Tubular support beam with self-draining surface

A method of manufacturing a tubular support beam for minimizing contamination from pooled water, comprising:

• forming a first channel by joining a first channel side wall to a first channel bottom wall at a substantially ninety degree (90°) angle and joining a first channel top wall to the first channel side wall at a first interior angle greater than ninety degrees (90°) and less than one hundred twenty five degrees (125°);
• forming a second channel by joining a second channel side wall to a second channel bottom wall at a substantially ninety degree (90°) angle and joining a second channel top wall to the second channel side wall at a second interior angle greater than ninety degrees (90°) and less than one hundred twenty five degrees (125°);
• forming a first weld joint joining the first channel top wall and the second channel top wall;
• and
• forming a second weld joint within a root gap between the first channel bottom wall and the second channel bottom wall.

A load-carrying structure comprising:

• at least one tubular support beam comprising:
• a first channel having at least a first channel side wall and a first channel bottom wall, wherein a first lengthwise edge of the first channel side wall is contiguous with and forms a substantially 90° interior angle with a first lengthwise edge of the first channel bottom wall;
• a second channel having at least a second channel side wall and a second channel bottom wall, wherein a first lengthwise edge of the second channel side wall is contiguous with and forms a substantially 90° interior angle with a first lengthwise edge of the second channel bottom wall;
• at least one of the first channel or the second channel comprising a top wall, wherein a first lengthwise edge of the top wall is contiguous with and forms an interior angle greater than 90° with either a second lengthwise edge of the first channel side wall or a second lengthwise edge of the second channel side wall;
• a first weld joint to join the first channel and the second channel at a second lengthwise edge of the top wall of the first channel or the second channel, wherein a second lengthwise edge of the first channel bottom wall is aligned with a second lengthwise edge of the second channel bottom wall and separated by a root gap;
• and
• a second weld joint formed within the root gap to join the second lengthwise edge of the first channel bottom wall to the second lengthwise edge of the second channel bottom wall, forming a tubular support beam;
• at least one receiving member having notched openings in a first side configured to receive the top wall of the tubular support beam;
• and
• at least one support leg coupled substantially perpendicular to the first channel bottom wall and the second channel bottom wall of the tubular support beam.