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Behavior of Multispan Extradosed Bridge Subjected to Variation of Cable-Free Segment Length

Based on the main bridge of the Paira Bridge in Bangladesh, this paper studies the behavior of multispan extradosed bridge subjected to variation of cable-free segment length. First, a finite element simulation model was established, and linear analysis was performed. The accuracy of the finite element model was verified by comparing the measured data with the finite element analysis. Then the influences of the cable-free segment length in the midspan and the pylon root on the horizontal displacement of the pylon top, the vertical deflection of the midspan, and the bending moment of the main girder were analyzed, respectively. The results showed that the variation of the cable-free segment length put a significant impact on the horizontal displacement of the pylon top and the vertical displacement of the middle of each span. The increase of positive moment was greater than negative moment when the cable-free segment length in the middle of the span increased. However, when the cable-free segment length of the pylon root increased, the negative bending moment of the main girder increased more than the positive bending moment.