Bridge structure turns downhill at an angle
This condition occurs when bridge alignment is not exact perpendicular or making some angle to crossing. The term angle of skew or skew angle is generally applied to the difference between alignments of an intermediate or end support and a line square to the longitudinal. In model testing, skewed crossings with angles up to 20 degrees showed no objectionable flow patterns. This skew is usually an intentional design choice forced by the geometry of the site, but it introduces a range of structural challenges that can cause the bridge to. Bridges crossing obstacles at a right angle in plan are more economical than skew crossings (shorter bridge).
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