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a three-hinged parabolic arch of span 12 m has its abutments at depths 4 m and 9 m below the crown. find the horizontal thrust is the arch carries a load of 100kN at crown?

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a three-hinged parabolic arch of span 12 m has its abutments at depths 4 m and 9 m below the crown. find the horizontal thrust is the arch carries a load of 100kN at crown?
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