• Response Spectrum Analysis & Design Forces Problem for Shear Wall Design in RCDC

    Hi everyone, I have faced a problem importing analysis forces from Staad Pro to RCDC for a shear wall example. I have performed seismic analysis by using the response spectrum method for a box-shaped and cantilever shear wall in StaadPro. I can determine…
  • Staad.PRO Seismic Response Spectrum (CQC)

    Hi. I am working on a steel structure and i have some issues with the seismic loads. That are the flexure MZ diagrams for the pure seismic load case in X direction (longitudinal). It caught my attention the results for the beam element marked in…
  • Inherent and Accidental Torsion for Custom Response Spectrum (Site-Specific RSA)

    Attached below is the Response Spectra Window for ASCE code in STAAD. It shows that torsional effects may be included by setting the parameters for the dynamic (DEC) and accidental (ECC) eccentricity. However, this feature is not present if Custom…
  • RAM Frame Dynamic Analysis Criteria

    When performing a dynamic analysis for Response Spectrum in Ram Frame, is it correct to check the reduced stiffness for steel members in the criteria? I have a situation where I need to scale up my dynamic loads to achieve the 0.85*ELF forces. The question…
  • Help with Custom Response Spectrum

    Good day, I'm new to STAAD.Pro and I've been practicing the most basic commands, but when I tried to add seismic definitions, I realize there are not seismic parameters from my country (Peru-E030). I would like to add new custom parameters, but I can…
  • Factor in X & Z direction and Scale factor for SRSS

    Hello Bentley support, I am working on a steel structure (Portal Reclaimer) which need to be designed in accordance to BNBC (Bangladesh Code). Can you please suggest how to assign parameter for SRSS response spectrum. However it is very similar…
  • Response Spectrum as per AIJ

    Hi Guys, I just want to know if STAAD supports response spectrum as per AIJ? The only option I have is to use Custom Spectrum Table but the problem is its very had to find Hazard Maps for Japan. Thank you.
  • Site Specific Design Response Spectrum (RAM Frame)

    I've received a site specific spectral acceleration plot from the Geotechnical Engineer. How do I apply this plot with the inputs for RAM Frame? Do I calc the site specific acceleration based on RAM's calculation of the period and compare this to the…
  • TENSION MEMBER ONLY (RESPONSE SPECTRUM),

    is it possible to analyze with Staad for REPEAT LOAD as it is not possible to do with Load Combination?
  • RESPONSE SPECTRUM MODAL ANALYSIS

    Good morning, I'm trying to perform response spectrum modal analysis with Response spectrum user define data option on a multistory concrete building. The porpoise is to introduce in the FE model, seismic actions according to Italian design code (NTC2018…
  • RAM Frame - IS 1893:2016 Response Spectra Analysis Scale Factor

    Could someone please confirm that scaling the Response Sectra Analysis generated in RAM Frame using the Indian Standard IS 1893:2016 code does not include an adjustment for the Zone Factor, Z? If this is the case, I would assume the scale factor should…
  • Error no unsupported masses entered - check densities in seismic definition

    Dear all, Error found during the seismic definition analysis. Found the error "no unsupported masses found - check densities" . Kindly help me out from this . COLLEGE PROKECT.STD
  • ACCERLERATION SCALE FACTOR IN RESPONCE SPECTRUM ANALYSIS

    N. SUBRAMANIAM BOOK OF RCC DESIGN GAVE THIS SYNTEX *SCALE FACTOR = (0.16/2) × (1.5 / 5) = 0.024 SPECTRUM CQC 1893 X 2.078 ACC SCALE 0.024 DAMP 0.05 MIS SOIL TYPE 2 IN THIS CASE ACC SCALE VALUE IS CALCULATED USING Z/2*I/R BUT IN STAAD HELP CONTENT…
  • Seismic analysis EC8

    Hi guys, I' m trying to make a seismic analysis, using the response spectrum (EC8) from the "load item" list. In the second phase I' m define one spectrum in x and y direction (direction parameters 1 and 0,3), specifying the masses (selfweight, live…
  • Como obtener periodo de vibración para cada dirección X, Y y Z

    Saludos a todos, en México se ha modificado el análisis por sismo, me piden realizar la comprobación del cortante basal en cada dirección ortogonal, mínimo en 2 direcciones (X y Z), así como la verificación del estado límite de servicio para sismos frecuentes…
  • "RAM Structural System" modal analysis load combinations

    Hi, I am working on RAM Structural System. I looking to do a modal analysis on the building. Is there a way automatically generating the load combination for modal analysis? The way RAM does for direct analysis method? Or do I have to manually…
  • Response Spectrum_Eurocode 8

    I have an issue with the response spectrum mass source definition in Eurocode 8 I have 4 load cases considering earthquake forces in (X, -X, Z, & -Z) directions. I define the mass source for the response spectrum calculations as per the following…
  • RE: MAT PLATE Y, Base Pressure, Displacement

    I answered this question in my post Talking specifically of your model, the load combination case 106 includes couple of response spectrum load cases 1 and 2. For cases like these, the displacements ( and all other response quantities ) are devoid…
  • RE: Spectrum Load Case, Base pressure

    Owing to the very nature of response spectrum analysis, the response quantities like displacements, support reactions, base pressure etc. are all positive. Since the signs are lost, it is not possible to determine whether a node is moving up or down by…
  • RE: Accidental torsional moment vs. natural torsional moment staad

    This is commonly referred to as the direction factor and is basically a factor that is applied on the input spectrum data, in addition to the scale factor. A factor of 1 would mean that the spectrum values you have input, after being multiplied by the…
  • RE: RESPONSE SPECTRUM DOUBTS

    David : Here are the responses to your queries 1. The selfweight has to be applied in ALL directions because from these weights the software will calculate the masses which can vibrate in all 3 directions when subjected to the response spectrum loading…
  • RESPONSE SPECTRUM DOUBTS

    HI. I'M DAVID LINARES FROM VENEZUELA. I'M A CIVIL ENGINEER. I'VE BEEN USING STAAD PRO FOR ALMOST 1 YEAR. I HAVE DOUBTS WHEN IT COMES ON SEISMICS LOADS. I'M GOING TO ADD A SIMPLE EXERCISE HERE OF WHAT I DO WHEN I DESIGN ANY STRUCTURE. I WILL ADD SOME…
  • RE: Seismic Analysis of Boiler Support Structure - Find local structural accelerations

    You are welcome. X1 X2 X3 represent the translational accelerations in global X, Y and Z directions and are reported in terms of g values. X4 X5 X6 represent rotational accelerations about global X, Y and Z and are reported in rad/sec2.
  • Scale Factor -Responses Spectrum

    As I refer to Application Examples U.k. No 11 Response spectrum analysis of a frame. The response spectrum was define as below: SPECTRUM CQC X 1.0 ACC DAMP 0.05 SCALE 9.806 0.03 1.00 ; 0.05 1.35 0.1 1.95 ; 0.2 2.80 0.5 2.80 ; 1.0 1.60 Notes: The…
  • RE: IBC Response Spectrum Analysis -- Reaction Question

    There is no problem with the way you have set up the model. The modal combination methods used for combining the results from the various modes in a response spectrum analysis, leads to all positive numbers. This is explained in the following post http…