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Steel and Composite Structures
  Volume 27, Number 5, June10 2018 , pages 647-659

Influence of shear bolt connections on modular precast steel-concrete composites for track support structures
Olivia Mirza and Sakdirat Kaewunruen

    Through extensive research, there exist a new type of connection between railway bridge girders and steel-concrete composite panels. In addition to conventional shear connectors, newly developed blind bolts have been recently adopted for retrofitting. However, the body of knowledge on their influence and application to railway structures has not been thoroughly investigated. This study has thus placed a particular emphasis on the application of blind bolts on the Sydney Harbour Bridge as a feasible alternative constituent of railway track upgrading. Finite element modeling has been used to simulate the behaviours of the precast steel-concrete panels with common types of bolt connection using commercially available package, ABAQUS. The steel-concrete composite track slabs have been designed in accordance with Australian Standards AS5100. These precast steel-concrete panels are then numerically retrofitted by three types of most practical bold connections: head studded shear connector, Ajax blind bolt and Lindapter hollow bolt. The influences of bolt connections on load and stress transfers and structural behaviour of the composite track slabs are highlighted in this paper. The numerical results exhibit that all three bolts can distribute stresses effectively and can be installed on the bridge girder. However, it is also found that Lindapter hollow bolts are superior in minimising structural responses of the composite track slabs to train loading.
Key Words
    steel-concrete composites; railway track slabs; track support structures; modular precast composites; bolt connections
(1) Olivia Mirza:
School of Computing, Engineering & Mathematics, University of Western Sydney, Kingswood, NSW 2747 Australia;
(2) Sakdirat Kaewunruen:
Birmingham Centre for Railway Research and Education, School of Civil Engineering, The University of Birmingham, Edgbaston, B15 2TT, UK.

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