Overview
With the increased use of lighter beam sizes and longer spans made possible by higher steel and material strengths and with larger, more open and more lightly load floor areas due to advances in office technology and utilization, the lighter sleeker floor systems are more susceptible to adverse vibrations than ever before. It is vital that this serviceability condition be investigated and considered during design. Three distinct methodologies have been incorporated into the RAM Structural System.
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A methodology has been implemented based on Steel Design Guide #11, "Vibrations of Steel-Framed Structural Systems Due to Human Activity", 2nd Edition, authored by Thomas Murray, David Allen, Eric Unger, and Brad Davis, and published by AISC. It is described in greater detail herein. A working understanding of the Design Guide is important when using this feature. This feature is described in Section 11.2. It is invoked using the command |
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A methodology has been implemented based on SCI Publication P354, "Design of Floors for Vibration: A New Approach". It is described in greater detail herein. A working understanding of the Publication is important when using this feature. This feature is described in Section 11.3. It is invoked using the command |
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A traditional methodology has been implemented that is based on the Modified Reiher-Meister scale and on the work of Dr. Thomas Murray published by AISC nearly 30 years ago. However, due to the advances mentioned previously, that methodology no longer adequately predicts the actual vibrational behavior of modern floors. In fact, AISC recommends that this methodology no longer be used. This methodology is retained in the program, for reference or comparison purposes, and is described in Section 11.4. It is invoked using the command. |
A simplified method commonly used in the UK is also available when BS 5950 is selected as the design code. It is described in Section 11.5.