Learning Forum

[MickMack]

Hi guys,

I am currently preparing a model of a 40 storey modular building for collapse analysis. The building is formed by the stacking of modular units, which are similar in structural layout to a shipping container, but with the addition of a concrete floor.

I have created some low level modules but find that the linear patterns available are not effective, and some errors are creeping in. For instance in the picture below i first modelled 2 module and analysed them sucessfully, but when i mirrored them some components were missed and the analysis would not solve.

[Rahul Kumbhar]

It appears to be selection problem before doing pattern. It may be able to select only surfaces or beams. You can manually select beams, surfaces from the tree and then use 'linear pattern' tool.n

[MickMack]

nThank you for the response do you think this is the best way to replicate the module? Is there any other options?.When i tried to share the new geometry it does not share the surfaces, shown in first screenshot, 16edges and 32 vertices selected. Then i selected the surfaces and beams as individual elements from the tree but it does not allow me to accept them as shown in the 2nd screenshot below.nnnnIs this related to the linear pattern?.The surfaces have been formed using the blend command, and they are supposed to represent 100mm concrete floor. I don't think this is the issue as it shared to mechanical okay and analysed when there were only two modules.nnThanksnMichaelnn

[Rahul Kumbhar]

It is not generating 'Share topology' because there is gap between surfaces. The edges are highlighted in first image since it will do 'share topo' for beams and surface edges which are coincident. Do the linear pattern with proper offset such as there wont be any gap.n

[MickMack]

nAre you referring to the gap between the modules shown below with the red arrows? nnAs this is a modular structure each module is independent and these gaps are necessary, therefore there will be 4 independent modules each with a floor connected to form the structure.nnI include below a screenshot of the single storey structure which i created first and which i was able to analyse in mechanical. You can see the gap below but the floor was sucessfully shared, in this instance.nnnMichealnn

[Rahul Kumbhar]

First try uncheck the box 'preserve instances' for the share options. Also I would not recommend to increase but you can try increasing the 'Coincidence tolerance' in the options tool on left side. n

[MickMack]

can you advise how to uncheck the box 'preserve instance' for the share options.n

[MickMack]

Thank you nYour assistance has helped me resolve this problem, and i have a nice clean geometry to import into mechanical. This has eliminated a host of problems that i was having in mechanical such as elements loosing properties, issues with nodes in surfaces etc etc.nnI have had to reduce the coincidence tolerance to 0.08m, but i consider that this is necessary as the gap between adjacent surfaces is 0.1m. A screen shot of this solution is provided below to close out this thread.nnMany Thanks.nnPS. The slab is formed with a rectangle in sketch and its edges are used for the beams.n