Recent Topics
Valve issues
by kawie_guy. 09/21/18 01:54 PM
2018 Elantra SE
by wolf_06. 09/21/18 01:36 PM
Nasty looking oil filter
by atikovi. 09/21/18 12:43 PM
Laughing hard.
by StevieC. 09/21/18 12:26 PM
Apologies
by Drew99GT. 09/21/18 12:15 PM
Would Like the Manual Transmission to Make a Comeback?
by Speak2Mountain. 09/21/18 11:39 AM
Leaf Mulcher
by kwijibo. 09/21/18 11:32 AM
Pizza dough too crusty
by zorobabel. 09/21/18 11:26 AM
Lubegard Red or Platinum
by diyjake. 09/21/18 11:01 AM
Storing Car Outside
by Delta. 09/21/18 10:47 AM
Looking at a cheap commuter!
by ryan2022. 09/21/18 09:46 AM
Does Your 3.5EB Make Oil
by Gene K. 09/21/18 09:07 AM
F150 Front Differential
by hatt. 09/21/18 08:45 AM
EU version of Subaru 2.5 FB engine
by IMPALA08. 09/21/18 08:40 AM
New “rules” changing your choice of car?
by daves87rs. 09/21/18 06:04 AM
WIX51334XP Oil Filters
by CB900F2. 09/21/18 05:14 AM
Signal Oil Company radio advertising
by 21Rouge. 09/21/18 04:07 AM
Anyone "Wim Hof"ing ?
by Shannow. 09/21/18 02:35 AM
Newest Members
ScottRousell, Direct_Rejection, donatom, Sylent_Snyper, Ajizzle
66034 Registered Users
Who's Online Now
101 registered members (andyd, 853okg, 2010Civic, 14Accent, Al, 9 invisible), 1,808 guests, and 42 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics290,766
Posts4,849,983
Members66,034
Most Online3,590
Jan 24th, 2017
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Hybrid Composite Beams - aka people are clever #4587165
11/28/17 04:02 AM
11/28/17 04:02 AM
Joined: Dec 2002
Posts: 40,860
'Stralia
Shannow Offline OP
Shannow  Offline OP
Joined: Dec 2002
Posts: 40,860
'Stralia
Dunno if any of you remember some of the discussions on concrete design where I explained that you always consider the concrete on the tensile side to be broken, and the only things holding the tension are the reinforcing ?

The concrete itself can handle compressive loads without the reinforcing.

Clearly somebody who does some thinking though well why put all that heavy concrete on the side that's considered broken anyway, and just add to the load on eht bridge with useless broken concrete...



That's clever.

Re: Hybrid Composite Beams - aka people are clever [Re: Shannow] #4587172
11/28/17 04:35 AM
11/28/17 04:35 AM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
John Hillman the engineer that developed that composite beam used ideas and methods developed by French bridge engineers. The composite beam is an example of taking great engineering and making it better. Maybe Hillman's beams can be used to rebuild all the US bridges that are falling apart or getting condemned. The savings in construction time and concrete alone should help pay for the job. Our politicians have to just stop running off with the road tax money that's supposed to be used to maintain the roads and bridges.

Re: Hybrid Composite Beams - aka people are clever [Re: Shannow] #4587174
11/28/17 04:43 AM
11/28/17 04:43 AM
Joined: Jan 2003
Posts: 3,203
Southeastern, PA
Rick in PA Offline
Rick in PA  Offline
Joined: Jan 2003
Posts: 3,203
Southeastern, PA
We use to have a local company, I think their name was Eastern Prestressed Concrete, that made prestressed beams. They made long beams with embedded steel reinforcement in the lower area of the beam. During casting of the concrete, the steel would be put under great tension. In service the concrete would mostly be in compression. I remember seeing these beams being trucked out of the facility on tractor trailers that could be extended in length. There would be flag cars before and after these oversized loads. It was quite a process.

Once, I met a fellow who worked there. He said every once in a while they'd have a bad beam. What to do? They took them out back, bulldozed a trench and buried it. I wonder if some future owner of the site is in for a surprise when they find a bunch of huge concrete beams buried in the ground.


A wise man told me:
"Heat is your friend." and "Any oil is better than no oil."
Re: Hybrid Composite Beams - aka people are clever [Re: Shannow] #4587179
11/28/17 05:13 AM
11/28/17 05:13 AM
Joined: Dec 2002
Posts: 40,860
'Stralia
Shannow Offline OP
Shannow  Offline OP
Joined: Dec 2002
Posts: 40,860
'Stralia
Yep, pre-stressed concrete taken to the next level...no concrete at all in the lower tensile section

Re: Hybrid Composite Beams - aka people are clever [Re: Shannow] #4587250
11/28/17 08:16 AM
11/28/17 08:16 AM
Joined: Sep 2004
Posts: 7,525
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,525
Marshfield , MA
I worked in a pre-stressed plant for a while. You really don't want to be around when a cable lets go.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

BOB IS THE OIL GUY® Powered by UBB.threads™