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

is increased
is decreased
remains unchanged
becomes zero

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Structural Analysis
Pick up the correct statement for the web stiffeners.

Vertical stiffeners are spaced at a distance not greater than 1.5 d and not less than 0.33 d
d is the distance between flange angles or the clear distance between flanges
All of these
For horizontal stiffeners, d is the clear distance between the horizontal stiffener and the tension flange

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