code: def load_structure_sample_data(st):
      
      # structure
      st.h_eff = 9.0  # m
      st.mass_eff = 120e3  # kg
      st.t_eff = 1.0  # s
      st.mass_ratio = 1.0
docs: Sample data for the Structure object
      :param st: Structure Object
      :return: