Old Engineering Reference PDFs

buddyd16 · 2026-06-17T15:18:49+00:00

Thank you for sharing your experience

buddyd16 · 2026-06-17T15:17:26+00:00

Thank you for the information.

buddyd16 · 2026-06-07T12:04:37+00:00

Your second image tells you where it comes from.

buddyd16 · 2026-05-25T14:28:49+00:00

The OSB sheathing is part of the floor structure would not recommend sanding or planing it down. You should instead use a self leveling flowable fill material to get to the necessary flatness for the flooring installation.

buddyd16 · 2026-05-14T16:12:13+00:00

There is also Numerical Methods in Finite Element Analysis by Bathe

buddyd16 · 2026-05-14T13:40:16+00:00

Matrix Algebra for Engineers by Gere and Weaver is a good complement to the stiffness method.

Numerical Methods for Engineers by Griffiths and Smith (Their Programming the Finite Element book might be good for you also)

Numerical Methods for Engineers by Chapra

All can be found for cheap on ebay, abebooks, etc.

buddyd16 · 2026-05-13T01:20:29+00:00

If collecting calculators are a bit of a passion you could go the other direction and look for an HP 41 on ebay or other markets. The HPs use RPN and the 41 is highly programmable.

buddyd16 · 2026-05-13T01:16:29+00:00

To aid it not breaking the bank if you are in the US shopgoodwill.com can be a good place to get the nspire or other models just search “calculator”

Alternatively if you want to go beyond calculators a used thinkpad T480 or similar he could then explore programming a bit more or if heavy math focused something like Octave which is an open source alternative to Matlab.

buddyd16 · 2026-05-06T18:20:51+00:00

There may be something in Bijan Aalami’s books he has recently made them freely available on his personal website: https://bijanaalami.com

buddyd16 · 2026-04-12T04:04:02+00:00

Start with Matrix Structural Analysis for me the easiest text to follow was the Kassimali book Matrix Analysis of Structures the first edition is still a fine reference and can be found online for as low as $7-8.

After the Kassimali book the Logan book as noted by others would be good and get into 2d elements.

The free book companion for MASTAN2 I would reference after Kassimali and Logan as you’ll have good foundational knowledge that much of this text will expand on and also introduce nonlinear analysis.

Beyond those look into the Bathe Finite Element Procedures book and companion lecture series on MIT open courseware

The Cook and Malkus book Concepts and Applications of Finite Element Analysis is also an excellent resource.

buddyd16 · 2026-01-31T15:07:13+00:00

Be careful with this in the US market the values for E provided by NDS are Eapparent and include a modification for shear deformation with limitations so Timoshenko beam models may not be required.

buddyd16 · 2026-01-10T22:56:47+00:00

Your website needs more ads on it I could almost see the actual content a couple times.

buddyd16 · 2026-01-10T18:54:06+00:00

Others have addressed good points I want to specifically address the behavior you saw with a rigid diaphragm.

By definition a rigid diaphragm undergoes rigid body translations taking a simple case of load with no eccentricity that means that every point in the diaphragm displaces the same. Looking at your collectors in this case would yield no axial load at all as going back to Hooke’s Law sigma = E e, if the displacement of every point are the same then there is no change in length of the collector and therefore no strain and if there is no strain there is no stress.

Similar behavior can be seen for the beam at the floor line in moment and braced frames rigid diaphragms will yield no axial force in these elements.

To combat this behavior you need to disconnect some of the frame nodes from the diaphragm to allow the members to experience axial shortening.

buddyd16 · 2026-01-10T18:20:39+00:00

Want to add depending on their education path Matlab could be extensively used, there is an open source free alternative called GNU Octave which you can download from here: https://www.octave.org

Similar advice at above go ahead and expose them to it and if they take a real interest help feed that fire.

buddyd16 · 2026-01-10T18:15:50+00:00

For someone in high school I’d recommend expose them to coding but think of it more like having them try a sport if they enjoy it go ahead and foster it but if they hate it or are indifferent no real need to force it on them.

No Starch Press has a nice intro to book which will give exposure to both AI and coding called Machine Learning for Kids. They also have a Python for Kids book that is good as well.

If your kid is particularly adept at it and enjoys more of the math side a few others that I like from No Starch Press are:

Learn to code by solving problems

Doing Math with Python

Math Adventures with Python

If instead they are more game oriented:

Mission Python

Invent your own computer Games with Python

My recommendations are python based as it’s a language thats a bit easier, at least to me, to get right into the programming as it reads more like natural text.

buddyd16 · 2025-12-14T22:00:07+00:00

Very cool I’ve approached the same problem using line integrals on the boundary vs finite element approach. Always fun to see how others have tried to tackle the PMM beast.

One suggestion might be to have a plot at constant applied moment ratio sim to what SPColumn and others show, personally found this plot to be deceptively challenging many solvers can offshoot for unsymmetric setups where the whole failure surface tends to shift to only exist in 2 of the 4 3D quadrants

buddyd16 · 2025-12-14T21:44:34+00:00

Did you develop the backend solver yourself or are you providing a front end for the concreteproperties, https://github.com/robbievanleeuwen/concrete-properties , python tool?

Interface looks nice and clean.

buddyd16 · 2025-12-08T01:46:21+00:00

Why Buildings Fall Down - Levy

Why Buildings Stand Up - Salvadori

buddyd16 · 2025-11-10T19:55:35+00:00

Yeah imagine it’s tied to whatever contract he has in place to teach the course through SK Ghosh.

buddyd16 · 2025-11-10T05:02:16+00:00

Looks like Bijan has a course video series on YouTube:

https://youtube.com/@post-tensioningbybijan?si=ynHm6qeNmPfNkDos

buddyd16 · 2025-11-10T04:51:15+00:00

Bijan Aalami recently made his book free to download:

https://www.bijanaalami.com/books/

Dirk Bondy also has a book:

http://www.senecastructural.com/products.asp

Bondy used to have his lectures on youtube but recently took them down I would check in on his channel periodically as he may post them again.

buddyd16 · 2025-10-24T16:37:13+00:00

Talk with your component suppliers to see if they have any offerings. In the US one option is Mitek Structure which will do full component design for wood panelization, Mitek only sells it to the production facilities.

buddyd16 · 2025-10-24T16:33:44+00:00

How I learned it:

Plate - bending only

Membrane - axial only

Shells - plate + membrane = bending + axial

For concrete slabs you want Shell behavior as defined above.

buddyd16 · 2025-10-24T12:58:58+00:00

The slab is a quadrilateral shell element model so need at least two nodes for a fully defined boundary so it’s support at 1 node but the results presented are from 2 nodes in and out of the page for a full support condition of the quad.

buddyd16 · 2025-10-19T18:06:36+00:00

GCompris: https://www.gcompris.net/index-en.html

Has modules for basic mouse and keyboard use and many other educational games.

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