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It depends on the material and surface finish you choose.
May you choose aluminum, steel or wood? All of these material have their own particularities. Steel need constant maintenance which will increase ownership costs over time while aluminum may cost about 10% more at time of purchase but will not need maintenance at all.
For example, you may pay 75$/ft^2 for a steel footbridge but you'll have to add periodic investment to paint and maintain a steel bridge. An aluminum bridge initial costs will be about the same as a Cor-ten steel bridge but will not deteriorate over time (Weathering steel will).
For example, the average annual metal corrosion rates after long-term exposure to deicing salts with 78% relative humidity, a temparature of 70F will be in mils/year:
1) Aluminum 0.77
2) Weathering steel 31.89
3) Unprotected carbon steel 86.22
references:
http://www.maadigroup.com/lang/en/maadi-group-adds-builddesign-pedestrian-and-bicycle-bridges-to-its-specialties
http://www.imoa.info/_files/pdf/DeicingSalt.pdf
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∙ 13y ago
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