from sectionproperties.pre.library import super_t_girder_section
from sectionproperties.pre.library import rectangular_section

super_t = super_t_girder_section(girder_type=5, w=2100)
slab = rectangular_section(d=180, b=2100).shift_section(
    x_offset=-1050, y_offset=75
)
(super_t + slab).plot_geometry()