A Confined-Masonry Wall System for One-Storey Stabilised-Earth Housing: Tie-Column and Ring-Beam Layout with a Computed Seismic Shear and Stability Budget

A complete confined-masonry wall system is specified for a one-storey house of 7.2 m by 4.8 m plan and 2.7 m wall height in 140 mm stabilised-earth block (masonry compressive strength 1.90 MPa, seismic weight 182.22 kN): reinforced-concrete tie-columns 150 mm by 140 mm at every corner, wall end and intersection and at no more than 2.4 m spacing (10 columns), with a continuous 150 mm deep ring beam at wall top. Under a simplified equivalent-static computation (in-plane coefficient 1.80, out-of-plane coefficient 1.50), five checks are evaluated across ground accelerations of 0.10 g to 0.40 g: in-plane shear in each direction, out-of-plane bending of the four-side-supported panels, drift against a stated 0.40% limit, global overturning, and toe compression. The design envelope ends at 0.291 g, set by in-plane shear of the short walls (capacity 0.0811 MPa); at 0.25 g the largest utilisation is 0.859. Out-of-plane bending at 2.4 m spacing reaches its limit at 0.344 g, 2.01 times the 0.171 g limit of an otherwise identical unconfined panel, while 3.0 m spacing would lower it to 0.277 g and make it govern. Drift at the envelope end is 0.0419% against the 0.40% limit. All results are simulated, not measured; no wall has been built or load-tested, and the values are not a safety certification. Computations are reproducible from the deposited compute.py and results.json.