Indeterminate truss models are proposed for the analysis of low-rise walls
retrofitted using a special system of vertical and diagonal steel strips. A
n equilibrium diagram is also presented to calculate the ultimate strength
of walls based on a lower bound theorem of plasticity. Step-by step analyse
s were conducted to establish force-displacement relationships of wails tha
t compared well with those obtained experimentally. A simple retrofit desig
n procedure is formulated and illustrated using a numerical example.