![]() As we'll dig into on the upcoming pages, different bridges prefer to handle these stressors in different ways. In transferring force, a design moves stress from an area of weakness to an area of strength. Using MIDAS finite element software, a suspender tensioning scheme is formulated based on a combination method of the unstrained state method and graded tension method (the USGT method), in which a suspender is tensioned according to its unstrained length. It's the difference in, say, eating one chocolate cupcake every day for a week and eating seven cupcakes in a single afternoon. With dissipation, the design allows the force to be spread out evenly over a greater area, so that no one spot bears the concentrated brunt of it. The best way to deal with these powerful forces is to either dissipate them or transfer them. Snapping is what happens when tension surpasses an object's ability to handle the lengthening force. ![]() It's the job of the bridge design to handle these forces without buckling or snapping.īuckling occurs when compression overcomes an object's ability to endure that force. Compressional stress, therefore, is the opposite of tensional stress.Ĭompression and tension are present in all bridges, and as illustrated, they are both capable of damaging part of the bridge as varying load weights and other forces act on the structure. ![]() Compression: What happens when you push down on a spring and collapse it? You compress it, and by squishing it, you shorten its length. ![]()
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