• Reference loads forming mass model

    I'm getting the following warnings in the output file, version 22.08.00.175: *** NOTE: NEITHER "MASS" NOR "GRAVITY" REFERENCE LOADTYPE IS PRESENT. MASS MODEL IS FORMED BY COMBINING ALL "DEAD" AND "LIVE" (IF ANY) REFERENCE LOADTYPES. *** NOTE: MASS MODEL…
  • What does the mass density and frequency scale mean??

    Hello, I am doing a dynamic analysis of an experimental work which include couple of lines I could not understand . Any one can explain what does those highlighted parts in the attached image mean?
  • 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…
  • Dynamic Analysis- Capping Fundamental Periods

    I'm analyzing a structure with a dynamic analysis in RAM Structural System and notice that the fundamental periods are not being capped at CuTa per 12.9.1.4.1 of ASCE 7-16 when calculating the mass participation. Is there a reason for this? I don't see…
  • Controlling Fundamental Building Period

    I am running the seismic analysis for a 3 story structure and have questions about how to determine the appropriate building period to use for the seismic analysis. Gravity system is typical steel frame, with composite slab/framing at 2nd and 3rd Floors…
  • Dynamic Analysis

    Dear sir/admin, I have few questions that I really need to know. 1. Why we dont apply uniform member load in dynamic analysis? 2. It seems we are only providing floor load, does it mean that we have to convert member load to equivalent floor load…
  • 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…
  • Modal Frequency Calculation output details

    Good day, everyone! My query is about using the Modal Frequency Calculation... I've been checking the modal frequency of the structure as a whole but the client asked how we deal with the concentrated loads in the middle of the beams. I said that…
  • Dynamic Analysis

    Hi. I would like to know the fastest & simplest way to extract displacement vs time graph and velocity vs time graph data in text file or excel file format. It is time consuming for me to extract data one by one (x,y and z direction) when working with…
  • Dynamic Analysis

    Good day Sir, I just want to ask if my output/result is normal. The total base shear in x-direction is two times of z-direction. Is this normal? I always do static so I am not really confident in dynamic. I am doing a 84mx15m 6-storey building. Thank…
  • Dynamic response combination. Steel Design

    Hi everyone, I am carrying out the dynamic analysis of a simple structure. The combination method of the response spectrum is defined as CQC (see first picture attached). However, the report file shows the different base shear values for different combinations…
  • seismic analysis dynamic and static difference

    Kindly do clarify my following doubt 1. I have attached three model a.static analysis model b. Dynamic analysis using reference load method c. Dynamic analysis without the use of reference load method a. Static method STAAD SPACE START JOB INFORMATION…
  • 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…
  • RBE3 elements in NASTRAN - is there a STAAD equivalent?

    RBE3 elements are used in NASTRAN to distribute mass and applied force from a single node to multiple points WITHOUT introducing additional stiffness. It is implemented in NASTRAN as a SINGLE DEPENDENT NODE whose displacement is an average of MULTIPLE…
  • How to simulate a building collapse on a staad pro structural design sofware.

    Please, i need your help, pls how can i simulate a building collapse on STAAD pro software, i am currently investigating the collapse mechanism of a structure and i am finding it difficult to simulate the progressive collapse using STAAD sofware, thank…
  • RAM Mass Participation with Ritz Vectors

    Hello, I have been trying to use the Ritz vector solution to get 90% mass participation in my model. I have noticed something I find odd, but perhaps this there is a rational explanation for this. Running 30 eigenvalue modes the mass participation in…
  • 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…
  • Frequency Check between Structure and Paddle Mixer

    Hi, I really need you help on this problem. We have a paddle mixer with Frequency at 1800rpm. We have extended the existing structure to accomodate the paddle mixer. Now we run a frequency check and compared it with the limits of 80%-120% of the…
  • RAM SS Merging Nodal Loads

    Hello, I have a three story building with a rigid diaphragm on levels 2 and 3 (level 1 is ground). My roof is a metal deck and I want to analyze it as flexible. I created my Nodal load cases labeled Roof-X and Roof-Y, both Seismic Load type. I need…
  • "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…
  • Is it possible to perform Dynamic analysis of Elevated Water Tank?

    Hey, I am trying to perform dynamic analysis of an Intze type water tank. Things to be considered for dynamic analysis is the sloshing impact and sloshing wave height where a certain portion of mass gets mobilized due to seismic effects.How can I get…
  • **ERROR- CASE BEING FACTORED IS DYNAMIC. CASE= 15

    SLR_ISO1_051517_RSA.std
  • Regarding Natural frequncies and modal participation

    Please help me regarding natural frequencies, Im trying to check my structure if its natural frequencies does not exist within the frequency range form +20% to -20% of frequency at rated speed or critical speed of turbine generator which is 50hz and…
  • RE: Dynamic Load

    Start with these STAAD.pro Dynamic Analysis FAQ. STAAD.Pro Dynamic Analysis STAAD.Pro Eigen Solution FAQ's STAAD.Pro Response Spectrum FAQ's