"If you calculate the load on a suspension bridge and its distribution, the Shear force and Bending moment diagrams will yield equations for design.... these equations in case of a suspension bridge have degree=2... therefore it becomes a second degree curve, i.e. Parabola...( for. eg. y = k.x^2) A catenary is not a second degree curve... it is an exponential one and hence cannot be used."
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