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

is increased
is decreased
becomes zero
remains unchanged

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Structural Analysis
The effective length of lacing is the distance

Between the inner end rivets of the bar for single lacing
All of these
0.7 of the distance between the inner end rivets of the bar for double lacing
Between the inner ends of effective lengths of welds connecting the members

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