Integral bridges: an investigation of the soil-structure interaction problem using EPS foam and inclined abutments

Adamson, David (2016) Integral bridges: an investigation of the soil-structure interaction problem using EPS foam and inclined abutments. BEng dissertation, University of Portsmouth.

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    The removal of expansion and bearing joints in a bridge deck is considered a cost-effective form of infrastructure in terms of construction, maintenance and durability; this design is known as integral abutment bridge. In the UK the design and construction for this type of bridge is provided in the current document PD6694-1 which recommends all new bridges of less than 30° skew and 60m span to become integral. According to existing literature this had been established due to concerns of the structural and geotechnical stability of the intended bridge. The scale of the bridge is generally hampered by the lateral stresses induced from the inherent soil/structure interaction.
    Multiple exercises, investigations and case studies have suggested the usage of alternative lightweight material backfill to potentially reduce the amount of lateral stresses and increase the durability of integral bridges. Due to the complexity of the task it has resulted in the use of MIDAS CIVIL to perform a comparative finite element model of an integral bridge prototype to suggest an appropriate backfill/abutment design which could provide an alternative to current practices.
    The current practice for backfill 6N (gravel) has been compared with EPS geofoam blocks with varies inclined angles at the abutment. Simulated models with the abutment angles nearing the horizontal plane allowed for lesser tolerances to be place on the deck girder however due to loading transfer more reliance was required of the bridge abutment. Solutions from the models indicated that EPS geofoam provided small reduction in lateral loading averaging 89% moment/stresses of 6N fill while the optimum inclined abutment angle of 45° (1:1 gradient) provided a reductions averaging 25% of a vertical abutment.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 06 Sep 2016 12:48
    Last Modified: 06 Sep 2016 12:48

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