In the petrochemical business, it is quite common to see structural steel braces built from WT shapes. If you like Table 4-12 in the AISC 15th Edition, then you might like the attached example plots which I built on the same principle. AISC 15th Edition LRFD maximum axial capacities in kips; KL in feet Maximum […]

# 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

# 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 […]

# Protected: The Glass Age Sep 2019

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# knowledge, research, perseverance, adventure Aug 2019

How Gravity Built the World’s Fastest Jet Suit | WIRED

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