MIT Sean Collier Memorial

[bitacovir]

Once this model is ready, I would like to add it to this list:
https://wiki.osarch.org/index.php?title ... in_FreeCAD

[thschrader]

All granite-blocks are cutted. The "Slice apart" tool in part-wb works perfect, when
upgrading the extruded sketch / faces to "Boolean fragments". As deepsoic mentioned above.
The keystone was a little bit difficult (for me), because all side-faces are tilted.
Lets calculate center of gravity and selfweight of each block.

granite_blocks.JPG (85.48 KiB) Viewed 786 times

[thschrader]

You can reduce the problem to one 3D-graphic equilibrium (keystone) and five 2 D sketches (the legs).
The center of gravity of all blocks are in line and nearly meet at the center of gravity of the keystone. In my model
the forces 1+2 will give a little resulting moment M among the z-Axis. However. (Best approach: start with designing the keystone…)
If you assume that the selfweight of the keystone (red line) can be distributed equally with 1/5 to each connected stone,
you can construct the force polygon for each face (from each vertical component of the triangle). The horizontal component
of the triangle is the starting point for the thrustline, as shown for leg A.
The thrustline has a high horizontal force at the level of the foundation, that’s why they bolted it together.

thrustline_blocks.JPG (65.92 KiB) Viewed 705 times

[thschrader]

Download complete FC-file from dropbox (145 MB, believe it or not):
https://www.dropbox.com/s/vujcnky9uueod ... FCStd?dl=0

[bitacovir]

Added to the FreeCAD 3D model list.
https://wiki.osarch.org/index.php?title ... in_FreeCAD