The Ben Franklin Bridge is primarily constructed from steel, a robust and enduring material essential for its iconic suspension design and structural integrity.
The Foundation of Steel
From its initial construction, steel was the cornerstone material for the Ben Franklin Bridge. This choice reflects the material's immense strength, durability, and flexibility, which are critical for supporting the substantial weight and forces exerted on a major suspension bridge connecting Philadelphia, Pennsylvania, and Camden, New Jersey.
Original Construction Materials
The bridge's original framework, completed in 1926, required an extraordinary amount of steel to form its towers, cables, and deck structure. The initial construction utilized 70,851 tons of steel, providing the robust backbone for what was, at the time of its completion, one of the world's longest suspension bridges.
Subsequent Structural Additions
Decades after its opening, the bridge underwent modifications to enhance its capacity and functionality. These upgrades further underscored steel's vital role in its ongoing evolution. In 1951, additional roadway lanes were created by converting areas originally reserved for streetcar or trolley operations. This significant modification necessitated the incorporation of an additional 6,500 tons of structural steel to accommodate the wider vehicular traffic.
Total Major Steel Utilized
The combined total of steel integrated into the Ben Franklin Bridge highlights the remarkable scale of its construction and subsequent enhancements:
| Phase of Construction | Steel Quantity (Tons) |
|---|---|
| Original Construction | 70,851 |
| 1951 Roadway Expansion | 6,500 |
| Total Major Steel | 77,351 |
While steel forms the primary structural material, like all large infrastructure projects, the Ben Franklin Bridge also incorporates other materials such as concrete for its massive anchorages and piers, and various surfacing materials for its roadways. However, steel remains the dominant element defining its structural prowess and historical significance. For more information about the bridge, you can visit the Delaware River Port Authority website.
