Structural Analysis
For a two-hinged arch, if one of the supports settles down vertically, then the horizontal thrust

Is increased
Becomes zero
Is decreased
Remains unchanged

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Structural Analysis
The effective length of lacing is the distance

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

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