Detailing matters! Original design vs Actual fabrication STRUCTURE Magazine August 2016
Yield Line Theory — Rotation Angles Feb 2020
In this post, I provide derivations for the rotation angles between planes. We have two formulas: An exact formula [Eq 1] An approximate (easy and sufficient) formula [Eq 2] My link to my calculations Link to Blodgett Example
Single angle braces vs WT braces Feb 2020
In the petrochemical business, it is quite common to see structural steel braces built from WT shapes. Because I prefer the simplicity of using a single angle brace, I prepared a general calculation set demonstrating a few use cases. Link to my single angle brace calculations
World Refining Magazine
A magazine article I wrote in 2002. Link to Reformer Design Article
The Lincoln Index — Software Bugs Jan 2020
John, Thanks for the presentation. https://www.johndcook.com/blog/2010/07/13/lincoln-index/ How many errors are left to find?
Calculate Beta w for Single Angles Dec 2019
AISC v15.0 Shapes Database # NOTE # For enhanced readability and easier translation to other software, # exponents are indicated with the (mathematically) traditional caret symbol. # In Python, replace all carets with a double asterisk. # Get single angle properties a = np.arctan(my_angle.TANA) c = np.cos(a) s = np.sin(a) b = my_angle.B_LOWERCASE d = […]
Structural Property Calculator — Improved Dec 2019
# calc> ddet(..w8x31) # not case sensitive 8.0 # # On assignment, now, the calculator # returns __str__(object) # the string representation of the object # # Therefore, # On assignment of an AISC shape the calculator # returns __str__(shape) # the string representation of the shape # calc > a = ..w8x31 # not […]
Python — Nested Ifs Nov 2019
NESTED IFs: A question was asked recently on Stack Overflow The solution shown below is readable, scalable, easily edited — and contains no IF statements. This is similar to the method proposed by Anitoliy R except I use a single string and the split function to simplify editing and scaling. To illustrate scalability, I add […]
Structural Property Calculator on iPad/iPhone using Pythonista Oct 2019
# General use as a numerical calculator calc > a = 3 calc > b = 4 calc > c=(a**2+b**2)**0.5 # white space does not matter calc > a 3.0 calc > b 4.0 calc > c 5.0 calc > 5 + (30 * 3 ** 2) – 23/46 274.5 # Use with structural properties […]
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