Hello fellow engineers. We had to design a bracket for a unitized curtain wall for a project in Paris, France (please see attached file). To allow for adjustments during installation the base plate has 2 big slotted holes. Therefore we had to use steel washers (plate 8 mm thk) for the anchors' installation. Since welding the washer to the base plate is not an option (don'task) we decided that the easiest solution is to fix the each washer using two grooved pins with round head(5 mm diameter). But is it the best? The supplier for the grooved pins cannot guarantee the single shear strenght for a pin (just the double shear streght) so they recommended a test.
Are there any better solutions (from a design point of view and installation also) that you can think of? Any feedback would be greatly appreciated.