Recent content by alannakate

That was the answer I got from some other engineers at my company as well. Glad to get another opinion that because it's easier is really the only reason to use one over the other.

Hello, I'm struggling to figure out the simplified method vs the equivalent static method in the seismic portion of the 2015 National Building Code of Canada. The seismic hazard index is listed as IeFsSa(0.2) and IeFsSa(2.0) (Cl. 4.1.8.1 (2)). If these values are less than 0.13 and 0.03 then...

I redrew my model so that instead of a lumped mass system it was more similar to the real life structure. I used four columns and plate elements for my floors. Then I allowed the mass of the columns to be distributed along their length while all other masses got lumped at the nodes on each...

Thanks, I've got it figured out.

Hi, I would like to assign a sine function acceleration to a specific node in my structure instead of the ground acceleration that is the default for time history analysis. How can I do this? Thanks!

Nevermind, I figured it out!

I have a simplified model made in SAP2000 of a small structure that I constructed. The structure consists of 3 levels above ground level. Each storey is 400mm in height so the total height is 1200mm. The columns are continuous from the base to the top of the structure and are made of steel...

I have modeled a building, applied a horizongal sinusoidal load to the top floor causing the building to vibrate, and am trying to make sense of my results (fundamental frequency and mode shape in particular). I want to make sure that I have the relationships between different variables correct...

ishvaaag, I have been away and so I just had a chance to look at what you have written and try it out. My model now gives 0.86Hz! Thank you so much for all of your help, I really appreciate it. My biggest problem was that I had the lamp applied as a load instead of a joint mass and I only had...

Thanks Jatfuentes, Dividing the members causes the analysis to converge to 0.64 Hz, which is closer. I have the gravity turned on (to get the post mass) and the lamp applied as a dead load at the top. I have my mass source set to be from element and any additional masses or loads with the dead...

Hi osquro, I don't have the hand calculations for the answer because I got the problem online and the answer was in brackets at the end. I will try it by hand using a distributed mass system and see what I get. Hi Jatfuentes, Good idea. How do I change the discretization in SAP? Thank you.

I have a simple dynamic problem that I'm trying to do in SAP2000 to make sure I know what I'm doing before modeling a more complicated structure. I cannot get the correct first modal frequency from SAP. Here is the problem: A lamp post is 12m tall, fixed at the base, with a 7.5kg lamp at the...