I know Elements can determine mode shapes via eigenvalue analysis, but what about the natural frequency? Any guidance on feasibility and/or ways to translate the procedures in the design guide to comparable inputs in Elements would be much appreciated. I've often used RAM Elements to model a variety of stair configurations under gravity loads and ELF seismic loading, but can it also be used to check for vibration? Most of the information I'm finding online references using SAP to find the natural frequency for use in the AISC DG11 procedures, but DG11 also says that "several commercially available programs provide convenient features for computing the FRF magnitude". Sections 1.18.3, 5.31.4 and 5.32.10.2 of the STAAD.Pro Technical Reference ManualĮxample problem 22 of the STAAD.Pro Examples Manual for type (a)Įxample problem 16 of the STAAD.I have a stair that I'm concerned may be susceptible to vibrational issues. The force values and the time at which they act have to be specified in this case.ĭetails on both types on available in the following places :
will have to be obtained by the user, and specified as input to STAAD.ī) Random vibration which can be described in the form of discrete time-force pairs. Input data in the form of the peak amplitude, operating frequency of the equipment, number of cycles, phase angle, etc. In order to analyze a structure for dynamic loading which does not fall under the category of ground motion (earthquakes), no matter what the origin of the dynamic loading, it will have to be reduced to one of two types that STAAD can recognize :Ī) Harmonic loading : This requires that the load be described in the form of a Sine or Cosine function. I could not find in Technical Reference as well as online manual.
I was wondering if STAAD can take into account the vibration loads coming from Blowers. For one of our projects we are designing a platform sitting on steel framing.
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