# ieCivil

Engineering the Digital Civilization

## Wednesday, 20 September 2017

 Frame Analysis

## BLC: Be Lazy When you Have a Computer to Compute

It has been a common approach in structural analysis and especially while analysing for earthquake forces to use the Frame Analysis methods such as Cantilever Method and et cetera. These methods are very time-consuming error prone, a single mistake and the entire ship could sink.

### So let's get back to work:

In my analysis I used Excel sheet to calculate the loads that would be acting on each storey using IS codes, I could have done this on STAAD but the university syllabus necessitates me to manually estimate the earthquake forces :-) but bad hand-writing and extreme laziness to calculate manually every modification force me to code down an excel sheet to get the work done!

Check out the excel sheet I prepared to calculated the forces that were acting on the structure:

This required a little effort but its' completely automated now and I could simply have an active instantaneous modification with automatic adaptation of fields that are constrained by formulas.

Once this task is done, comes the terrible task of manually performing all calculations but here we have software for our assistance and we shall be performing the calculation on STAAD pro.

I made a model of the structure in STAAD, assigned the properties and loadings and then performed the analysis to get the outputs. Within a few seconds, the task that would have required me at least 30 minutes was completed. As the building was not symmetric I had to perform two different analysis in two different forms for the X-Z plane and the other for the Y-Z plane.

Output for BMD of Structure X-Z plane through STAAD

This one is for the X-Z plane and the BMD is just the same as we obtain by solving manually using the portal frame method, now as the building is asymmetric, there is need of performing the earthquake forces and portal frame analysis for the other direction also.

Output for BMD of Structure Y-Z plane through STAAD

So this is how you can use STAAD for calculating the BMD within a few minutes and save time and efforts.

Apply the loads in in the form of concentrated nodal loads on the floors in acting the X or Y directions only. Let me know about your experiences analysing structures on STAAD.

A post shared by Er. Shadaab SAYYED | Ø´Ø§Ø¯Ø§Ø¨ Ø³ÙŠØ¯ (@sayyedshadaab) on

Until then
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