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Traditional Arch Bridge Construction and Retaining Wall Solution

Learn how to address the challenge of tension in masonry arch construction using a unique method of pre-compression with dirt to strengthen the structure. Discover the funicular nature of arches and how this indeterminate problem can be solved easily.

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Traditional Arch Bridge Construction and Retaining Wall Solution

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  1. Arches

  2. Closed Spandrel Masonry Arches Sprandrel Retaining Wall Arch

  3. Traditional Arch Bridge Construction Spandrel Retaining Walls

  4. Traditional Arch Bridge Construction Filled with dirt, up to road level

  5. Traditional Arch Bridge Construction Spandrel Walls Arch Filled with dirt, up to road level

  6. Traditional Arch Problem • The funicular shape for dead load is a parabola

  7. Traditional Arch Problem • The funicular shape for dead load is a parabola • When a point load is applied (say, a horse), it is no longer funicular. Bending moment is present. Masonry cannot take tension. It might collapse.

  8. Traditional Arch Solution • Use A LOT OF DIRT

  9. Traditional Arch Solution • Use A LOT OF DIRT • Huge dead loads pre-compress the masonry so much that the tension from the bending action of a Horse Load will never overcome the compression

  10. Traditional Arch Solution • Use A LOT OF DIRT • Huge dead loads pre-compress the masonry so much that the tension from the bending action of a Horse Load will never overcome the compression • Irony: more dead load strengthens a traditional masonry arch.

  11. Puzzle • This arch is indeterminate, yet you can solve it. Why?

  12. Puzzle • This arch is indeterminate, yet you can solve it. Why? • It is funicular. M=0, everywhere. So…

  13. Puzzle • This arch is indeterminate, yet you can solve it. Why? • It is funicular. M=0, everywhere. So… You can place pins wherever you want them, to facilitate analysis.

  14. Puzzle • This arch is indeterminate, yet you can solve it. Why? • It is funicular. M=0, everywhere. So… You can place pins wherever you want them, to facilitate analysis.

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