{
  "schema_version": 1,
  "meta": {
    "name": "Eigen - Two-Storey Shear Frame",
    "description": "Two-storey shear frame with equalDOF floor constraints and two-mode eigenvalue analysis.",
    "author": "OpenSees Wiki / Chopra Example 10.4",
    "units": "US (in, kip, kip·s²/in, s, ksi)"
  },
  "ndm": 2,
  "ndf": 3,
  "coord_systems": [
    {
      "name": "Global",
      "coord": {
        "origin": [
          0.0,
          0.0,
          0.0
        ],
        "rotation_deg": [
          0.0,
          0.0,
          0.0
        ]
      },
      "grid": {
        "x_grid_lines": [],
        "y_grid_lines": [],
        "z_grid_lines": [],
        "visible": true,
        "is_general": false,
        "hide_all": false,
        "glue_to_grid": false,
        "bubble_size": 20
      }
    }
  ],
  "nodes": [
    {
      "id": 1,
      "name": "N1",
      "coords": [
        0.0,
        0.0,
        0.0
      ],
      "mass": [
        0.0,
        0.0,
        0.0,
        0.0,
        0.0,
        0.0
      ],
      "restraint": [
        true,
        true,
        false,
        false,
        false,
        true
      ]
    },
    {
      "id": 2,
      "name": "N2",
      "coords": [
        288.0,
        0.0,
        0.0
      ],
      "mass": [
        0.0,
        0.0,
        0.0,
        0.0,
        0.0,
        0.0
      ],
      "restraint": [
        true,
        true,
        false,
        false,
        false,
        true
      ]
    },
    {
      "id": 3,
      "name": "N3",
      "coords": [
        0.0,
        144.0,
        0.0
      ],
      "mass": [
        0.25906735751295334,
        0.0,
        0.0,
        0.0,
        0.0,
        0.0
      ],
      "restraint": [
        false,
        false,
        false,
        false,
        false,
        false
      ]
    },
    {
      "id": 4,
      "name": "N4",
      "coords": [
        288.0,
        144.0,
        0.0
      ],
      "mass": [
        0.25906735751295334,
        0.0,
        0.0,
        0.0,
        0.0,
        0.0
      ],
      "restraint": [
        false,
        false,
        false,
        false,
        false,
        false
      ]
    },
    {
      "id": 5,
      "name": "N5",
      "coords": [
        0.0,
        288.0,
        0.0
      ],
      "mass": [
        0.12953367875647667,
        0.0,
        0.0,
        0.0,
        0.0,
        0.0
      ],
      "restraint": [
        false,
        false,
        false,
        false,
        false,
        false
      ]
    },
    {
      "id": 6,
      "name": "N6",
      "coords": [
        288.0,
        288.0,
        0.0
      ],
      "mass": [
        0.12953367875647667,
        0.0,
        0.0,
        0.0,
        0.0,
        0.0
      ],
      "restraint": [
        false,
        false,
        false,
        false,
        false,
        false
      ]
    }
  ],
  "materials": [],
  "sections": [
    {
      "id": 1,
      "name": "Column-L1",
      "type": "ElasticSection",
      "E": 30000.0,
      "A": 63.41,
      "Iz": 640.0,
      "Iy": null,
      "G": null,
      "J": null
    },
    {
      "id": 2,
      "name": "Column-L2",
      "type": "ElasticSection",
      "E": 30000.0,
      "A": 63.41,
      "Iz": 320.0,
      "Iy": null,
      "G": null,
      "J": null
    },
    {
      "id": 3,
      "name": "Beam-Rigid",
      "type": "ElasticSection",
      "E": 30000.0,
      "A": 63.41,
      "Iz": 10000000000000.0,
      "Iy": null,
      "G": null,
      "J": null
    }
  ],
  "elements": [
    {
      "id": 1,
      "name": "C1",
      "type": "ElasticBeamColumn",
      "nodes": [
        1,
        3
      ],
      "section_id": 1,
      "geom_transf": "Linear",
      "rho": 0.0
    },
    {
      "id": 2,
      "name": "C2",
      "type": "ElasticBeamColumn",
      "nodes": [
        3,
        5
      ],
      "section_id": 2,
      "geom_transf": "Linear",
      "rho": 0.0
    },
    {
      "id": 3,
      "name": "C3",
      "type": "ElasticBeamColumn",
      "nodes": [
        2,
        4
      ],
      "section_id": 1,
      "geom_transf": "Linear",
      "rho": 0.0
    },
    {
      "id": 4,
      "name": "C4",
      "type": "ElasticBeamColumn",
      "nodes": [
        4,
        6
      ],
      "section_id": 2,
      "geom_transf": "Linear",
      "rho": 0.0
    },
    {
      "id": 5,
      "name": "B1",
      "type": "ElasticBeamColumn",
      "nodes": [
        3,
        4
      ],
      "section_id": 3,
      "geom_transf": "Linear",
      "rho": 0.0
    },
    {
      "id": 6,
      "name": "B2",
      "type": "ElasticBeamColumn",
      "nodes": [
        5,
        6
      ],
      "section_id": 3,
      "geom_transf": "Linear",
      "rho": 0.0
    }
  ],
  "mp_constraints": [
    {
      "retained_node": 3,
      "constrained_node": 4,
      "dofs": [
        2,
        3
      ]
    },
    {
      "retained_node": 5,
      "constrained_node": 6,
      "dofs": [
        2,
        3
      ]
    }
  ],
  "time_series": [],
  "load_patterns": [],
  "spectra": [],
  "analyses": [
    {
      "id": 1,
      "name": "Modal-2",
      "type": "Modal",
      "n_modes": 2,
      "solver": "genBandArpack"
    }
  ]
}