Modelling of loading bearing masonry structure

[Aslinn]

Hi,
I am trying to create a simply masonry structure. I think I'm doing something wrong but I couldn't fix it. Since this is a new feature of version 2020, I couldn't find much reference. Could someone please have a look and point out where I made mistakes?
I started with a simple box of 4m x 4m x 3m. All masonry load bearing wall. I used the section mws and element type masonry. As the first image below shows, I connected node N14 - 4, N12 - N2, N8 - 18 and N 16 - 6 for the wall. I'm running a pushover analysis and the force are applied at N15, N14 and N11. The bottom nodes are all fixed. In addition, I assigned five constraints as shown in the table below. The completed model is shown in the second image.


Constraint type Master Nodes Restrained DOFs Slave nodes
Rigid Diaphragm N18 X-Y plane N11 N12 N13 N14 N15 N16 N17
Rigid Link N14 x+y+z+rx+ry+rz N11
Rigid Link N14 x+y+z+rx+ry+rz N15
Rigid Link N18 x+y+z+rx+ry+rz N17
Rigid Link N18 x+y+z+rx+ry+rz N13



I will really appreciate your help.
Best Regards,
Aslinn

[z.gronti]

Dear Aslinn,

I am not able to view the images. Have you assigned rigid links at the top of the walls in order to connect them? If you have done so, could you please send me the model at z.gronti@seismosoft.com to check it?

[Aslinn]

Dear Zoi,
I have emailed you the model. Thank you for looking into it.
Best Regards,
Aslinn

[z.gronti]

Dear Aslinn,

I have replied to your email.

As a general suggestion is to check the model, starting from the correct connection of the structural elements. This may be done with the help of the Eigenvalue analysis.

Finally, I would like to inform you that a video showing how to model masonry structures in SeismoStruct will be published in a couple of days.

[jessie_7]

I have a similar issue. I receive an error indicating that the model cannot withstand the defined initial gravity and live loads. In the convergence tab, I have noticed that the masonry wall sections above the openings are causing the errors. I am thinking its because the walls are not connected. I would like my walls connected as I am trying to model a masonry building with a reinforced concrete ring beam at the top of the walls tying them all together. I would greatly appreciated any assistance.
I tried attaching an image of what is shown in the convergence tab, however I am uncertain if it was.

[seismosoft]

Not sure what you mean with 'the walls are not connected', the image you attached is not available.
If you carry out a search for 'convergence problems' in the forum you will find numerous posts on this issue. You could start by running an eigenvalue analysis to check if your model is well structured and all the members are correctly connected. Also, if you masonry members are unreinforced, add 4 small (2mm) rebars in the corners of the problematic members to provide increased stability, without significantly affecting the accuracy and the results.
Seismosoft Support

[jessie_7]

I noticed the problem in the convergence tab but uncertain as to how it can be solved. Is there anyway I can email the image as I am having difficulty attaching the image?

[jessie_7]

Since I cannot attach an image, I have included a link for a picture showing my problem that I am uncertain as to how it should be resolved.

https://1drv.ms/u/s!AnZaCHL2N2lYklKIMQR ... r?e=uzj3js

[jessie_7]

As per your advise, I have run an eigenvalue analysis which returned an error indicating that members are not connected as I thought. How can such error be resolved?
Below is a link to an image showing the error returned for the eigenvalue analysis
https://1drv.ms/u/s!AnZaCHL2N2lYklTsSPx ... Q?e=OXj9gp

[jessie_7]

I was able to get the eigenvalue analysis to run without error. However is there anyway to model pinned-pinned walls?