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  • Dynamic superelement

    Hello SACS community I am working on offshore wind turbine foundation analysis As a part of the project, I need to submit dynamic superelement data of the foundation to the turbine manufacturer. So I have gone through the dynamic superelement SACS…
  • Equivalent Statist Load Generation EQKLOD

    Hi, I am running a seismic analysis and am generating earthquake equivalent loads for pile foundation check. As per SACS-Dynamic Response manual, if we set “ Reversed Option ” on “ Both ”, SACS generates equivalent loads for 20 directions (every 18…
  • Seismic Complete Quadratic Combination Force Summations

    Introduction You may have seen that the Dynamic Response force summations don’t match the Combined force summations in a seismic analysis. In this post I will describe why that is and show you how to replicate this in your own analyses. If we look…
  • Time History Analysis

    Greetings, As understand from the SACS Help manual, while running time history analysis, one can define 3 time history function in one file. I have few questions on this analysis as below, 1) How to decide the Directionality Factors? As per help…
  • Can SACS be used for dynamic analysis of a centrifugal compressor located in a PAU.

    Can SACS be used for dynamic analysis of a centrifugal compressor located in a PAU. PAU been design using STAAD Pro? What module of SACS I need to use and are there any step I need to carry out the work. I have used SACS before but not for dynamic…
  • Using SACS Dynamic Response for Machine Vibration Analysis

    Hi Sirs, I'm using SACS Dynamic Response for Machine Vibration Analysis (for two reciprocating pumps running simultaneously). There are two rotating parts on the pump which are motor and pump (cylinders+plungers). I have created a base frame of the pumps…
  • Wind Spectral Analysis - Aerodynamic Admittance

    Dear Bentley Staffs, I am curious about the wind spectral analysis concept using in SACS. In general, we should have Aerodynamic Admittance which is taken into account effect of gust disturbance due to the size of structure. However, I did not see…
  • SACS Extreme Wind Analysis - Spectral Response Combination

    Dear Bentley Staffs, I found something strange about the extreme wind analysis executed by SACS. Sample 12 provided an example of extreme wind analysis by using spectral approach and automatic combined the wind extreme value with static result. …
  • Spectral Wind Fatigue

    Hai, I have run the analysis for Spectral wind fatigue. But there are error occur during analysis. This is my dynamic response input file Can someone help me on this.
  • How to generate a wave timeseries (Jonswap) in Sacs?

    Dear All, Can somebody help me with creating and analysing a random wave signal from a JONSWAP spectrum in SACS. For this project a WTG foundation is to be designed. We would like to investigateif SACS is the software to be used for this. Preferably…
  • RE: Fatigue Analysis Force-Time history

    Younghoon, I would recommend generating a postvue database from the dynamic response common solution file using the Post Processing - Generate Postvue Database analysis. Here is the workflow: Post Processing - Generate Postvue Database Input…
  • Dynamic Analysis in SACS

    Hello, Is it possible to perform dynamic analysis in SACS by applying RAOs , seastate (wave period, wave height), drag coefficient with load cases on a structure connected to a ship and after the analysis to check the stress in the members of the structure…
  • RE: dropped object analysis in SACS

    From Section 1.3.3 of the Dynamic Response manual: The Dynamic Response module can predict the response of structure resulting from an impact from a vessel or a dropped object. The process can also account for fluid damping for a submerged portion…
  • RE: Wind Spectra

    Hoan, There isn't an easy answer to that question since the answer depends upon your analysis. The wind speeds you define in your wind data are used to calculate the fatigue damage based upon the distribution you have input in the dynamic response input…
  • RE: Wind Spectra

    Kasiphon, I don't believe that any standard deviation of the wind velocity is used in our calculations. We use a weibull distribution for the wind spectra and the user inputs the k and a parameters to determine the shape and magnitude of the distribution…
  • RE: Wind Spectra

    HoanW., The Harris Spectra that you refer to is actually referred to as the Von Karman spectrum in SACS. When SACS is referring to the Harris spectrum it is the Davenport version of the Spectrum referenced in 3.4 of the Dynamic Response manual. …
  • RE: spectral analysis with dynamic response module

    SACS uses SRSS to combine modal responses to spectral loading. Refer to Section 3.1.3 of the Dynamic Response manual for more information.
  • SACS Motion Analysis for Tow

    Hello! I am analyzing a Jack Up Rig with a single column for wet tow. During wet tow, the jack-up will be floating on its hull and the column will be above water. The procedure I have adopted is as follows: 1. Perform a wave dynamic analysis in SACS…