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From:
http://www.arch.ttu.edu/courses/2011/fall/3501_Perl/students/Wright/12/Default.htm
The anonymous blogger writes:
“Catenary arches are a natural occurrence due to Earth's gravity. They form when a material is fixed at two points and allowed to hang naturally. This form is also know as a parabolic form in mathematics and occurs under precisely calculated conditions. . .”
“A catenary arch structure could be made out of precast concrete or steel tubing much like the tubes used in roller coasters or suspension bridges. The benefit of engineering a structure in steel tubing is that the vertical depth of each arch can be different. In a precast concrete arch, the construction process would benefit from the arches being similar if not identical.”
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