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Re: Load Capacity of a Holddown Post as a Compression Member

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"Nels Roselund, SE" <njineer(--nospam--at)> wrote:
Is there a rational way to determine the design capacity of a compression member in which the applied load increases linearly along its length from zero at one end to a maximum at the other end, as for a shearwall holddown the end of a shear wall?  I assume that the capacity would be greater than if the load is applied in end bearing each end.
Nels Roselund
Structural Engineer
South San Gabriel, CA

If you're looking for the critical (buckling) load, you're looking for the answers in Table 34, case 3c of Roark's. All four common end fixities are given (fixed/pinned combinations), and coefficients for Euler's formula are provided to adjust for the variable application of axial force.

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