Masonry wall out of plane deflection design
The maximum relative out of plane deflection of a wall panel is compared to the limit defined by TMS 402 as part of the strength design of a masonry wall.
The deflection value is determined by comparing the total horizontal deflection at the extreme wall panel node to the deflection at the same height of an undeformed wall line between the nodes above and below the extreme node at the top and bottom of the wall panel. Deflection values for all selected service load combinations are enveloped to find a maximum value to compare to the code defined limit.
Limitations
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This check is not required for allowable stress design, as such it is not included.
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Default settings for modification factors for walls can produce conservative results for deflections under service loads. These factors can be adjusted to determine more accurate deflection values if required.
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Deflection due to eccentric axial loads are not accounted for in deflection design as this eccentricity is not modeled but rather accounted for in post-processing for design.
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This check accurately captures relative horizontal deflections between the top and bottom of a braced wall as required by TMS. This check will not accurately assess deflections at parapets or similar conditions with unsupported top wall condition for wall finishes.