Adam Lohonyai

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39 followers

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**Geometry of Joist Bridging**

If you look at typical wood floor framing, you will often see rows of

cross-bridging between the floor joists. The bridging helps prevent

joists from twisting when they're loaded. It also helps make sure

concentrated loads are shared between multiple joi...

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**Another Three Cones and a Sphere**

In my previous post I solved a geometry problem involving three cones and a sphere . This time, I solve the same problem, with one small difference: the bottom of the sphere is above the elevation of the base of the cone. What is the sphere's radius, R_sphe...

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**Three Cones and a Sphere**

Three identical cones with radius R _ cone and height h are placed such that the circular bases touch one another (i.e. are mutually tangent). A sphere is then placed in the space between the cones. The sphere is touching the ground and all three cones, and...

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**Deconstructing Construction Vibrations**

Ground vibrations can come from a large number of different sources, such as rail and vehicular traffic, jackhammering, bulldozing, pavement milling, vibratory compaction, pile driving, and blasting. The magnitude of these vibrations can vary from being im...

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**For a Few Birthdays More**

Okay, maybe it CAN be worse than Paint Your Wagon . It's that time again. Time to solve some math problem involving birthdays. I've previously solved the Classic Birthday Problem , as well as the Near-Match , First Match (and First Near-Match), Same Birthda...

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**Masonry Patterns**

T he

simplest and most common patterns in modern masonry construction are running

bond and stack bond. In running bond, masonry units in one course are centred

over the head joints in the course below. As any child who’s experimented with

blocks knows, this...

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**The Generalized Egg Drop Problem**

The

original puzzle goes something like this: You have some identical eggs and a

100-storey building. You do not know what is the highest floor one can drop an

egg from without breaking it, but for some reason you need to find out. What is

the minimum numbe...

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**Olympic Champions vs. the Average Joe in Track & Field**

Bill Murray tweeted that every Olympic event should include an average person competing for reference, so I decided to try and find out what that might look like (at least for the track and field events). Track and field results that I could use to determin...

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**Making America Great?**

Here are some of the things Donald Trump thinks will make America great: A massive wall along the Mexico-US border that will likely be both ecologically devastating and largely ineffective in eliminating smuggling and illegal border crossings. Because bord...

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**SQA Higher Mathematics Examination 2015 (Part Two)**

This past year, the Scottish Qualifications Authority rolled out a new Higher Mathematics Examination, a test many high school students take to demonstrate they have an acceptable grasp of mathematics to be admitted to university. There are similar examin...

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