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Hold-down Offset Subtraction from Overturning Moment Arm (Bug 2731, Change 165)

The program did not subtract the hold-down offset from the moment arm when calculating overturning hold-down forces, despite the fact that O86 9.5.6.1 requires it and that the disabled checkbox in the Hold-down settings indicates that it is to be subtracted.

Since 9.5.6.1 says you should use the centre of the end stud as your hold-down offset for moment arm calculations, we now allow you to use the centre of the end wall stud assembly that you input in Wall Input View for each wall in the structure. A checkbox in the Hold-down settings is used for this. The default value is to be checked.

When drawing, the program now draws the tension side hold-down at the full stud thickness from the wall end, because it depicts the bracket, not the center of the bolt through the studs.

See Also

Worst-case Design

Wall Design Groups (Feature 17)

Highlight of Failing Walls (Feature 75)

Design Summary (Feature 138)

500mm Stud Spacing for Unblocked Factor (Feature 173)

Hold-down Force Accumulation Tolerance ( Change 169)

Non-convergence of Deflection-based Distribution to Segments (Bug 2770)

Uplift Loads on Walls with Openings (Bug 2744)

Verification of Stable Design in Final Design Check Iteration (Bug 2743)

Selection of Critical Segment in Design for Unknowns (Bug 2730)

Design for Distribution of Forces to Shearwall Segments Based on Rigidity

Output Warnings for Inadequate Stud Thickness for Hold-downs (Bug 2825)

Hold-down Stud Width for Capacity and Elongation (Bug 2826)

Levels and Directions for Out-of-Plane and Weak Storey Seismic Irregularities (Bug 2824)

NBC Terminology (Change 164)

Building Model and Program Operation