vetenskaplig tidskrift

A novel connection for fibre reinforced polymer bridge decks: Conceptual design and experimental investigation

Composite Structures,; Vol. 117(2014)p. 83-97

Artikel i vetenskaplig tidskrift

Improving the performance of bolted joints in composite structures using metal inserts

Journal of Composite Materials,; Vol. 50(2015)p. 3001-3018

Artikel i vetenskaplig tidskrift

Review of FRP decks: structural and in-service performance

Proceedings of the Institution of Civil Engineers: Bridge Engineering,; (2015)p. 308-329

Artikel i vetenskaplig tidskrift

Drivkrafter

Hållbar utveckling

Styrkeområden

Building Futures

Ämneskategorier

Samhällsbyggnadsteknik

ISBN

978-91-7597-260-2

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 3941

VG-salen, Sven Hultins gata 6, Chalmers University of Technology

Opponent: Prof. J. Toby Mottram, School of Engineering, University of Warwick, Coventry, UK