Abstract
A composite-metal hybrid assembling stringed truss bridge which based on pre-tightened tooth connection can make full use of the strength of the FRP fiber in the direction of the fiber, and is of higher bearing capacity than the FRP truss bridges with traditional adhesive or bolt connection. However, whether the calculation method of FRP truss bridge with traditional bondingor bolt connection is suitable for this new type of bridge needs to be researched because of the difference on the structural form and connection mode. In order to obtain the suitable method of this kind of bridge, a new method for calculating live load deformation which consider the influence of end of the steel bar sleeve of rod stiffness was established in this paper; the deformation experiment of truss bridge was carried out. The experiment and calculation results show: compared with the calculation method of the live load deformation of the traditional FRP truss bridge, the calculation method of live load deformation considering the effect of the steel sleeve on the end of the rod is in good agreement with the live load deformation obtained by the experiment; the calculation method of inelastic deflection has also been verified by the experimental results.
Highlights
FRP truss bridge which can make full advantage of high specific strength and stiffness along fiber direction of FRP materials has been widely recognized by researchers at home and abroad
It’s necessary to study whether the deformation calculation method used in the above-mentioned bonded or bolted FRP truss bridge is suitable for the composite-metal hybrid assembling stringed truss bridge
Composite-metal hybrid assembling stringed truss bridge differs from traditional FRP truss bridge in that its members are made up of composite materials, the joint of rods is made of pre-tightened teeth[14, 15], and the joint of truss segments is made of single-eared and double-eared joints
Summary
FRP truss bridge which can make full advantage of high specific strength and stiffness along fiber direction of FRP materials has been widely recognized by researchers at home and abroad. Compared with the bonded or bolted FRP truss bridges mentioned above, the compositemetal hybrid assembling stringed truss bridge can give better play to the along-fiber strength of FRP materials, so they have higher bearing capacity[12,13]. It’s necessary to study whether the deformation calculation method used in the above-mentioned bonded or bolted FRP truss bridge is suitable for the composite-metal hybrid assembling stringed truss bridge. The deformation calculation method of the composite-metal hybrid assembling stringed truss bridge is studied. Based on the analysis of the structural differences between composite-metal hybrid assembling stringed truss bridge and traditional FRP bridge, a new method is proposed by considering the influence of the steel sleeve at the end of the member on the stiffness of the member. The results of the above method are compared with those of the traditional method and experiment
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