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The selection of the F80 type expansion joint size is critical, as it directly affects the service life and performance of the bridge. Proper design must account for sufficient expansion allowance to accommodate movement under various conditions. When the bridge's displacement direction is perpendicular to the centerline of the expansion joint, the F80 type is an ideal choice. However, if the displacement direction is at an angle relative to the centerline, the movement should be decomposed into two components—parallel and perpendicular to the centerline. The size of the F80 expansion joint is determined based on the larger of these two vectors.
The load-bearing system and displacement control mechanism in the F80 type expansion joint are designed separately, ensuring that they operate independently without interference. This clear division of functions enhances both safety during load application and uniform displacement. Unlike traditional designs where each middle beam was supported by two beams, the F80 system allows all middle beams to be supported on a single beam within the displacement control box. This innovation not only improves efficiency but also reduces the number of beams and minimizes the overall size of the displacement control unit, making it particularly suitable for large displacement applications.
Additionally, the F80 expansion joint is engineered to handle complex movements while maintaining durability and reliability. Its modular design allows for easy installation and maintenance, reducing long-term costs. By optimizing the structural layout, the F80 type ensures smooth operation even under extreme environmental conditions. This makes it a preferred choice for modern bridges requiring high-performance expansion solutions. Whether used in urban infrastructure or large-scale transportation projects, the F80 expansion joint provides a reliable and efficient way to manage thermal and mechanical stresses.
Division of load-bearing structure and displacement structure of F80 type expansion joint