(1) As the original structure is flexible with bending stiffness, when you define a hinge (hinge axial direction is along y-aixs), you should define the proper bending stiffness of the hinge.
(2) there should be no gap between the splitted structural blocks (or very small gap to allow bending deformation between the structural blocks). Not sure why there is a 0.5m gap between these two blocks, as the moulded depth is just 2m.
(3) there is no need to define the surfaces of the blocks between the cutting, as shown the yellow parts below
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