topic Re: Multiple RSAP questions for EC design in Robot Structural Analysis Forum

Multiple RSAP questions for EC design

Anonymous — Wed, 29 Aug 2018 11:06:44 GMT

Hello,

I have been working on various model in RSAP doing the design according to Eurocode. I have come up to similar problem in most of them, and therefore I have a few questions:

1. In a simple model (MODEL1) attached to this post, I have tried a few different setting on a same model in order to resolve the problem regarding the common message "Excessive reinforcement ratio" or "Insufficient capacity against shear or torsion". Reading other posts on forums I have come up to a "solution" to uncheck Mx (torsion) in Member Type Definition, but that cannot be a common solution. Furthermore that does not help me in this model, but only when I uncheck Mz/Fy, reinforcement can be calculated.

2. On the same model, two of the slabs have been modeled as Floor(Panel) and other two as Cladding.
Same loads have been assigned on all of the separate structures, and generally beams on structures with panel have less deformation on bars which I guess is a result of panel stiffness. Please confirm that this is the case even for loads 3:LL which are vertical linear loads on beams. Furthermore, Is there an option in Robot to show only deformation in one global axis i.e. horizontal movement of the structure in X direction?

3. When working on a steel structure, is it possible to calculate connection of more then two beams automatically i.e. connection of Column, Beam and Trusses. Can RSAP recognize and use calculated forces in nodes or they have to be inputted manually for "more complicated" connections?

4. When having a moving load i.e. crane load, is it possible to avoid having multiple load cases for each position of moving load because that extremely multiplies number of load combinations and extends calculation time?

5.Final and most important question is regarding RC design... Is it possible to get a detailed output for RC design (something similar like in Steel design)? Is it possible to get an output of an algorithm used for RC design, without having to assign reinforcement to each and every element in RC Design/Provided reinforcement? And I have often come to a problem when calculating columns exposed to Bi-Axial bending (with Lambda>75), and when I do the same design in other softwares, no such problems occur.

I know this is a lot of questions and I would be upmost grateful if anyone can help at least on one issue.

Re: Multiple RSAP questions for EC design

Rafacascudo — Wed, 29 Aug 2018 19:00:36 GMT

2 - Yes for panel stiffness " stealing" moment from the beams.

No for directional displacement diagrams

4 - Generate load cases only for moving load components you want/need and then you can delete the moving load case from the model.

Re: Multiple RSAP questions for EC design

Anonymous — Thu, 30 Aug 2018 06:23:09 GMT

I forgot to attach MODEL 1

Re: Multiple RSAP questions for EC design

Anonymous — Thu, 30 Aug 2018 06:39:59 GMT

Thank you @Rafacascudo for your answer.
Regarding Problem no.4:
I know that i.e. if I have 20 positions of crane load, I can select 5 that I think are governing...

When I do the calculation for assigned moving load "Crane", I get two cases "Crane+" and "Crane-" which seem to represent Envelope influences. My question is if it is possible to have only those two cases (i.e. Case 4) which will represent Envelope of Crane loads in load combination?

Re: Multiple RSAP questions for EC design

Rafacascudo — Thu, 30 Aug 2018 18:20:39 GMT

When you include a moving load case into a combination with other regular load cases , RSA will also automatically create envelope combinations(+ -)

You cannot even select envelope cases (+ - ) to join a combination load case