HEALTH‑MONITORING‑BASED INVESTIGATION OF THERMAL EFFECTS ON DOUBLE‑RIBBED PLATE GIRDERS OF CABLE‑STAYED BRIDGES
Keywords:
Health monitoring, Cable-stayed bridge, Double-ribbed plate girder, Temperature field, Temperature gradientAbstract
To investigate the temperature-induced effects on double-ribbed plate girders in cable-stayed bridges, this study leveraged health-monitoring data from the Poyang Lake Bridge. The temperature field distribution was analyzed using ABAQUS, and a full-bridge model was established in Midas/Civil 2021 to examine the mechanical responses of the main girder under overall temperature differences and temperature gradients. The results showed that under the overall temperature drop of 19 °C, the main girder experienced a maximum tensile stress of 6.44 MPa, with extreme vertical and longitudinal displacements of 21.3 mm and 54.6 mm, respectively. Under the overall temperature rise of 21 °C, the maximum compressive stress reached -7.12 MPa, and the extreme vertical and longitudinal displacements were 23.5 mm and 60.4 mm, respectively. Under a positive temperature gradient, the maximum compressive and tensile stresses were -5.47 MPa and 3.52 MPa, respectively, with extreme vertical and longitudinal displacements of 55.1 mm and 26.5 mm. Under a negative temperature gradient, the maximum tensile and compressive stresses were 1.81 MPa and -3.03 MPa, respectively, with extreme vertical and longitudinal displacements of 32.8 mm and 13.5 mm. A comprehensive comparison reveals that the overall temperature difference exerts a more pronounced influence on longitudinal displacement, whereas the vertical temperature gradient, has a more dominant effect on vertical displacement.References
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