Model Test And Research About Carrying Capacity Of Bridge Deck Slab Stiffened By Lengthways Bars

In latest years, the wider bridge deck slab of PC double-triangle side box girder is more and more used in long-crossing cable-stayed bridge. In this case, there is a new structural measure that setting lengthways stiffened bars under the bridge deck slab in order to improve the loading ability of the bridge deck slab. After setting lengthways stiffened bars under the bridge deck slab, it is complicated for its supporting system and effect internanl force of the bridge deck slab. Based on the model test and analysis of 3D limited units, this paper studies the internal force of lengthways stiffened bridge deck slab of double-triangle side box girder.Based on the organic glass model test and analysis of 3D limited units, this paper conclused that lengthways stiffened bars evidencely improve the lenthways internal force of the bridge deck slab; but they do not improve the transverse internal force of the bridge deck slab. The analysis of the bridge deck slab of double-triangle side box girder by analysis of 3D limited units almostly same as the conclusion of the model test proves that it is doable to analys this kind of bridge deck slab by analysis of 3D limited units.Impressibility analysis of the bridge deck slab by changing the size and the site of the stiffened bars indicates that the size of the stiffened bar is suitable when the stiffeness rate i is between 3 and 25; the carrying capacity of the double lengthways stiffened bridge deck slab is better than the carrying capacity of the sinlge lengthways stiffened bridge deck slab and the triple lengthways stiffened bridge deck slab.According to the conclusions of model test and the analysis by ANSYS, the paper bring forward a simple method used in actrual work to calculating the internal force of the bridge deck slab when the load acts in the centre of the bridge deck slab.