• Modeling a Structure with Wall shear

    Hello, I hope you are very well. 1. Why when I make models with walls (modeled with plates) and I do a spectral modal analysis with the IS1893 2002 standard, the participating mass of the modes does not reach 90% quickly, I have to place about 200 modes…
  • 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…
  • No uplift while doing Response Spectrum Analysis

    While analyzing a structure for response spectrum seismic loading the response(base reactions, member end forces, etc.), comes to be in absolute value. This is due to the fact that the responses coming out of several modes are combined by using some predefined…
  • How to account for the damping effects of springs when performing a dynamic analysis

    Applies To Product(s): STAAD.Pro Version(s): All Environment: N/A Area: Analysis Solutions Subarea: Dynamic Analysis Original Author: Phil Riegel, Bentley Technical…
  • Modal Analysis Mass Distribution Uniformly along the length of member

    Is there an option in Staad to not lump the mass on nodes for Modal analysis and instead distribute the mass (like uniformly distributed load) along the length? This could be important as it may affect member design for response spectrum analysis. For…
  • What is the reason for designing of column without considering the worst load case even though I add several load combinations?

    In my model I analyze and design a G+8 RCC Structure, and the column is designed for only the first load case even though other load combinations give maximum axial force and moments. I attached the screenshots of output file below.
  • 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…
  • Torsional provision Consideration in IS 1893 (Part-1) 2016 Response Spectrum Analysis

    Applies To Product(s): STAAD.Pro Version(s): All Environment: N/A Area: STAAD.Pro Analysis Solution Subarea: Response Spectrum Analysis Original Author: SANJIB DAS,…
  • related to member fail in response spectrum analysis

    staad file with EQ analysis.rar I am designing a G+2 building but am unable to remove warnings. you can see the file I attached. if I am wrong please try to provide the sample file of response spectrum analysis file for reference.
  • How Multiplying factor Vb/VB is taken into consideration in STAAD for IS1893 2016 code?

    Applies To Product(s): STAAD.Pro Version(s): All Environment: N/A Area: STAAD.Pro Analysis Solution Subarea: Response Spectrum Analysis Original Author: Abhisek Mandal…
  • Vertical component of seismic load - NBCC

    Dear All, I am trying to consider vertical component of seismic load using National building code of Canada NBCC. I assume 70% of acceleration is vertical direction (see below), but I am getting errors. I would appreciate if you tell me where is the…
  • PDELTA ANALYSIS WITH RESPONSE SPECTRUM LOAD CASE

    STAAD SPACE START JOB INFORMATION ENGINEER DATE 23-Aug-21 END JOB INFORMATION INPUT WIDTH 79 UNIT METER KN JOINT COORDINATES 1 0 17.2667 0; 2 2.59808 17.2667 -1.5; 3 0 17.2667 -3; 4 -2.59808 17.2667 -1.5; 5 -2.59808 17.2667 1.5; 6 0 17.2667 3; 7 2.59808…
  • how can i eliminate this warning **WARNING: TENSION/COMPRESSION REQUESTED IN SAME RUN THAT INCLUDES A DYNAMIC ANALYSIS. and even after considering the Z direction in Response spectrum analysis i am not getting Z direction values

    PEB.RESPONSE SPECTRUM ANALYSIS.std
  • How to apply sequence of loading for elevated water tank resting on sloping ground by using Response spectrum analysis?

    Hello.sir i m comparative study of elevated water tank resting on sloping ground & take slope varies from 0 to upto 30degree..I have dout in staad model.. actually I already model but my result not getting correct..means as per our study base shear will…
  • 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…
  • Response Spectrum

    How to reference to the mass load can be done in physical model with respect to Response Spectra Loads?
  • Warning when applying Response Spectrum Analysis

    Hello Experts, While analyzing the model by response spectrum analysis, I do receive the following warning while specifying seismic direction as "Y". ***WARNING : EARTHQUAKE MODE IS NOT AVAILABLE FOR X AND Z DIRECTIONS **** Whether this can be neglected…
  • Response Spectrum Analysis as per Eurocode

    Hello Experts, I am not well versed with the dynamic analysis, since we could not perform linear static analysis for seismic load application as per Eurocode, Someone please guide me how to apply the response spectrum properly as per Eurocode. I tried…
  • Dynamic Response Spectrum Inputs not affecting natural frequency results

    I am attempting to find the natural frequency of my staircase model as shown below using the total weight of the structure distributed evenly over every node as a nodal mass in the Ty direction. My issue is, I am able to get a frequency running the dynamic…
  • 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…
  • Very Low Base Shear and Sign to be used for Loads

    Dear All, I hope you are all doing well. I am in the middle of a crucial assignment for which I am doing Response Spectrum analysis using custom spectrum. Base Shear and load sign.txt Seismic Spectrum.xlsx Client has provided the Ct and x values…
  • 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
  • Unrealistic Deformation on Rigid Diaphragm in Ram SS

    Hi, I am currently modelling a 4 story concrete building with a single core with two levels of basement. I am trying to run the spectral analysis using AS1170.4 and I have set all my floor diaphragms to rigid diaphragm. The model dissipation for each…
  • STAAD.PRO CONNECTION Need help to solve: "Error: External component has thrown an exception".

    Hello, good afternoon! The company I work for have recently installed the Staad.Pro CONNECTION V.22.02.00.26 in my PC, but it's not working well. For Analytical models or Building models, it works normally, but whenever I try to create or open a…