Analysis and design of low-rise masonry and concrete walls retrofitted using steel strips

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