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Why do engineers build bridges and railway lines with gaps in between?
Wiki User
∙ 13y ago
Because differences in temperature cause the materials to either shrink or expand. With a lot of shrinking and expanding occurring, these materials would crack or break down if there wasn't any allowance for the movement. Also these gaps are used to compensate for the weight of the load crossing vehicles which presses the bridge to its maximum shear capacity. The gaps serve as this allowance for movement in terms of both temperature and weight.
Many railway tracks no longer make use of these gaps as they are pre-tensioned and then placed into position in this "stretched" form. Thus, as temperature rises, the tension in the tracks decreases, but the material does not buckle, since it is already stretched!!!
Wiki User
∙ 13y ago
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