How many inches of bearing are required for the ends of beams or girders supported on masonry or concrete?

The correct answer is determined by referencing building codes and engineering standards that specify the minimum end bearing requirements for beams or girders supported on masonry or concrete. In most building codes, a minimum bearing of 3 inches is mandated for wood beams and girders. This requirement is put in place to ensure adequate support and load transfer to the masonry or concrete substrates, preventing potential structural failures.

The rationale behind this requirement includes considerations for safety, stability, and the ability to accommodate the expected loads that the beams and girders will carry. Insufficient bearing can lead to inadequate support, resulting in flexural failure or undue stress on the materials, which can compromise the structural integrity of the building.

Adhering to this standard is essential in commercial building construction not only for compliance with codes but also for the safety of occupants and the longevity of the structure. Thus, 3 inches of bearing is necessary to meet these requirements effectively.