Easy Section Properties for Array of Points © Oct 2022
AISC bolt holes Aug 2022
This code illustrates the readability of Python.
Compare reading the text of AISC 15th Edition Manual, Section J3 to the program statements.
The (W)rapper Tower Sep 2021
Should this be celebrated?
Maybe only as a lesson learned.
Transmission Tower Details Dec 2020
I observed a few details of my neighborhood transmission tower.
Hyatt Regency Walkway Collapse
The Hyatt had been built just a few years before, during a nationwide pattern of fast-tracked large construction with reduced oversight and major failures. Its roof had partially collapsed during construction, and the ill-conceived skywalk design progressively degraded due to a miscommunication loop of corporate neglect and irresponsibility.
Yield Line Theory — Rotation Angles Feb 2020
World Refining Magazine
A magazine article I wrote in 2002.
AISC Bolt Shear — C Coefficient (with video) Jul 2019
AISC C Coefficient for Bolt Groups using Azure Jupyter Notebook Oct 2018
I decided to try out Jupyter using Microsoft Azure (currently a free trial). I’ve invested a couple of days on this project including learning new notebook extensions and Interact widgets. And so far, so good. Pros Easy to use Well-documented Relatively trouble-free Cons Could have faster response times
AISC C Coefficient for Bolt Groups using Pythonista Nov 2017
NOTE: Video format changed to MP4.
AISC C Coefficient for Bolt Groups (with video) Nov 2017
Replaces 48 pages of design tables in the AISC Manual. Allows any: bolt quantity or row spacing or column spacing or rotation No manual interpolation required. Karl Hoitsma, P.E. (khoitsma)
AISC Bolt Calculations Jul 2017
This spreadsheet calculates the C coefficient for a full range of bolt patterns (1 to 4 columns of bolts, 1 to 12 rows of bolts).
All values of all C coefficients in one Excel tab !