• Rhythmic Activity on Floors in RAM Concept

    I have previously used RAM Concept to analyze slabs for footfall vibration criteria. Is there a guide to using RAM Concept to analyze slabs for rhythmic group loads such as aerobics, dancing, jumping exercises, etc? The slab is a flat plate concrete slab…

  • Vibration Analysis for Impulse Weight Drop

    Hello Is it possible to perform vibration analysis for an impulse weight drop? For example, I have a loading dock on an elevated mild slab. The vibration consultant is suggesting we perform a FEM analysis for vibration transmission from a weight drop…

  • Ram Concept Vibration Analysis - Weight of Person

    I'm analyzing an elevated concrete slab for vibration in Ram Concept. The results for my model appear to be heavily dependent on the "Weight of Person", so I'd like to use a good practical number for this setting. The default weight is 200 pounds. I…

  • Ram Structural System - FloorVibe stuck on "Preparing to install..."

    I am running what appears to be the latest Ram Structural System 17.01.01.05. When I try to run Vibration >> AISC Design Guide #11, and the click on a beam to run the FloorVibe, It then gets stuck on "Preparing to install..." indefinitely. Any…

  • Can RAM Elements be used for vibration analysis of stairs?

    I have a stair that I'm concerned may be susceptible to vibrational issues. 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…

  • Vibration frequency

    good day, how to determine that the frequency given by Staad is safe?

  • Vibration analysis in Ram Concept

    Hi all, I have two questions about vibration analysis using RAM Concept. How can I know whether the vibration analysis is performed on a "cracked" or "uncracked" models. And also, do I have control over that? I ask this question because I am doing…

  • SFA Rotational Speed of Vibrating Machine

    Please, I need to know if there is a speed limit of vibrating machine that can analyze SFA (v 7.20) considering that Figures 3.9 and 3.11 of ACI 351.3R-04 have a frequency limit of 10000 rpm. Can the SFA design the foundation of a vibrating machine operating…

  • Vibration/machine loads

    Hello, How do I include dynamic loads in the basic load cases of STAAD? For example, the vendor data I have for it are the dynamic load in LBS and the vibration frequency in RPM. Thanks, Sue

  • RE: STAAD FRF (Frequency Response Function)

    STAAD.Pro can do a floor vibration analysis as per Design guide 11. The software can calculate the frequencies for the joist and girder panel modes and find out the frequencies for the combined mode. Eventually the peak acceleration due walking excitation…

  • RE: Ram concept modal mass in Vibration analysis

    Unfortunately, while we are calculating the modal mass (mass participation) of each vibration mode they are not stored or exposed to the user currently. I added an enhancement request (#494917) to make those values available.

  • RE: RAM Concept - Vibration Analysis Questions

    1. Yes, both the superimposed dead load and live load should be modeled on Additional Mass Loading. 2. The frequency for each mode can be reviewed using Layers - Vibrations - Vibration Analysis - Tables - Vibration Frequencies. 3. The Excitation Response…

  • How to carry out vibrational analysis of foundation in stadd.pro?

    I am a post graduate student of structural engineering. I am taking a dissertation topic on Machine Foundation. I want to carry out dynamic analysis of foundation on stadd.pro. Please help me. Thank You

  • RE: Ram Concept Vibration Analysis

    Regarding the other points in your posts ... The vibration analysis in RAM Concept is based on the methods documented in the reference below: [Willford, M.R. and Young, P., “A Design Guide for Footfall Induced Vibration of Structures”, Concrete …

  • Ram Concept Vibration Analysis

    I am working on a hospital project with MRIs and Surgery. The vibration requirements we were given for the MRI is a maximum of 500mips. The slab is 13" thick PT slab on a 28'-0" by 32'-0" bay. The bays are consistent across the entire building. I ran…

  • RE: Assigning a natural frequency limits to composite beams (RAM steel)

    When we have items in the criteria menu they always apply to the whole model. Only options under the Assign menu can be delegated to particular members. See this about FloorVibe: It sounds like you need to install it, or get up to the latest RAM SS…

  • RAM Concept - Vibration Analysis - Number of modes??

    In RAM Concept i want to estimate the RMS / Peak Foot Fall Velocity in Vibration Analysis. While doing this we have to set the number of Modes in the Vibration input page. Advice me how to choose the number of modes. Since the velocity value differed…

  • RE: Floor Vibration Analysis

    Some programs (like Ram Concept) actually perform a dynamic analysis of a floor structure to check vibration , but in RAM Structural System, the only alternative to the AISC Design Guide 11 - bay method is the "Original Method" which is like a single…

  • StaadPro; I should like to determine the Response Factor to footfall for a Composite Floor - where to start?

    Hello We have to determine the Response Factor for a composite floor. I would like to model in the composite floor and analyse using Staad Pro to determine the Modal Mass (M) so that I can use it in the equations for rms acceleration to determine…
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