A small bridge, just 5m span, used to gain public access across a drainage ditch into a local nature reserve. The client was concerned that a traditional timber structure would have reduced durability due to damp environment, so selected the FRP option to reduce maintenance and subsequent whole life cost. Its very well used by a lot of happy, wet and very muddy dogs!
The outputs from the design process were;
- Designed to the requirements of Eurocodes, and CUR Recommendation 96
- The maximum deflection under a characteristic live load of 5kN/m2 was 30mm, less than span/100
- The minimum natural frequency was 7.0 Hz, Greater or equal to 2.3Hz
- All strains were kept below allowable limits under ULS load cases
- Bolted connections shall accommodate an allowance of at least +/-2.5mm for thermal expansion