Concrete under pylon saddles in extradosed cable-stayed bridges is usually subjected to tremendous cable force,which might easily cause cracking or crushing of concrete and lead to potential structural security problems.At present,the finite element mechanical analysis model for the cable saddle is not accurate enough to analyse the real stress situation.A stress analysis method of concrete under the cable saddle based on the accurate finite element model is presented in this paper.In order to obtain the exact stress results of the concrete under the saddle,this paper modelled the filament dividers in the saddle one by one,and established the loading surface element on the surface of each filament divider layer to apply the equivalent surface force layer by layer.In addition,this paper also studied the stress characteristics of the lower tower column in the tower bridge,and put forward structural reinforcement suggestions for the force of the lower tower column.The results of this paper can provide reference for the design and construction control of pylons in extradosed cable-stayed bridge.
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