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Baltimore Bridge Collapse
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<blockquote data-quote="MODAT7" data-source="post: 256747" data-attributes="member: 13649"><p>News today confirmed the ship lost power. No power, no steering. At least they had time to put out a distress call so the bridge could be closed. I'm unsure why those 8 bridge workers weren't also evacuated. 6 appear to have been killed and lost as of right now.</p><p></p><p>Most large ships have some kind of backup system for steering. It's unclear why that didn't work. Some ships have an emergency drop anchor function that could have been used. That would be somewhat drastic on the ship's frame, but it might have stopped it or slowed it down enough that the bridge damage would have been minimal. If there are power and data cables across the river, the anchor would snag on these and cut them. It still would have been cheaper than building a new bridge. The official investigation over the next year will look into these questions.</p><p></p><p>The Science Channel has a program called "Engineering Disasters" that I'll sometimes watch. This, by far, isn't the first freighter and bridge collision. A major one seems to happen every 5-10 years all over the planet.</p><p></p><p>There are 2 general types of bridge designs. 1) A failure in one part can be born by the rest of the bridge. These are more expensive to build. 2) A failure in one part is catastrophic to the entire bridge. These are cheaper to build and far more common. This is that bridge in Baltimore.</p><p></p><p>The recommended solution for all the bridges in the show was to put those giant concrete bumpers before critical supports of the impacted bridge. If that Baltimore bridge would have had these, this story would have been minor. Needless to say, the rebuilt bridge in a couple years will have them. In hind sight, it would have been far cheaper to add the bumpers than to pay for a new bridge and the lives lost. The loss of business to the main port beyond the bridge while the bridge is in the water will also be substantial, maybe enough to pay for the bumpers a couple times over. For a major port, an engineer really screwed up by not including them.</p></blockquote><p></p>
[QUOTE="MODAT7, post: 256747, member: 13649"] News today confirmed the ship lost power. No power, no steering. At least they had time to put out a distress call so the bridge could be closed. I'm unsure why those 8 bridge workers weren't also evacuated. 6 appear to have been killed and lost as of right now. Most large ships have some kind of backup system for steering. It's unclear why that didn't work. Some ships have an emergency drop anchor function that could have been used. That would be somewhat drastic on the ship's frame, but it might have stopped it or slowed it down enough that the bridge damage would have been minimal. If there are power and data cables across the river, the anchor would snag on these and cut them. It still would have been cheaper than building a new bridge. The official investigation over the next year will look into these questions. The Science Channel has a program called "Engineering Disasters" that I'll sometimes watch. This, by far, isn't the first freighter and bridge collision. A major one seems to happen every 5-10 years all over the planet. There are 2 general types of bridge designs. 1) A failure in one part can be born by the rest of the bridge. These are more expensive to build. 2) A failure in one part is catastrophic to the entire bridge. These are cheaper to build and far more common. This is that bridge in Baltimore. The recommended solution for all the bridges in the show was to put those giant concrete bumpers before critical supports of the impacted bridge. If that Baltimore bridge would have had these, this story would have been minor. Needless to say, the rebuilt bridge in a couple years will have them. In hind sight, it would have been far cheaper to add the bumpers than to pay for a new bridge and the lives lost. The loss of business to the main port beyond the bridge while the bridge is in the water will also be substantial, maybe enough to pay for the bumpers a couple times over. For a major port, an engineer really screwed up by not including them. [/QUOTE]
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