Research on construction control of single-pylon steel-concrete composite girder cable-stayed bridge

Le résumé fourni par la source

This study investigates construction control strategies for a single-pylon cable-stayed bridge with a steel-concrete composite main girder and prestressed reinforced concrete side spans. A staged finite element model in Midas/Civil simulates the construction sequence, including deck crane effects, segmental erection, and stay-cable stressing. The analysis addresses girder alignment, stress distribution, internal forces, and stay-cable force evolution from large-cantilever erection through closure, secondary dead load application, to ten-year service. Results show that the steel box girder cambers during erection due to initial stay cable tensions. The camber decreases after closure, and converts to slight sag after secondary dead loads. Top‑slab stress peaks at closure and reduces after the application of secondary dead loads. The bottom slab remains in compression throughout, with a maximum compressive stress of about 37.2 MPa after ten-year service. Internal forces show axial compression along the girder. Cable forces increase with segment erection and secondary dead loads and approach target values. These findings support practical control of cable forces, segment geometry, and secondary dead loads to achieve target alignment and stress states in single-pylon composite cable-stayed bridges.

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