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  2. Construction of One World Trade Center - Wikipedia

    en.wikipedia.org/wiki/Construction_of_One_World...

    Each steel column, made at a factory in Luxembourg, was about 60 feet (18 m) long. The columns at the bottom of the tower's foundation were about 35 feet (11 m) long. [27] By November 1, 2009, the twenty-four perimeter columns of 1 WTC were all erected, and construction of the second floor (the first floor above ground level) was nearly complete.

  3. Construction of the World Trade Center - Wikipedia

    en.wikipedia.org/wiki/Construction_of_the_World...

    A grid of lightweight bridging trusses and main trusses supported the floors. The trusses had a span of 60 feet (18 m) in the long-span areas and 35 feet (11 m) in the short span area. [113] The trusses connected to the perimeter at alternate columns, and were on 6-foot-8-inch (2.03 m) centers.

  4. Open web steel joist - Wikipedia

    en.wikipedia.org/wiki/Open_web_steel_joist

    They are designed as simple spans supporting equally spaced concentrated loads for a floor or roof system. These concentrated loads are considered to act at the panel points of the Joist Girders. These members have been standardized for depths from 20 to 120 inches (510 to 3,050 mm), and spans to 120 feet (37,000 mm).

  5. Staggered truss system - Wikipedia

    en.wikipedia.org/wiki/Staggered_truss_system

    The staggered truss structural system consists of story-high steel trusses placed on alternating column lines on each floor so that the long axis of one truss is always between the trusses on the floor below. [4] The system staggers trusses on a 12’ module, meaning that on any given floor the trusses were 24’ apart. [2]

  6. Bailey bridge - Wikipedia

    en.wikipedia.org/wiki/Bailey_bridge

    The floor of the bridge consists of a number of 19-foot-wide (5.8 m) transoms that run across the bridge, with 10-foot-long (3.0 m) stringers running between them, and over the top of the transoms, forming a square. [3] Transoms rest on the lower chord of the panels, and clamps hold them together.

  7. Flitch beam - Wikipedia

    en.wikipedia.org/wiki/Flitch_beam

    An 1883 article from The American Architect and Building News compares three alternatives in a hypothetical railway station "in which the second story is devoted to offices, and where we must use girders to support the second floor of 25-foot span, and not less than 12 feet on centres if we can avoid it.

  8. The current price of Dollar Tree's products may increase again because of President-elect Donald Trump’s tariff plans, Dollar Tree executives said. Apart from increased prices, the discount ...

  9. I-joist - Wikipedia

    en.wikipedia.org/wiki/I-joist

    Depths can range from 9 + 1 ⁄ 4 to 24 inches (230–610 mm) and reach up to 80 feet (24 m) in length, although 40 to 42 feet (12–13 m) is more common. The intended use for an I-joist is for floor and roof joists, wall studs, and roof rafters in both residential and commercial construction.

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