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Re: Fwd: Fw: Fwd: FW: Climbing To The Top Of The Mackinac Bridge

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Freeze-frame at 1:58.

William L. Polhemus, Jr. P.E.

5

> On Apr 15, 2014, at 8:49 AM, Abolhassan ASTANEH-ASL <astaneh(--nospam--at)berkeley.edu> 
> wrote: 
> Hi Daryl and thanks so much for pointing to the video of the Mackinac
> Bridge.  It was great.  But I did not see corrosion.  Would you please 
> tell me at what time during the video you see rust.  From the video it 
> seems to me the bridge is in mint condition.    Thanks.
> 
> Speaking of thrilling views, I had a chance to take my research students 
> to top of the towers of the Golden Gate Bridge , the San Francisco Oakland 
> Bay Bridge (after 1989 Loma Prieta quake) and the mother of all bridges, 
> the Akashi-Kaikyo Bridge ( the longest span in the world) after 1995 Kobe 
> quake and investigated their condition for seismic damage.  Of course after 
> doing our investigation, we stayed up there for hour or two to organize 
> our research notes and double check everything!  Right?  In the case of 
> the Bay Bridge and the Akashi Kaikyo Bridge instead of using elevators or 
> stairs  I asked to walk on the cable to top of the tower and the transportation 
> authorities agreed and we did!
> 
> The walk on the cables of the Bay Bridge was the first time and at the
> bottom of cable sag we got new construction gloves and while we were

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