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The selection of the F80 type expansion joint size is crucial for ensuring long-term performance and reliability. The dimensions of the expansion joint are directly influenced by its expected service life, so proper expansion allowance must be considered during the design phase. 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, it should be broken down into two components—one parallel and one perpendicular to the centerline. The size of the F80 type expansion joint is determined based on the larger of these two components.
One of the key features of the F80 type bridge expansion joint is its separate load-bearing structure and displacement control system. This design ensures that the two systems operate independently without interfering with each other, which enhances both safety and uniform movement. Unlike traditional methods where each middle beam was supported on two separate beams, the F80 type allows all middle beams to be supported on a single beam within the displacement control box. This innovation is particularly beneficial for large displacement applications, as it reduces the number of required beams and minimizes the overall size of the displacement control unit, making it more efficient and compact.
In addition, this structural design improves the durability and stability of the expansion joint under various loading conditions. It also simplifies maintenance and installation processes, making it a preferred choice for modern bridge construction projects. By optimizing the interaction between load distribution and displacement control, the F80 type expansion joint offers a reliable solution for bridges that experience significant movement due to temperature changes, traffic loads, or seismic activity.
Division of load-bearing structure and displacement structure of F80 type expansion joint