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

Remains unchanged
Is decreased
Becomes zero
Is increased

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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
0.7 of the distance between the inner end rivets of the bar for double lacing
Between the inner end rivets of the bar for single lacing
All of these

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