Structural limits of FRP-balsa sandwich decks in bridge construction |
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| Affiliation: | 1. Department of Bridge Engineering, Tongji University, Shanghai, China;2. Department of Civil and Environment Engineering, University of California, Irvine, CA, USA;3. Department of Civil and Environmental Engineering, University of California, Davis, CA, USA;1. ICIST, Department of Civil Engineering, Architecture and Georesources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;2. LAETA, IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;1. Rzeszow University of Technology, 35-959 Rzeszow, Al. Powstancow Warszawy 12, Poland;2. Mostostal Warszawa S.A, 02-673 Warszawa, Ul. Konstruktorska 12A, Poland;1. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China;2. School of Civil Engineering, Southeast University, Nanjing 210096, China;3. Advanced Engineering Composites Research Center, Nanjing Tech University, Nanjing 211816, China;4. Department of Civil Engineering, Monash University, Clayton 3800, Australia |
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| Abstract: | The span limits of two glass fiber-reinforced polymer (GFRP) bridge concepts involving GFRP-balsa sandwich plates are discussed. The sandwich plates were either used directly as slab bridges or as decks of a hybrid sandwich-steel girder bridges. In the latter case, the potential of the sandwich decks to replace reinforced concrete (RC) decks was also evaluated. Taking the limits of manufacturing into account (800 mm slab thickness), maximum bridge spans of approximately 19 m can be reached with FRP-balsa sandwich slab bridges, if a carbon-FRP (CFRP) arch is integrated into the balsa core. Above this limit, hybrid sandwich-steel girder bridges can be used up to spans of 30 m. RC deck replacement requires timber and steel plate inserts into the balsa core above the steel girders. GFRP-balsa sandwich slabs or decks exhibit full composite action between lower and upper face sheets. Stress concentrations occur at the joints between balsa core and timber inserts which however can effectively be reduced by changing from butt to scarf joints. |
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| Keywords: | A Layered structures A Hybrid B Elasticity C Finite element analysis (FEA) Bridges |
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