TPO60听力Lecture2原文+MP3+题目+答案下载

TPO60听力Lecture2原文+MP3+题目+答案下载

TPO60听力Lecture2原文：

listen to part of a lecture in an engineering class.

we've been looking at some engineering challenges of the past few decades, how engineers have to consider special demands like a budget and time constraints when they're designing buildings and other structures. today, we're gonna focus on environmental challenges, problems engineers face from the great outdoors. uh, what comes to mind? Alice? well, if you're designing building, you'd have to see what kind of soil or rocks you're dealing with. good. um. What else? Mike?

Well, weather conditions, ok, uh, go on like in a desert, the heat, the dry climate would probably affect the materials for the structure, even the design. Okay. now, a really good example of this, a Challenge it took until the 1990s to figure out how to deal with is a bridge up in Canada called the confederation bridge. This is a. long winding bridge. standing a width of, but here you can see it on this slide. the confederation bridge connects Prince edward island, which is off the eastern coast of Canada to the mainland, and it has to cross a body of water 8 miles wide. The northumberland strait now this straight has some of the harshest weather conditions in Canada. talk about challenges for an engineer. Ice wind, incredible cold. I grew up on Prince edward island. I should know every time we take that ferry, it was the only way to cross back then. there were long lines. is just to get on and. the ride was long. the schedule. cool and reliable. because of ice and winds. uh, Mike, you a puzzle? Yeah, I don't get it.

Why'd it take so long for them to build this bridge? I mean, sure, it's called up in Canada and all but well, I remember some pictures in our book of bridges up in northern europe where it's probably even colder than Canada. ah, and they were built much earlier than the 1990s. Well, well remember, temperature is just part of the picture. You've got cold, icy winds. over a lot of water along long. stretch of freezing. water, uh, it's not the longest bridge in the world. Well, its longest in Canada, but it is the longest bridge. anywhere over. for that freezes. so this means you've got ice, huge masses of ice, and this ice goes floating down the straight and it has to get through. so why is this a problem? Well, we've got a look at how most bridges like those european bridges you mentioned probably are supported. remember when we. look at basic bridged. design earlier in the year. what was the basic shape of the piers? The supports for these bridges with long spans? yeah, well, they're like these columns, a row of cylinder shapes like columns supporting the span of the bridge. okay, now think about it with these basic columns.

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