pyconmech.frame_analysis.StiffnessChecker

class pyconmech.frame_analysis.StiffnessChecker(model, verbose=False, checker_engine='numpy')[source]

Bases: object

stiffness checking instance for 3D frame deformation analysis

Calculating elastic deformation given a 3D frame shape.

__init__(model, verbose=False, checker_engine='numpy')[source]

Constructor of the StiffnessChecker

Parameters

model (io_base.Model) – the structural model
verbose (bool, optional) – verbose output, by default False
checker_engine (str, optional) – “numpy” or “C++”, by default DEFAULT_ENGINE

Raises

NotImplementedError – [description]
NotImplementedError – [description]
RuntimeError – [description]

Methods

`__init__`(model[, verbose, checker_engine])	Constructor of the StiffnessChecker
`StiffnessChecker.from_frame_data`
`from_json`([json_file_path, verbose, …])	init class from a frame json file
`get_compliance`()	Get compliance of the last solved deformation
`get_deformed_shape`([disc, exagg_ratio])
`get_element2dof_id_map`()	Get element_id-to-dof_id maps
`get_element_connected_node_ids`([…])	return connected nodes’ indices of the elements specified in `existing_ids`
`get_element_local2global_rot_matrices`()	Get all elemental local to global transformation matrices, each of which is 12 x 12
`get_element_neighbors`()	Return all elements’ connected element ids
`get_element_stiffness_matrices`([…])	Get all elemental stiffness matrices, each of which is 12 x 12 in global coordinate (default): R_{LG}^T * K_{eL} * R_{LG} in local coordinate (default): K_{eL}
`get_max_nodal_deformation`()	Get max nodal deformation info
`get_nodal_deformation_tol`()	Get nodal displacement tolerance for stiffness checking criteria.
`get_nodal_loads`([existing_ids, dof_flattened])	Return nodal loads
`get_node2dof_id_map`()	Get node_id-to-dof_id maps
`get_node_neighbors`([return_e_id])	Return all nodes’ connected element ids
`get_original_shape`([disc, draw_full_shape])
`get_self_weight_loads`([existing_ids, …])	Return lumped gravity loads
`get_solved_results`([existing_ids])	Fetch back solved results from last time.
`has_stored_result`()	Check if the stiffness checker has solved results stored, i.e.
`set_loads`(loadcase)	set load case for the stiffness checker.
`set_nodal_displacement_tol`([trans_tol, rot_tol])	Set nodal displacement tolerance for stiffness checking criteria.
`set_output_json`([do_output, output_dir, …])	DEPRECATED
`set_self_weight_load`(gravity_load)	Turn on/off self-weight load.
`solve`([exist_element_ids, if_cond_num, …])	compute elastic deformation using the linear stiffness equation, return True or False indicating if the set criteria is passed nor not.

Attributes

`elements`
`fix_element_ids`	return grounded element ids
`fix_node_ids`	fixed node indices
`StiffnessChecker.fix_specs`
`StiffnessChecker.material`
`model_name`
`StiffnessChecker.model_type`
`node_points`

__init__(model, verbose=False, checker_engine='numpy')[source]

Constructor of the StiffnessChecker

Parameters

model (io_base.Model) – the structural model
verbose (bool, optional) – verbose output, by default False
checker_engine (str, optional) – “numpy” or “C++”, by default DEFAULT_ENGINE

Raises

NotImplementedError – [description]
NotImplementedError – [description]
RuntimeError – [description]