What is the effective spring constant or

coefficient for this structure in units of $k\frac{N}{m}m$

where $k1=10k\frac{N}{m}m$ and $k2=10k\frac{N}{m}m?$

Please assume the vertical bars are spaced

symmetrically, the horizontal beams are rigid

and non$-$rotating, and the vertical bars are

deformable in the vertical direction.