WHY?

• I can't find any civil engineering library...
• Build a quick and cheap demo to see how it works
• Automate Automate Automate Automate Automate Automate Automate
• Optimize material usage

Date: 20190412

Author: Curtis

Version: 0.1

FEATURES

• class oriented
• basic geometry input
• basic loading input
• Code to be packaged for portability

TODO

• SFD, BMD, deflection
• columns
• frames
• conenctivity
• section capacity check
• load factors (euro code?)
• load as a class, not as a dict
• visualize

INPUT:

• P,L

OUTPUT:

• A,B, any point at X
• reactions
• shear
• bending

from civpy import Beam

B1 = Beam.Beam_Simple('B1',20)
B1.show_units()

        All units in SI
        Load: kN
        Length: meter

B1.add_point_load(6400,15)
B1.add_point_load(3200,4)

# quick check internal forces of 1 point load
B1.cal_reaction(B1.loads[0])

4800.0 1600.0

B1.cal_all_reactions()
B1.__dict__

{'name': 'B1',
 'L': 20,
 'loads': [{'load_type': 'point', 'load_value': 6400, 'distance_from_a': 15},
  {'load_type': 'point', 'load_value': 3200, 'distance_from_a': 4}],
 'SFD': [],
 'BMD': [],
 'R_a': 5440.0,
 'R_b': 4160.0,
 'reactions': (5440.0, 4160.0),
 'P': 3200,
 'a': 4}

Rewrite this in python

a typical day of a small civil engineering potato

1. read drawing

• input geometry
• calculate reaction
• calculate SFD,BMD
• section capacity check
• repeat

https://structx.com/Beam_Formulas_008.html

• FBD = free body diagram

• SFD = shear force diagram

• BMD = bending moment diagram

• a & b = distance to point load, in or m

• E = modulus of elasticity, psi or MPa

• I = second moment of area, in4 or m4

• L = span length under consideration, in or m

• M = maximum bending moment, lbf.in or kNm

• P = total concentrated load, lbf or kN

• R = reaction load at bearing point, lbf or kN

• V = maximum shear force, lbf or kN

• ∆ = deflection or deformation, in or m

• x = horizontal distance from reaction point, in or m