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Thanks everyone for your comments. I need some way to check up on Risa. "rectangular concrete tanks" suggested by Kramer is on the way. I remember seeing Dept. of the Interior, Water Resources Technical Publications, Engineering Monograph no. 27 suggested by JedClampett years ago but...

I am designing a concrete basement wall to be backfilled without support at the top, acting as a plate simply supported at the bottom by a slab and at it's ends by perpendicular walls. Using RISA-3D to analyze a plate element model I find that I can reinforce for the maximum vertical and...

Yes, Rogy is right. I think that in this context, compatibility means that the member displacements are compatible with the boundary conditions. In the case of the two span continuous beam the boundary conditions are that at each of the three supports the translation of the member is zero, but...

Why not just install the blocks flatwise? 2" nominal lumber provides enough penetration depth for design loads for 8d nails. The blocks over the plates (bird blocks) would of course be perpendicular to the rafters, drilled and screened (common practice), and may need connectors to transfer...

I think shear area means, or should mean, the effective area for shear stress i.e. the area by which you would divide the shear force to get maximun shear stress. This would be 1/1.5 for a rectangular area because the max. shear stress is 1.5 times the average shear stress.