Frame Analysis Using Python: A Guide for Beginners
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Introduction
Verifying our structural analysis calculation is important, but it’s time-consuming.
That is why if you can automate the process of structural analysis through coding,
then auditing your manual structural calculation results accuracy will be much easier.
Hence, I decided to write a Python program to help me analyze a 2d frame structure.
Learning how to program as an engineer or a student in engineering will help you build
structural analyses and finite element tools that might become a
Viktor is a development platform with a value proposition of helping civil engineering
companies develop their in-house engineering analyses and design tools with nothing
but Python programming language.
2d Frame Analysis Using Python: A Guide for Beginners We are going to be using
a Python library called anastruct. anastruct is a Python implementation of the 2D finite element method for structures.
It allows you to do a structural analysis of frames and trusses. It helps you to compute
the forces and displacements in the structural elements.
Materials
I use VS code as my (IDE)
Python 3.10.0
anastruct which is a Python library developed by Richie Vink for frame and truss analysis
The diagram above is from the structville website.
We are going to be computing and plotting the following: Bending moment diagram
Shear force diagram
Step 1: Install the Library Using the Pip Command
Open your VScode terminal, and type the following:
pip install anastruct
Step 2: Import the SystemElement Class
This is the blueprint holding the behavior and properties of our structural elements
Step 3: Create the Structural Object From the System Class
We are now going to create our structural element object(ss) by instantiating our
SystemElement class that we imported like this:
Step 4: Create Structural Elements With Nodal Positions
Now, we are going to use the add _element method from the systemElement class. What this does is add different members into a frame connected at nodes and
the argument locations to add various spans or lengths of the members.
Step 5: Let’s Define Hinges
From the original question, We have two internal hinges at nodes 3(B) and 5(2).
So, we are adding the internal hinges using the add_inernal_hinges method.
Step 6: Define Support Conditions
The frame structure has 3 supports. At node1 is fixed, node4 is roller support, and
node6 is roller.
Step 7: Add External Forces(load) to the Structure
We add horizontal point load at node2 using the point_load method passing the node location, and the magnitude of the load as an argument. Also, for
the other point load.
For the uniformly distributed using q_load method is used, and passing the element_id the load is acting on with the magnitude of the
load q. The — sign in the load magnitude q signifies the load is acting downward.
Step 8: Analyze the Response of the Structure and Show the Reaction Forces
We use the solve method to compute the reaction forces, bending stresses, shear forces, and axial forces of the
frame.
We use the show_reaction_force method to plot the frame with the reaction forces at the supports:
Step 9: Plot the Bending Moment Diagram
We use the show bending moment method to plot the bending moment diagram of the frame.
ss.show_bending_moment()
.
Step 10: Plot Shear Force Diagram
To plot the shear force diagram, we use the show shearforce method.
The Python plotting is on the one up, and the diagram from the manual solution is on the
down.
Step 11: Plot Axial Force
Conclusion
Many civil engineering firms are using Python to create custom tools that solve complex
problems. It will be cool as a student in civil engineering to learn how to program in
Python while solving your domain problems.
from: https://hackernoon.com/2d-frame-analysis-using-python-a-guide-for-beginners!
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