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Analyse 2D Frames and trusses for slender structures. Determine the bending moments, shear forces, axial forces and displacements.
For the actively developed version:
$ pip install git+https://github.com/ritchie46/anaStruct.git
Or for a release:
$ pip install anastruct
Got a question? Please ask on gitter.
- trusses ✔️
- beams ✔️
- moment lines ✔️
- axial force lines ✔️
- shear force lines ✔️
- displacement lines ✔️
- hinged supports ✔️
- fixed supports ✔️
- spring supports ✔️
- q-load in elements direction ✔️
- point loads in global x, y directions on nodes ✔️
- dead load ✔️
- q-loads in global y direction ✔️
- hinged elements ✔️
- rotational springs ✔️
- non-linear nodes ✔️
- geometrical non linearity ✔️
- load cases and load combinations ✔️
- generic type of section - rectangle and circle ✔️
- EU, US, UK steel section database ✔️
from anastruct import SystemElements import numpy as np ss = SystemElements() element_type = 'truss' # Create 2 towers width = 6 span = 30 k = 5e3 # create triangles y = np.arange(1, 10) * np.pi x = np.cos(y) * width * 0.5 x -= x.min() for length in [0, span]: x_left_column = np.ones(y[::2].shape) * x.min() + length x_right_column = np.ones(y[::2].shape[0] + 1) * x.max() + length # add triangles ss.add_element_grid(x + length, y, element_type=element_type) # add vertical elements ss.add_element_grid(x_left_column, y[::2], element_type=element_type) ss.add_element_grid(x_right_column, np.r_[y[0], y[1::2], y[-1]], element_type=element_type) ss.add_support_spring( node_id=ss.find_node_id(vertex=[x_left_column[0], y[0]]), translation=2, k=k) ss.add_support_spring( node_id=ss.find_node_id(vertex=[x_right_column[0], y[0]]), translation=2, k=k) # add top girder ss.add_element_grid([0, width, span, span + width], np.ones(4) * y.max(), EI=10e3) # Add stability elements at the bottom. ss.add_truss_element([[0, y.min()], [width, y.min()]]) ss.add_truss_element([[span, y.min()], [span + width, y.min()]]) for el in ss.element_map.values(): # apply wind load on elements that are vertical if np.isclose(np.sin(el.ai), 1): ss.q_load( q=1, element_id=el.id, direction='x' ) ss.show_structure() ss.solve() ss.show_displacement(factor=2) ss.show_bending_moment()
from anastruct import SystemElements ss = SystemElements(EA=15000, EI=5000) # Add beams to the system. ss.add_element(location=[0, 5]) ss.add_element(location=[[0, 5], [5, 5]]) ss.add_element(location=[[5, 5], [5, 0]]) # Add a fixed support at node 1. ss.add_support_fixed(node_id=1) # Add a rotational spring support at node 4. ss.add_support_spring(node_id=4, translation=3, k=4000) # Add loads. ss.point_load(Fx=30, node_id=2) ss.q_load(q=-10, element_id=2) # Solve ss.solve() # Get visual results. ss.show_structure() ss.show_reaction_force() ss.show_axial_force() ss.show_shear_force() ss.show_bending_moment() ss.show_displacement()
