{
  "schema_version": 1,
  "meta": {
    "name": "Concrete04 Cantilever",
    "description": "Single RC column cantilever using Concrete04 (Popovics) fiber section. Demonstrates the Concrete04 material end-to-end: schema → model → runner → results.",
    "author": "",
    "units": "SI (m, N, kg, s, Pa)"
  },
  "ndm": 2,
  "ndf": 3,
  "coord_systems": [
    {
      "name": "Global",
      "coord": {
        "origin": [
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          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": "Base",
      "coords": [
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      ],
      "mass": [
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        0.0,
        0.0,
        0.0,
        0.0
      ],
      "restraint": [
        true,
        true,
        true,
        false,
        false,
        false
      ]
    },
    {
      "id": 2,
      "name": "Top",
      "coords": [
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        0.0
      ],
      "mass": [
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        0.0,
        0.0,
        0.0
      ],
      "restraint": [
        false,
        false,
        false,
        false,
        false,
        false
      ]
    }
  ],
  "materials": [
    {
      "id": 1,
      "name": "C30-Popovics",
      "type": "Concrete04",
      "fpc": -30000000.0,
      "epsc0": -0.002,
      "epscu": -0.005,
      "Ec": 25742960202.74281,
      "fct": 2200000.0,
      "et": 0.0001,
      "beta": null
    },
    {
      "id": 2,
      "name": "Rebar-B500",
      "type": "Steel02",
      "Fy": 420000000.0,
      "E0": 200000000000.0,
      "b": 0.01,
      "R0": 18.0,
      "cR1": 0.925,
      "cR2": 0.15
    }
  ],
  "sections": [
    {
      "id": 1,
      "name": "RC-Fiber-C04",
      "type": "FiberSection",
      "GJ": null,
      "patches": [
        {
          "kind": "rect",
          "material_id": 1,
          "n_fib_y": 8,
          "n_fib_z": 4,
          "y_i": -0.15,
          "z_i": -0.15,
          "y_j": 0.15,
          "z_j": 0.15
        }
      ],
      "layers": [
        {
          "kind": "straight",
          "material_id": 2,
          "n_bars": 4,
          "bar_area": 0.000314,
          "y_start": -0.12,
          "z_start": 0.12,
          "y_end": -0.12,
          "z_end": -0.12
        },
        {
          "kind": "straight",
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          "n_bars": 4,
          "bar_area": 0.000314,
          "y_start": 0.12,
          "z_start": 0.12,
          "y_end": 0.12,
          "z_end": -0.12
        }
      ],
      "fibres": []
    }
  ],
  "elements": [
    {
      "id": 1,
      "name": "Column",
      "type": "ForceBeamColumn",
      "nodes": [
        1,
        2
      ],
      "section_id": 1,
      "integration_points": 5,
      "geom_transf": "Linear",
      "max_iter": 10,
      "tolerance": 1e-12
    }
  ],
  "mp_constraints": [],
  "time_series": [
    {
      "id": 1,
      "name": "Gravity",
      "type": "Linear",
      "factor": 1.0
    },
    {
      "id": 2,
      "name": "Lateral",
      "type": "Linear",
      "factor": 1.0
    }
  ],
  "load_patterns": [
    {
      "id": 1,
      "name": "Gravity",
      "type": "Plain",
      "time_series_id": 1,
      "nodal_loads": [
        {
          "node_id": 2,
          "forces": [
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            0.0,
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            0.0,
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        }
      ],
      "element_loads": []
    },
    {
      "id": 2,
      "name": "Pushover-X",
      "type": "Plain",
      "time_series_id": 2,
      "nodal_loads": [
        {
          "node_id": 2,
          "forces": [
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            0.0,
            0.0,
            0.0,
            0.0
          ]
        }
      ],
      "element_loads": []
    }
  ],
  "spectra": [],
  "analyses": [
    {
      "id": 1,
      "name": "Gravity",
      "type": "Static",
      "pattern_ids": [
        1
      ],
      "n_steps": 10,
      "load_factor_increment": 0.1,
      "system": "BandGeneral",
      "constraints": "Plain",
      "integrator": "LoadControl",
      "algorithm": "Newton",
      "test": "NormDispIncr",
      "tolerance": 1e-08,
      "max_iter": 10
    },
    {
      "id": 2,
      "name": "Push-X",
      "type": "Pushover",
      "pattern_ids": [
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      ],
      "control_node": 2,
      "control_dof": 1,
      "target_disp": 0.15000000000000002,
      "step_size": 0.003,
      "base_nodes": [
        1
      ],
      "system": "BandGeneral",
      "constraints": "Plain",
      "algorithm": "Newton",
      "test": "EnergyIncr",
      "tolerance": 1e-08,
      "max_iter": 10,
      "preload_case_ids": [
        1
      ]
    }
  ]
}