大愛新聞DaAiTV_橋的省思_1_Short lifespan of bridges

橋的省思(1)Short lifespan of bridges After the landslide that covered Freeway No. 3 in Taiwan, attention has turned to the structural safety of other roads and bridges around the island. Of course, in August last year, Typhoon Morakot took down 52 of Taiwan's bridges, most of which were built in the last 20 years. The storm may have been a once-in-200-years event; but with climate change, more extreme weather conditions are likely to occur. In the first of a new series, we look into a possible solution to rehabilitating Taiwan's broken bridges. Typhoon Morakot wrecked 52 bridges Swept away by Typhoon Morakot, Shuangyuan Bridge has been replaced by a temporary red bridge. The storm, which hit southern Taiwan in August 2009, created raging flood waters of 27000 cubic meters a second. A total of 52 bridges were destroyed or damaged, most of which were along the Gaoping River and its tributaries. Many of the structures were less than 20 years old. Whether they were structurally sound or not, they stood no chance. Climate change, extreme weather, and the geographical features of Taiwan, make bridge-building on the island a growing challenge. NCU Department of Engineering, Prof. Cai Junyi: "The main feature of Taiwan's rivers is erosion, sediment, and landslides. Currently this is the most difficult design problem - especially the force of landslides, which is difficult to predict." Falling riverbeds weaken bridges Erosion, silt, and rockslides are the main causes of bridge ...



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