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Buckling Analysis Control

A nested class within AnalysisControl used to create buckling analysis control for eigenvalue buckling analysis.

Constructor

AnalysisControl.Buckling(mode_num = None, opt_positive = True, load_factor_from = 0, load_factor_to = 0, opt_sturm_seq = False, opt_consider_axial_only = False, load_case_data = None)

Creates buckling analysis control settings for eigenvalue buckling analysis.

Parameters

  • mode_num: Number of Modes (required)
  • opt_positive (default=True): Load Factor Range Type
  • load_factor_from (default=0): Search From - Lower bound for load factor search range (only used when opt_positive is False)
  • load_factor_to (default=0): Search To - Upper bound for load factor search range (only used when opt_positive is False)
  • opt_sturm_seq (default=False): Check Sturm Sequence
  • opt_consider_axial_only (default=False): Frame Geometric Stiffness Option
  • load_case_data: Load Cases with Scale Factors and Types (required)
  • List of load cases with their scale factors and load types
  • Format: [["LC1", factor1, load_type1], ["LC2", factor2, load_type2], ...]
  • Load Type: 0=Variable, 1=Constant

Object Attributes

  • ID (int): The ID of the buckling control entry (always 1).
  • MODE_NUM (int): Number of modes to calculate.
  • OPT_POSITIVE (bool): Load factor range type setting.
  • LOAD_FACTOR_FROM (float): Lower bound for load factor search.
  • LOAD_FACTOR_TO (float): Upper bound for load factor search.
  • OPT_STURM_SEQ (bool): Sturm sequence check setting.
  • OPT_CONSIDER_AXIAL_ONLY (bool): Frame geometric stiffness option.
  • LOAD_CASE_DATA (list): Load cases with scale factors and types.

Examples

# Basic buckling analysis
AnalysisControl.Buckling(
    mode_num=5,
    load_case_data=[["DL", 1.0, 1]]
)

# Advanced buckling analysis with search range
AnalysisControl.Buckling(
    mode_num=8,
    opt_positive=False,
    load_factor_from=-2.0,
    load_factor_to=5.0,
    opt_consider_axial_only=True,
    load_case_data=[
        ["DL", 1.0, 1],
        ["LL", 1.0, 0]
    ]
)