The Secret to the Truss Strength!

Exciting to make connections between my uni classes and these videos!

more about truss warren bro...

"Amazing work! As an aspiring engineer, you are a true inspiration. Your dedication and commitment to engineering excellence are truly remarkable!"

HEY!? NOTABLY THE TRUSS ALSO OFFERS LESS GEOMETRICAL MS. & YET INCREASED SURFACE AREA, HOWEVER THERE IS A WIDER GENRE OF GEOMETRICS YET TO B DISCOVERED FAVOURABLE TO SUCH FORMS!!!...

Dumb test that doesn't test what you are trying to test .

Great video. The humble bicycle frame is also a perfect truss structure. The difficulty comes when other forces intervene such as the bending force on the head tube when you apply the front brake. Carbon frame engineers have learned a lot in recent years about laying the carbon mat is such a way that maximum stiffness is achieved with minimum weight and they have also learned how to vary the carbon layup so as to allow controlled flex to prevent an over-stiff ride.

I've invented a new type of truss, I call it the "Liz Truss".

Need to retest your truss without pier failure.

The Sydney Harbor bridge has 2 train lines on its deck.

4 ft x 4 ft plywood. Drill hole in it.

Ben Franklin bridge has suspension, truss, and trains.

Try if possible to film your structural failiures in slow motion

You opened the video with the collapsed Tretten bridge. In the investigation they talked a lot about bolts possibly failing , the wood breaking etc. But I said from day one : that is NOT even a truss bridge!! All the diagonal truss beams in that bridge was LEANING THE SAME WAY. now Im not an engineer, but surely that will PROPAGATE the stress to more parts of the bridge , an not, as it should distribute the load

Thanks that was a very nice video, additionally the stiffness of the gusset plate, and bolts tightening condition allows for deformation during loading and that adds up into the explanation of pinned connection.

The Patullo Bridge in Vancouver BC has a commuter train - 'The Sky Train' - running on it. In 1990, when it opened, it was the world’s longest transit span and the world’s only cable-stayed bridge designed solely for carrying rapid transit. It held its distinction until 2019 when it was surpassed by the Egongyan Rail Transit Bridge in Chongqing, China.

"Use whatever unit you prefer he says. Mm, inch, whatever you prefer...". I'm taken aback. He doesn’t include the light year, a critical unit!

San Francisco Bay Bridge, west side is a suspension bridge built for trains

Your test was inaccurate because you had an horizontal and vertical load placed on the test subjects.
It was meant to be just vertical load facing downwards. What most bridges endure the most!
They don't have traffic driving on the walls of the bridge.

The preview pic is from a truss bridge accident in Norway. There was a suspected construction error. So all the bridges had to be checked and some were closed until checked. It is a very common bridge in Norway since it is both cost efficient and somewhat aesthetically pleasing.

Will someone please call Linda Figg CEO, president and sole owner of the FIGG Bridge Group, and tell her the secret before she designs another bridge and kills (murders) more people.

Excellent video my dude

Horrible test. Can't possibly use any of the results.

99 pounds? For a bunch of tiny sticks? That's shocking.

Check out the Ben Franklin bridge in Philadelphia. It might be an appropriate study, tho I haven’t seen or been on it in over 30 years.

If it is genuinely secret, how do you know about it ? If it isn't genuinely secret, why do you lie and call it secret?

Great video. That's amazing though how you were able to show the strength of a truss, I mean you whipped together a glued truss and it still supported nearly 100 lbs, awesome.

The Tyne Bridge at the beginning of the video has bridge beside it with a truss system with arches intergrated into the truss. This bridge has rail transport on top and motor vehicles on the lower deck.

Truss is as strong as the connection points.
A poorly executed connection point jeopardizes the strength of the truss.

Can’t believe that thin wood truss held up to so much weight. Wow.

Make a hole in the table so the weight can hang straight down

Interesting video boss.👍👍👍

Very well explained, cleared a lot of concepts. Really good job!

There is a suspension bridge with Mass Transit trains in New York City, Manhattan Bridge.

I think the NYCTA runs their trains under the city's bridges.

I think Matt needs to see this.

Shouldn't you hang the rope straight down instead of pulling from the side. It failed because of the way you tested it.

Lisbon, Portugal, 25 April Suspended Bridge, was after-built adapted to accommodate a railway underneath. It work fine, and heavily, the train is of suburban type.

15% may have been 20-40%had the simulated abutment not yealded first putting the twisting moment into the truss causing it to fail.

Thanks for the memories.
8th grade in a class called Exploring Technology, we each built and tested a bridge to failure. 10' of 1/2"×1/8" pine, a 12x4" card stock as decking, and ample wood glue. 1st place got 150lbs I got 110lbs for 2nd place. Lowest was 10lbs for essentially a beam deck bridge ,( minimal effort, no super or sub structure) my failure was down to delamination of the wood grain where the super structure notched into the main horizontal member on top of the abutment . Had we been allowed more stick out, on top of the abutment , the delam would have been prevented.
My bridge had a minimal failure 1 cracked member. 1st place was a catastrophic failure where it shattered into 100's of pices my trophy was my bridge, his was a pile of toothpicks.

25 de Abril bridge in Lisbon, Portugal is very similar to the Golden Gate in San Francisco and it carries a double track railway in the under deck.

I agree that a central principle of a truss is that all intersecting beams must intersect at a common point in order to prevent inducing a moment.
However, even if this condition is met, when the beams are attached using gusset plates and lots of pins, simple geometry implies that there MUST BE some angular deflection of the beams in order for the aggregate deflection/bending of the bridge to occur. As a consequence, the pins furthest from the intersection point will experience the greatest shear loads.
There have been bridge failures caused by failure of pinned/gusseted joints.

1st test the supports failed!

Had the test fixture been more robust, you may not have had a failure so soon. The cliff gave way and the bridge fell into the river.