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The program performs the design check for hold-down capacity at each wall or opening end. This is only a design check on a hold-down selected for the hold-down location. The program does not cycle through various possibilities to find a hold-down with sufficient capacity.
Vertical elements
There is currently no mechanism for entering hold-downs at the base of vertical elements transferring a force from an upper story via a vertical element to a location on a lower story that is not a wall or opening end on that story, so there no hold-down design for those hold-down locations.
Design Cases
For each design case (wind, seismic, and both force directions), the program checks the capacity of the hold-downs at each hold-down location against the combined factored uplift force. It is ASD force and ASD capacity that is used.
Hold-down Design Table
There is a separate Hold-down Design table for each of the wind, seismic, rigid and flexible diaphragm cases. This table includes the following design information.
Hold-down
The name of the hold-down connection from the database used at hold-down location.
Combined Force
The factored components and the combined force are shown. The components shown are
The combined force is the summation of these forces. It can also possibly contain
Capacity
The ASD capacity of the hold-down at the location.
Crit Resp.
The ratio of combined, factored hold-down force to capacity. A value greater than one indicates a failed design.
Design Summary
A list of any failed hold-downs for any of the design cases, and the walls they are found in, is shown in the Design Summary page of the Design Results output