Bending Capacity of Timber Beam Stiffened with Orthotropic Sieel Deck

研究了双对称复合木梁的抗弯性能。组合梁由矩形截面的胶合层合木材和两片在木材的上下表面垂直插入的钢板组成，肋板和木材用环氧树脂连接在一起。给出了屈服弯矩、肋钢板截面完全塑性弯矩和木材边缘应力达到抗弯强度的弯矩。给出了简梁跨中弯矩所对应的挠度，并与实验结果进行了比较。本文还研究了由胶合双木梁和正交各向异性钢桥面组成的复合桥的抗弯能力。将焊接在钢甲板上的肋板插入到梁的上部缝中，肋板也插入到梁的下部缝中，并用环氧树脂连接在一起。采用考虑剪切变形影响的组合梁理论计算了梁的屈服弯矩、下肋全塑性弯矩和脆性破坏弯矩。建立了跨度为5m、巷道宽度为1.67m的1/3缩小模型，并在跨中一点荷载下进行了试验。结果与预测值进行了比较。在最终状态前观察到木梁和肋钢板的分解。

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.