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…
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?
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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 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…
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…
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…
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…
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…
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…
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…
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…
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…