| 摘要 |
A structural main beam for use in the supporting lattice or grid of a fire rated suspended ceiling comprising a longitudinally extending web having bulb and flange portions located along opposite upper and lower marginal edges thereof, and including coupling means at opposite longitudinal ends for expandably interlocking a pair of beams in end to end relationship. Thermal expansion of the beam is localized in the interlocking coupling means and in at least one deformable section formed by a pair of vertically oriented apertures or cut outs in the web, the apertures being disposed proximate each of the bulb and flange portions respectively to permit bending thereof whereby the integrity of the ceiling is substantially maintained when subjected to extremely high thermal stresses such as can occur during exposure to a fire.
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