Bending Capacity of Timber Beam Stiffened with Orthotropic Sieel Deck

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The bending capacity of a doubly symmetric composite timber beam is invesligated. The composite beam consists of giued-laminated timber with a rectangular cross section and two robbed steel plates inserted vertically at the top and bottom surfaces of timber, the ribbed plates and timber being joined together with epoxy resin. The yield moment, as well as the moment at which the cross section of ribbed steel plates are wholly plastic and the moment at which the edge stress of timber reaches bending strength are presented. The deflection corresponding to these moments at mid-span of a simple beam are also presented and copmpared with the experimental ones.The bending capacity of a composite bridge consisting of glued-laminated double timber beams and orthotropic steel deck is also investigated. The ribbed plates welded to steel deck are inserted to upper slits of beams and the ribbed plates are also inserted to lower slits of beams and these are joined together with epoxy resin. The yield moment, She lower rib wholly plastic moment and the brittle failure moment of beam are calculated by using the composite beam theory considering effects of shear deformation. The 1/3 reduced models having the span length of 5m and the roadway width of 1.67m were built up and tested under one point loading at mid span. The results were compared with predicted values. The decomposition of timber beam and ribbed steel plates were observed just before final state.