| 摘要 |
PROBLEM TO BE SOLVED: To contrive the improvement of a function by setting the thickness of the constitution material of a floor large beam so that the primary natural frequency of a floor is specific, and making the size of each part of the floor large beam specific. SOLUTION: The thickness of the constitution material of a floor large beam 12 is adjusted so that the primary natural frequency of a floor is 25 Hz or Larger of the minimum limit level or 30 Hz or larger of a margin level, Next, the beam i2 is formed into a C-shaped cross section with a lip, when beam depth is 250 mm±10%, flange width 80 mm±10%, lip length 50 mm±10% longitudinal length 3600 mm±10% and short hand direction Length 2400 mm±10%, the minimum limit level of the primary natural frequency of the floor is 25 Hz or larger as the thickness of the constitution material of the beam 12 is 2.3 mm or thicker in the longitudinal direction and 1.6 mm or thicker in the short hand direction, or the margin level of the primary natural frequency of the floor is 30 Hz or larger as the thickness of the constitution material of the beam 12 is 6.0 mm or thicker in the longitudinal direction and 4.0 mm or thicker in the short hand direction. Therefore high rigidity, high sound insulation and low vibration of the floor are contrived by simple constitution, and discomfort feeling due to the fluctuation of the floor can be cleared.
|
