Structural Analysis
For a symmetrical two hinged parabolic arch, if one of the supports settles horizontally, then the horizontal thrust

becomes zero
is decreased
is increased
remains unchanged

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Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

5 mm more than nominal maximum size of the coarse aggregate
The diameter of the bar if their diameters are same
Greatest value of the above
The diameter of the longer bar if their diameters are unequal

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