Tianjin Haihe Bengbu Bridge is built in CBD of Tianjin city and crosses the Haihe River;it is dissymmetrical steel bridge of three dimensions Beam-Arch Combination System.The bridge is complex for both mechanical and tectonic consideration.The bracing member of abutment 1st and 6th are designed specially,which connect the main girder of the bridge and the rubber bearing of abutment.These buttress braces are designed uniquely in the world,in order to transfer large-tonnage axial load,including compressive force and tensile force,to bearings.The loading behavior of them are significant effect to the security of the bridge and need to be analyzed specially,so a 1:2.5-scale model is made,destructive experiment of experimental member is done.Experiment member is elastic based on experimental data at tension load;limit axis load is 3002kN when the member is buckling.Except model experiment,a finite element analysis of model is also essential.Through experiment and finite element analysis,the reliability and safety of the bearings are verified.