post your pictures of bridges

San Diego–Coronado Bridge

Inspeqtor wrote in post #18800631
Richard,
How is it possible to "measure the expansion of the bolts"? What is the reason to need to know this information?
Thank you

Probably should have said tension, and I meant nuts, not bolts. Long time ago, but I'd take a micrometer and measure something.
Someone familiar with these type of constructions would know.
Here's that bridge

avondale87 wrote in post #18665834

There's a lot that goes on with bridges we are completely ignorant about, thankfully.
I once sat under a bridge all night to record temperature and deflection of a newly opened bridge that used post tressed beams.
Another time had to measure the underside of beams for variations due to expansion of concrete due to rust of reinforcing rods inside them.
Also measurements to check the hog of beams as they are stressed against their theoretical calculated hog

Timphoto wrote in post #18800671
Thanks! It wasn't for work, but just the opportunity to photograph from that vantage point.

There are more shots HERE of the Golden Gate. There are also some shots of the Bay Bridge when it was under construction.

The Bay Bridge was scary - the construction elevator only went to 500 feet. To get to the top there was 30 feet of scaffolding that wiggled like a belly dancer and looked like it was tied to the main structure with ribbons, and for added "fun" there was a 15 knot wind.

Those others are awesome and interesting.
Like the lane change midspan, construction photos. All of them

Thanks for posting.

Rebel Ti / 300v.
85mm f1.8.
Agfa Vista 200.

Mackinaw Bridge. 6/18

avondale87 wrote in post #18800782
There's a lot that goes on with bridges we are completely ignorant about, thankfully.

True that, but the amazing part is to see the engineering that was accomplished in the 1930's (Wikipedia tells me that the Golden Gate opened in 1937). It was designed with pencil and paper, math done by hand, I'll assume reasonably good materials but without the exhaustive QA, NDE and paperwork that is available today, and the design choices probably largely made based on one man's personal experience (as in "I used this feature on this bridge, so let's use it on this one). We do that today, of course, but then run it though solid modeling to validate the design, enjoy detailed peer review, have the work cross checked by our clients, and then check it all again. Frequency and Harmonic analysis simply wasn't available to any large extent without computers that could solve the math, and even today computer modeling is quite limited. Heck, we don't even have accurate torque wrenches today, and the equations to determine bolt stress are debated. Did they even have thread lubricants in 1937? All in all, brilliant engineering.

Cool pics; thanks for sharing 'em.

This bridge is a road in the Barberini Garden. Italy is down below, the road on the bridge is a part of the Vatican.

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Photo taken at sunset last night, this is the Agassiz-Rosedale Bridge near Vancouver British Columbia.

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By no means my best but just a crazy bridge in Houston

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Bridge on the W track in Patagonia.

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Did you ask what time?

A bit of a contrast here!

IMAGE LINK: https://flic.kr/p/2469​rYx

where in Bethlehem?