{
  "schema_version": 1,
  "meta": {
    "name": "Moment-Curvature (OpenSees Ex 2)",
    "description": "RC column fibre section — constant axial P + DisplacementControl curvature pushover. Kip-in-ksi units throughout.",
    "author": "OpenSees Examples Manual",
    "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": [
          {
            "id": "X1",
            "ordinate": 0.0,
            "line_type": "Primary",
            "visible": true,
            "bubble_loc": "End",
            "color": "#808080"
          }
        ],
        "y_grid_lines": [
          {
            "id": "Y1",
            "ordinate": 0.0,
            "line_type": "Primary",
            "visible": true,
            "bubble_loc": "End",
            "color": "#808080"
          }
        ],
        "z_grid_lines": [
          {
            "id": "Z1",
            "ordinate": 0.0,
            "line_type": "Primary",
            "visible": true,
            "bubble_loc": "End",
            "color": "#808080"
          }
        ],
        "visible": true,
        "is_general": false,
        "hide_all": false,
        "glue_to_grid": false,
        "bubble_size": 20
      }
    }
  ],
  "nodes": [
    {
      "id": 1,
      "name": "Support",
      "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": "Crown",
      "coords": [
        0.0,
        0.0,
        0.0
      ],
      "mass": [
        0.0,
        0.0,
        0.0,
        0.0,
        0.0,
        0.0
      ],
      "restraint": [
        false,
        true,
        false,
        false,
        false,
        false
      ]
    }
  ],
  "materials": [
    {
      "id": 1,
      "name": "Core-Conc",
      "type": "Concrete01",
      "fpc": -6.0,
      "epsc0": -0.004,
      "fpcu": -5.0,
      "epsU": -0.014
    },
    {
      "id": 2,
      "name": "Cover-Conc",
      "type": "Concrete01",
      "fpc": -5.0,
      "epsc0": -0.002,
      "fpcu": 0.0,
      "epsU": -0.006
    },
    {
      "id": 3,
      "name": "Steel-60",
      "type": "Steel01",
      "Fy": 60.0,
      "E0": 30000.0,
      "b": 0.01,
      "a1": null,
      "a2": null,
      "a3": null,
      "a4": null
    }
  ],
  "sections": [
    {
      "id": 1,
      "name": "RC-Column",
      "type": "FiberSection",
      "GJ": null,
      "patches": [
        {
          "kind": "rect",
          "material_id": 1,
          "n_fib_y": 10,
          "n_fib_z": 1,
          "y_i": -10.5,
          "z_i": -6.0,
          "y_j": 10.5,
          "z_j": 6.0
        },
        {
          "kind": "rect",
          "material_id": 2,
          "n_fib_y": 10,
          "n_fib_z": 1,
          "y_i": -12.0,
          "z_i": 6.0,
          "y_j": 12.0,
          "z_j": 7.5
        },
        {
          "kind": "rect",
          "material_id": 2,
          "n_fib_y": 10,
          "n_fib_z": 1,
          "y_i": -12.0,
          "z_i": -7.5,
          "y_j": 12.0,
          "z_j": -6.0
        },
        {
          "kind": "rect",
          "material_id": 2,
          "n_fib_y": 2,
          "n_fib_z": 1,
          "y_i": -12.0,
          "z_i": -6.0,
          "y_j": -10.5,
          "z_j": 6.0
        },
        {
          "kind": "rect",
          "material_id": 2,
          "n_fib_y": 2,
          "n_fib_z": 1,
          "y_i": 10.5,
          "z_i": -6.0,
          "y_j": 12.0,
          "z_j": 6.0
        }
      ],
      "layers": [
        {
          "kind": "straight",
          "material_id": 3,
          "n_bars": 3,
          "bar_area": 0.6,
          "y_start": 10.5,
          "z_start": 6.0,
          "y_end": 10.5,
          "z_end": -6.0
        },
        {
          "kind": "straight",
          "material_id": 3,
          "n_bars": 2,
          "bar_area": 0.6,
          "y_start": 0.0,
          "z_start": 6.0,
          "y_end": 0.0,
          "z_end": -6.0
        },
        {
          "kind": "straight",
          "material_id": 3,
          "n_bars": 3,
          "bar_area": 0.6,
          "y_start": -10.5,
          "z_start": 6.0,
          "y_end": -10.5,
          "z_end": -6.0
        }
      ],
      "fibres": []
    }
  ],
  "elements": [
    {
      "id": 1,
      "name": "MK-Link",
      "type": "ZeroLengthSection",
      "nodes": [
        1,
        2
      ],
      "section_id": 1
    }
  ],
  "time_series": [
    {
      "id": 1,
      "name": "AxialP",
      "type": "Constant",
      "factor": 1.0
    },
    {
      "id": 2,
      "name": "RefMoment",
      "type": "Linear",
      "factor": 1.0
    }
  ],
  "load_patterns": [
    {
      "id": 1,
      "name": "AxialP",
      "type": "Plain",
      "time_series_id": 1,
      "nodal_loads": [
        {
          "node_id": 2,
          "forces": [
            -180.0,
            0.0,
            0.0,
            0.0,
            0.0,
            0.0
          ]
        }
      ],
      "element_loads": []
    },
    {
      "id": 2,
      "name": "RefMoment",
      "type": "Plain",
      "time_series_id": 2,
      "nodal_loads": [
        {
          "node_id": 2,
          "forces": [
            0.0,
            0.0,
            0.0,
            0.0,
            0.0,
            1.0
          ]
        }
      ],
      "element_loads": []
    }
  ],
  "spectra": [],
  "analyses": [
    {
      "id": 1,
      "name": "MK",
      "type": "Pushover",
      "pattern_ids": [
        1,
        2
      ],
      "control_node": 2,
      "control_dof": 3,
      "target_disp": 0.0019047619047619052,
      "step_size": 1.9047619047619053e-05,
      "base_nodes": [
        1
      ],
      "system": "BandGeneral",
      "constraints": "Plain",
      "algorithm": "Newton",
      "test": "NormUnbalance",
      "tolerance": 1e-09,
      "max_iter": 25
    }
  ]
}