Using arch supports or adding a central pier can significantly reduce the amount of steel needed for long spans, though these options have their own fixed costs. 2. Advanced Material Selection
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While more expensive per unit than carbon steel, it is much stronger. For members under high stress, using smaller high-strength steel bars is often cheaper than using massive carbon steel beams. Using arch supports or adding a central pier
The 2016 edition was the final desktop version before the software moved to a web-based Cloud Edition. You can currently download the installer for both Windows and Mac: While more expensive per unit than carbon steel,
Lowering the bridge deck often shortens the span, reducing the bridge cost. However, this increases "site costs" due to excavation. The cheapest overall design is a balance between these two.
Use hollow tubes for compression members (to prevent buckling) and solid bars for tension members.