The bridge, spanning 130 meters in total, is a simply supported prestressed T-beam structure; the main girders currently exhibit multiple fine longitudinal cracks. Due to the passage of overweight, oversized special vehicles—loads far exceeding original design standards—sustained stress threatens to accelerate crack propagation and compromise structural stiffness. 

Taking into account bridge defects, the constraints of an extended construction phase, and the rigorous standards for heavy-load transport, the project utilizes prestressed carbon fiber plates for full-span strengthening. Continuous 100mm × 2mm prestressed carbon plates are installed along the full length of the T-beams—specifically within the critical mid-span load-bearing zones—to ensure structural continuity.

This strengthening initiative aims to enhance the flexural and shear load-bearing capacities of the main girders, strictly control cracking and deflection, and ensure structural continuity and long-term stability under repeated heavy-load traffic.

The advantages of prestressed carbon plates

• The uniform transfer of prestress avoids stress concentrations associated with splicing and fully utilizes the material's tensile properties, effectively enhancing the main girder's flexural load-bearing capacity. Meanwhile, the use of full-length carbon fiber plates comprehensively restrains cracking, optimizes girder stiffness, and precisely controls deflection, ensuring the bridge's long-term safety and stability under repeated heavy loads.

• Prestressed carbon fiber plates ensure a stable state of tensile stress, eliminating the risk of plate damage at the source and laying a solid foundation for the long-term performance of the entire strengthening system.

• With an anchorage efficiency exceeding 95%, it resolves construction challenges such as the positioning of extra-long panels, susceptibility to misalignment during tensioning, and uneven stress distribution.

After bridge strengthening:

1) The flexural and shear load-bearing capacities of the main girders are substantially increased, ensuring an ample safety margin and thoroughly resolving the issue of insufficient load-bearing redundancy.

2) Existing cracks are effectively controlled, and the girder stiffness and overall structural stability are significantly enhanced.