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Recent content by Lugo331

  1. Lugo331

    DESIGN STANDARDS FOR TRAILER STRUCTURES

    If we were mounting a component like a diesel motor we would design all the supports, fasteners, weld joints, etc. for twice the actual weight. This would account for bumps, pot holes, and emergency stopping. Paul
  2. Lugo331

    DESIGN STANDARDS FOR TRAILER STRUCTURES

    In the oil field industry we used a rule of thumb of twice the calculated static stress to allow for dynamic loading. Paul
  3. Lugo331

    Need Help Calculating Section Modulus

    I am working on two beam comparisons. The first is a "C" channel shape, 16" tall, 4" flange, 3" return, and .250 wall thickness. The second beam is fabricated from structural steel tubing 5 x 3 x .188 with the 5" leg being vertical on the top and the bottom. The distance between the upper and...
  4. Lugo331

    DESIGN STANDARDS FOR TRAILER STRUCTURES

    You can start with the Department of Transportation federal regulations. They have all the regulations on length, width, height, and weight. Going from memory but basically:65 ft combined truck and trailer, 102" wide max, 13'-6" max height, 80,000 LBS max combined weight, 34,000 max on each of...
  5. Lugo331

    Section Modulus Help

    I'm not sure if I selected the right forum. I need help calculating the section modulus of a couple different shapes. The first is a formed "C" channel: the vertical side is 16" tall, the horizontal flange is 4" top and bottom, with a vertical return of 3 3/4" top and bottom, and the material...

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