Share Pics of People Hauling or Towing Something Wrong

[4570Man]

Think of the wind load a big sign like that would take with a 50MPH gust in a storm.

Not anything close to a dump truck crashing into it.

 

[Fallon]

Not anything close to a dump truck crashing into it.

How to Calculate Wind Loads From Wind Speeds | Sciencing talks about wind loading for 100mph of wind at around 50lbs per square foot. On a 10'x12' wall being a little over 6,000lbs. Similar ballpark size & force to a sign maybe. That's 3 tons of force, which is a lot in some contexts, but probably not this one.

Go to the car crash force calculator at Car Crash - Impact Force Calculator - Omni & plug in 60mph & 10 tons & you get a resulting force of 18,340,645lbs or almost 10,000 tons. Not sure how accurate that is, but the force of a 10 ton truck at freeway speeds if going to be way more than 10 tons.

So even if the sign is a lot bigger & designed for more force, it's still going to be designed for a wind load less than a speeding truck. Although there is a pretty decent chance they do design the supports to not fall over & injure/kill innocent people when hit by a truck.

 

[aczlan]

How to Calculate Wind Loads From Wind Speeds | Sciencing talks about wind loading for 100mph of wind at around 50lbs per square foot. On a 10'x12' wall being a little over 6,000lbs. Similar ballpark size & force to a sign maybe. That's 3 tons of force, which is a lot in some contexts, but probably not this one.

Go to the car crash force calculator at Car Crash - Impact Force Calculator - Omni & plug in 60mph & 10 tons & you get a resulting force of 18,340,645lbs or almost 10,000 tons. Not sure how accurate that is, but the force of a 10 ton truck at freeway speeds if going to be way more than 10 tons.

So even if the sign is a lot bigger & designed for more force, it's still going to be designed for a wind load less than a speeding truck. Although there is a pretty decent chance they do design the supports to not fall over & injure/kill innocent people when hit by a truck.

The sign post appears to be tilted and it looks like the top of the "roof" over the cab is pushing up on the bottom of the sign.

My guess would be that the top of the "roof" hit up near the bottom of the crossbar that the sign mounts to.

Aaron Z

 

[California]

That's a heck of a load going up a steep and long hill. It was a steady 6-7 mph all the way.View attachment 641478

Am I seeing things here??? It looks like his lead drive axle is off the ground.

 

[4570Man]

Am I seeing things here??? It looks like his lead drive axle is off the ground.

It’s probably got 3 tandems and that’s an air drop axel.

 

[Rock Crawler]

It’s probably got 3 tandems and that’s an air drop axel.

Nope, he has 2 drive axles, 1 in the ground and one held up.

 

[oliver1555]

If you look closely, you will see he is running on snow to make that turn. Kind of an optical illusion. Both drive axles are on the ground.

 

[duramaxsky]

If it's legal on 6 axles it's not that heavy. Maybe 50,000 pounds. In WA that truck could only weigh 96,000 gross.105,500 is normal here for any 7 or 8 axle truck.

 

[aczlan]

If it's legal on 6 axles it's not that heavy. Maybe 50,000 pounds. In WA that truck could only weigh 96,000 gross.105,500 is normal here for any 7 or 8 axle truck.

If its a Cat 740 (it looks almost identical to this 2002 740: https://www.machinerytrader.com/lis...pment/for-sale/33883877/2002-cat-740?CTRY=USA ), it would weigh 74,000-76,000# empty.

Aaron Z

 

[aczlan]

If you look closely, you will see he is running on snow to make that turn. Kind of an optical illusion. Both drive axles are on the ground.

Looking at this picture:

It sure looks like the lead axle is off the ground and hitting the top of the fender.

Aaron Z