In London, steel structures are often used for bridges and boat terminals. I admire the authorities who maintain so well!
In our country, steel is not often used due to higher cost and difficult maintenance under humid tropical climate. Rusting is the main problem as can be seen in this steel structure. The structure lost its shine after a while. Painting normally lasts a few years depending on the quality of paints and workmanship. After that, nobody bothers about it until the structure starts to fail.
We do not have a habit to allow cost for maintenance and think that any structure, once built, will last forever!
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