phase analysis + thermal loading

[Anonymous]

Hi everyone,

I am modelling SBR tank and at the moment I am focusing on early stage temperature effect on the concrete base slab. The base slab will be poured in three stages. I am aware that Robot has a built in option for construction phase analysis where you can gradually add elevations, assign the self-weight etc. I am interested in simulating the previously mentioned concrete pours, taking into account the effect of thermal shrinkage of the concrete for each stage. Can this be done in Robot, considering that the temperature will change in each bay depending on the pour stage and restrained factor? Can temperature loading be sequenced similarly to self-weigh in the “phase” type of analysis? I am attaching a simple diagram showing the idea of what I am looking for.

Thank you in advance for all the help.

[Pawel.Pulak]

Hello,

it can be done in phases for temperature loading - but only when Young's modulus is assumed constant.

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Regards,

[Rafacascudo]

Can´t the bar or panel material be changed from phase to phase???

[Anonymous]

Thanks a million, that's great news. 

I am not sure how to go about it though. What I am exactly trying to do is:

1) Phase 1 - Model BAY 1 and apply -20 degrees in x direction to simulate shrinkage.

2) Read membrane (N) forces generated by the thermal action

3) Add second phase with Bay 2 where BAY 1 has cooled down to i.e. 0 degrees and BAY 2 has now -20 degrees applied to it in x direction.

4) See what effect the thermal action in BAY 2 has on BAY 1 by reading membrane forces

5) Repeat procedure for BAY 3.

The "E" value remains constant 

Would you be able to tell me how could I go about it? 

Thank you for all the help in advance

[Pawel.Pulak]

Hi @Rafacascudo,

it is possible to change material from phase to phase but it can result in various anomalies in post-processing of the collected phase.

See these forum posts:

Stress results with phase collections

construction stages

That is why I preferred not to recommend it to beginners.

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Regards,

[Pawel.Pulak]

Hi @Anonymous

have you some model of this structure (without phases but with geometry, supports, ...) to use it?

Regards,

[Anonymous]

I am attaching the file with some additional information.

Regards

[Anonymous]

Has there been any update in relation to the problem I have posted? I would appreciate any help in the matter.

Kind Regards,

Wawrzyniec