Karl Hoitsma, P.E.
Structural Engineer
Tyler, TX
I am interested in doing consulting work for other engineers.
- Industrial,
- Institutional,
- Commercial, or
- Research
For instance, happy to assist with review, checking, calculations, or programming.
Typically available on short notice, tight deadlines, willing to work off-shift – nights, weekends.
Email: khoitsma at mathpax.com
Search the blog by subject matter: Tabular List — Blog Entry Search
Extensive experience in programming suited to engineering work — examples follow:
STRUCTURAL ENGINEERING | |
LINK | DISCUSSION |
ASCE Exact Wind Integration (closed form equations) | Developed single function to calculate all aspects of ASCE wind design:
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Multi-Page Apps using Dash/PythonAnywhere Apr2020 | Developed working online apps for structural design:
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WT Braces Mar 2020 | Developed design basis for eccentrically loaded WT brace members, allows comparison with concentric braces |
Single angle braces vs WT braces Feb 2020 | I compare the simplicity and efficiency of single angles to WT braces |
Calculate Beta w for Single Angles Dec 2019 | The beta value for single angles is an elusive parameter. I developed a closed form solution for the beta value. |
AISC Bolt Shear — C Coefficient Jul 2019 | Here is my iPhone app for determining bolt group coefficients – with plots.
See video. |
ASCE 7-16 Kzt Calculation — with Chart Jul 2019 | Here is my iPhone app for determining the ASCE Kzt parameter.
See video. |
AISC Bolt Shear (with video) Jun 2019 | Here is my iPhone app for determining the allowable bolt shear in accordance with AISC.
Beautiful, very quick to use. |
Brom’s Method Sep 2017 | Rigid shaft foundation design |
ASCE 7-16 Ice Loading Apr 2018 | Developed function, get_iceweight()
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Wind and Fire-proofing Dec 2017 | Explicit wind calculation for steel members including fireproofed beams and columns.
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MATHEMATICS | |
Multi-Dimension Data Table using PyXLL (with video) Dec 2020 |
I coded a PyXLL macro that builds a multi-dimension data table.
The native Data Table provided by Excel is useful but limited to two variables. My version is set up for 5 dependent variables and an unlimited (theoretically) number of dependent variables. |
Excel Dropdown with NO worksheet data list (with video) Nov 2020 |
I built an Excel dropdown function — that requires no worksheet reference!
Reasoning The dropdown built into Excel requires a range of data to populate the dropdown list. This might be an appropriate situation if the spreadsheet is a one-off. In my work, the dropdown list would more appropriately be generated in my PyXLL program. Having the dropdown and its data provided by a PyXLL function allows:
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Feet Inches Sixteenths (FIS) Calculator |
I built an Excel FIS Calculator![]() Features
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DISCLAIMER
Reference on this website to any specific commercial products, process, service, manufacturer, company, or trademark does not constitute its endorsement or recommendation by Karl Hoitsma.
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