A Lashed-Plus-Bolted Bamboo–Timber Joint for Low-Rise Housing: Connector Design and a Computed Shear, Pull-Out and Slip Budget Across Culm Diameter and Moisture

SIMULATED, NOT MEASURED. This paper specifies a bamboo-timber composite floor/roof joint for low-rise housing — one M12 through-bolt with 50 x 50 x 3 mm washer plates, placed 120 mm from the culm end, plus six turns of pretensioned fibre-rope lashing to a 40 mm timber ledger — and computes its full load budget (shear, pull-out and slip) for culm diameters of 80, 100, 120 and 140 mm and moisture contents of 8, 12, 16 and 20 percent. At the recommended 120 mm culm at 12 percent moisture, design shear capacity is 8.29 kN (2.96 times a stated 2.8 kN demand), design pull-out capacity is 7.93 kN (4.17 times a stated 1.9 kN uplift demand), slip at a 3.0 kN service load is 0.75 mm, and cost is US$4.63 per joint, 50.7 percent below a stated US$9.40 steel bracket comparator. All sixteen diameter-moisture combinations pass in simulation, and failure is ordered so that reversible slip and ductile bearing precede brittle shear-out. All numbers come from the accompanying computation script. No joint was built or load-tested. AI use disclosed: Dave, an AI assistant, performed the calculations, drafting and deposit preparation under the author's direction.